GE AK-2A-50, AK-3A-50, AK-3-50S, AK-3A-50S, AK-2-75 Maintenance Manual

MAINTENANCE

LOW-VOLTAGE

..

-POWER

MANUAL

CIR.CUil

BREAKERS

'

GEK

-l

798A

Supersedes

GEH GEH-1799 GEH-1823A GEI-50210A

-7303B ·

GEI-50211 GEI-50212A GEI-67077 GEI-74600

.

·

AK-2/3/2A/3A-50/50S AK-2/3

AK.:2/3 /2A/3A.;.1QO /100S

/2A/3A-7 5 /7

5S

TYPES

AKT-2/3/50/SOS

AKU-2/3/2A/3A-50/

AKF-2C/2D/2E

_

SOS

:.

.)

GENERAL

f/j

ELECTRIC

INTR

ODU

CTION •••••••••••••••••••••••••••

CONTENTS

••

: •••••••••••••••••

••••

•••••••••••••••

~

••••••••••••••••••

••

3

OPERATION ••••••••••••••••••••••••••••••• · •••••••••••••• ~ •••••••••••••••

MA.NUAL

· MANUAL MA.INTENANCE CLOSING

ELECTRICAL CLOSING •• : •••

~tJICIC CLOSE

E

LECTRICAL

MAINTENA

INSERTING IN

SPECTION ••• TROUBLE LUBRICATION •••••••••••• S

EPARATION

..

· BASIC

ELECTRICAL

BREAKER

ARC

POLE

.

OPERATING QUICIC

AUXILIA.RY SWITCH •••• ~· ••• ; ••

·CLOSIN'G SWITCH ••••••••••••••••••••

CUT-OFF CON

PROTECTIVE

STATIC INS

TANTANE lJND~R\TC>l,1'J\CiE DffiECT-ACT S

ERIES

SERIES

REVERSE CURRENT: POWER SEN S

ELECTIVE

CLO

SING •••••••••

FOR

ELECTRICAL

TRIPPING

NCE ••• ~ ••••••••••••••••

SAFETY

•••••••••••••••••

SHOOTING~ ••••••••••••••••••••••••

OF

QUENCHERS.

UNIT ASSEMBLY •••••••

CLO

TROL

COMPO

MECHANIS

SE

BREAKE

-CLOSING DEVICES

SWITCHES •••

RELAY

DEViCES ••••••••••••

TIME

OVER OVERCURRENT

DELAY

dus·uNDER ING

CURRENT

SOR

TRIPPING

PIN-AIC-50,

FRO

NT AND

NEN

: •••••••••••••• ~ ••

••• ~ •• : ••••

UNDERVOLTAGE

LOCICC>l.J'I'

TRIPP

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VOLTAGE

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ING DEV

TRIPP

ING

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OF

ELECTRICAL

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BREAKERS

••••••• · •••••••••••••••••••••••••••••••••• ; •••••••••••

AIC-

75

•••

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ING

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ING.

DEVICE

................................

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•••••••••••

CONTROLS ••••

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TRIPP

ICE-EC-lB ••••

DEVI

DEVICE EC-2/EC-2

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AND A

•••

TRIIPING DEVI

(AIC-50 ON

K-100

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23 25 25

26

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BREAKER

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Th.ue ins

contingency

or

should

be

particul

referred

PRIMA.RY D1SCONN'EC1'S ••••••••

SECONDARY

DRAWOUT MECHANISMS ••

~

SHUNT

~ELL

OPEN FUSE

1'()()1'8 •••••••••••••••••••• •••••••••••••••••••••••••••••

RENEW AL

lrvctiom do· not

to

ACCESSORIES ••••••••••••••

DISCONN'ECTS ••

be

t

he

ar

TRIPPING

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met

in

connection.

problems

General

PART

purpori

Electric

DEVICE

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~ipment

maintenance. Should

purchaser

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42 42 42

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47 47 47

be

desired

LOW-VOLTAGE POWER

CIRCU~T

BREAKERS

-·

TYPES

The aid and Power

designs designs extensions clature

instructions

in

the

accessories

Circuit

The

basic

have

for

including

AK-2-50, AK-2 - 75 standard mounting equipment.

AK-2A- 50, AK-2A-75, · AK-2A-100 - The A AKD-5 type equipment.

AK-2-50S, AK-2-75S, AK-2-lOOS indicates close times

AKU-2-50- fuse

AKF-2C, AKF-2D, AKF-2E . - Are

switches of

. AK-2-50H -

.

rupting 75,000

AK

the to

AKT-2- 50 continuous

AK-3-50, indicates Power

. AK•SO ,

INTRODUCTION

maintenance and

contained

for

AK-50-75-100 Low Voltage

Breakers.

AK_.50,

been

specific

have

AK-75

expanded

applications.

caused

the

following:

design

or

for

indicates

it

.has_mounting.

breaker

mechanism

of

approximately 5

..

The

breaker

combination:

for

use in.controlling

synchronous

.The

rating

has -been

amp. class.

-2- 50C,-

AK~2-75C-

interrupting

the

rno,ooo

amp.

The

rating AK-3-75,

the

breaker

Sensor

OVercurrent

herein

repair

and

variations

or

of

breaker

drawout

is

equipped with a quick-

· which

u.

indicates

m~tQ~s and

H Indicates the inter-

. · , _ ·

-

:..

rating

class

· T

indicates

of 2000

AK-3-100 - The 3

ls

AK-100

.

are

of

· AK -100

to

AK-2 - 100 -

use

provides

cycles

increased

The C indicates

has

. .

amps.

equippe!i with the

intended to

basic

breakers

·

include

These

in

the nomen-

for

stationary

in

AKD type

features

(.08 seconds)

an

shunffields generators.

been

increased

incr~ased. · ·

Trip

breaker

special

design

Basic

The

closing

internal

to the

Device.

fie

for

S

ld

AKF-2C,

;

For to ING

a

the

section

THE BREAKER AK-50 and STORED ENERGY under

OPERA TING

-'"'

o<:>

a:<(

1-1-

%-'

oo

u>

® •

~

,1,

..

F&G

· + •

SIMPLIFIED ELEMENTARY

INTERNAL WIRING

AKF -

2D,

OPERATION

MANUAL

description

of

these

section

MECHANISMS.

4'

G G

,fl

LE

GEND

CLOSING

• RELAY

• RELAY CONTACT

• MECHANICALLY

COIL

NOR

MALLY OPEN SWITCH CONTACTS

I • NORMALLY CLOSED SWITCH

L •

AUXILIAAY

AK_:50,

.r

r

"

CLOSING

of manual closing,

instructions

MANUALLY

entitled AK-50-75" AND-100

MANUAL

MOTOR

OPfRATED

SWITCH

CONTACT

DIAGRAM

75,

AND

Fig;l.

lOSING

-

SWITCH

I T ' l

I • I

G

h;

G

l

AKF-2E

entitled

OPERATED

MECHANISM,

-,--

"

E

I

1

:~TRIP

1

I

'

[.

.

1

0

CLOSING

SWITCH

--::-~J

REMOTE

CLOSE

.x

.

SWITQIES

COffTAC_!S

100

·

1

l'l£

MOTE

OSE

w

refer

CLOS

both

..

OIL .

-

AK-2has two

50X

very

or

previously

When contacting .

to

furnish

the

- -

The

special

more . of

described.

the

complete

x·

indicates

features

the

design

factory'

nameplate

the -breaker

or

it

extensions

- .it

is

important

· information.

"includes_ ·

~C

:

( -

r

tG:

j :

~

=~'l::.W&

<j,

-

'f'

-

INT(~l~.lf1~GC~fi~nt~~~U:icR

LEGEND

~'fc,~l'i,\

ii

t~~

ANTI-PUMP

fo~lTACTS

A£lAT

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https://manualmachine.com/r,:ti~~~~Wc\O.,l~lt>f:S

~~~~1s?ct•r COi

i~'i.1.~

t.ORMAllT

OptN

NORMAU.T

ClOS(O

Fig.

l ~TACT:, SWITCH

SWITCH

lA.

CONTACTS

GE;K-730~

Low

Voltage

Power

Circuit

Breakers

MANUAL

- .

~

CLOSING

· An electrical

breaker

MAINTENANCE

OF

ELECTRICAL

BREAKE~S

may be closed manually

by _ means of the maintenance handle furnished

'with the

· out discharged, proceed

breaker.

To

observe

power, with the

1. · Charge the· closing

te~ance

tor

2. Continue to until the

3.

Open. ·the

· _·button (4,

The -electrical

~e

operation of the

break~r

as

follows:

han~e

rea~

(1,

"charged": .

operate

breaker

close~.

breaker

"

F~1t.

2)~

ELlCl'.RICAL

c ontrol s·ystem ·

·

breaker

open and

spring

Fig.

with tbe main~

3) until the indica-

with- ·

springs

the.maintenance handle

by . pushing· the

trip

. . .

CLOSIN~

is

comprised of- an- X relay, two double _contact mechanically operated switch the voltage

closing s'ignal

switches (F anq G), a push outton closing

and _any means

user

may incorporate into the

is . .first

. applied to the

is

for

remote closing which

breaker,

given) the motor

system.

When

(before any

is

energized

through two of the X relay contacts and the two

a

·.

switch

the closing springs to the

at

which point the mechanically operated F and G

switc~es

·

contacts.· The-.motor then

"pre-charged"

are

ope_

rated.

This ope_

ns

compresses

position

the G contacts, stop~mg the motor, and closes the F contacts, whicp readies breaker signals ·for e~ergized, operating the X contacts. This

·

in and

the

system

for

.. When the push button

a closing operation, the X relay coil

the X relay

tl?,e

closing operation

and energizes the.motor once again

QUt:CK CLOS.E

FOR ELECTRICAL BREAKERS

the. actual closing of the

~r

remote switch ·

seals

takes

place. . .

. Functionally, the ·quick close mechanism differs

from

the

standard

pre-charge

charge

the closing ing oper~tion, a

latch

plate

electrical

operation

is

extended · to completely

springs.

w~ch

takes approximately 5 seconds,

engages the prop

mecbanism

At

the end of the

roller

in

that

charg-

to

prevent

_ the closing springs from discharging. .

the

. With breaker release plished

.

lever the

on. the

remote

. the prop

close stan~ard

·

the

·

Wi~

. control voltage appli~d, :the motor is·.· energized charges

closing

is

ready

of the prop

either

m~ually,

breaker,

closing switch. Upon the

roller

the closing

breaker

electrical

through the . G switch. contacts, · and

the closing springs. When the

springs

for

a closing operation upon

roller.

by

or

in the

same

fully charged the

This

may be accom-

depressi

.ng the closing

electrically

springs

discharge and

manner

breaker.

by closing release

as

on the

springs

is

the

of

reach operated Upon

the

fully charged position; the mechanically

switches

operation

operate,

of

these

reversing

their

switches the

coniact:S.

motor. stopped by the. opening of the G swit~h. The closing of the F closing

operation.

switch

prepares

the

bre.aker

.

Fig.

2 (8939671)-

.

1.

Front

view of AK-2-50

Auxiliary Switch· .

bre~e~

2. Position Indicator

3.

Relay

4. Manual

5. Shaft

Trip

Button

for

Manual Mainte- ·

nance Closing Handle · ·

6.

Spring

Charged-Discharged

Indicator · ·

7. Motor Cut-off ·Switches

8.

Arc

Quenchers

A closing

relay

X whose contacts

circuit

closing

.

as

descr~bed above. At the l\elay contact rel~y .causing the .anti-pump

When the

ted

G switc

. and the F switches open and de-ene:1;gize

trol

relay

is

tripped

the motor

for

the next closing operation.

signal

through the closing

relay

breaker

hes

from

now given ·

energizes

close

relay

coil energized the

same

closes

its c·ontacts

feature.

close

to energize the anti-pU

to re\_'erse

·

closes,

the mechanical

to energize the

being .energized

and

coil. breaker

time

until

open. With' the . G switc~es c

charges

the closing

sprlngs

the

comple:

. Wi

the·

providing

motor

the

brtsed

1s

for- a

cont;;

the

8

clo~e g

clos:P

oper~~

ag~-

:er-

dy'

rea

·

4

EL

ECTRICAL TRIPPING

-

The

breaker of tha these

instructions. tripped current these

devices

i.e.

·the device paddles the

trip

most

The shunt as

trip

shown the shunt

electrical

by the automatic

tripping devices, if

fastened on the

shaft

in trip

may

be

tripping devices

. The

trip

the

trip

and displacing the

commonly

device connected in the control

Fig.

1.

When a tripping

coil

is

energized through a nortrlally-

open auxiliary switch "

breaker.

· tbe

. .

MAINTENANCE

tripped

electrically

described

breaker

may also

overcurrent

so

equipped. All

breaker

arm

used

inasimilarmanner,

moves

trip

against

shaft

, thus rotating

trip

latch.

tripping device

signal

a"

-contact, thus tripping

or

is

by any

in

be

reverse

the

trip

is

the

circuit

given,

Low Voltage

Power

Circ~it

Breakers

GEK-7303

BEFORE INSPECTION OR WORK IS

IS

DONE

BE

SURE THAT THE BREAKER

IN THE OPEN POSITION. ALL ELECTRICAL POWER, BOTH PRIMARY SOURCES, SHOULD

Warning: On

ergy

closing mechanisms,

when the

circuit

ALSO

breakers

breaker and when any inspection is

being done

open·

position

· being re15trained by dure

for

inserting

- INSERTING

AK-50, -

The closing

maintenance handle

can be

placed Continue to op ing the

takes

breaker.

the SJ?ring

- To il)stall the

energy mechanism

STORED- ENERGY MANUAL MECHANISM on page

17

of

these

instrucUons.

so

that

and the closing

the

the safety pin

75

. (Fig

sprini

~hould be charged with the

(1)

in

the hole of the push

er.ate

the maintenance· handle,

This

force

safety

refer

With the safety pin

spring the operation

ment

sprmgs

from

ing

force, the. contacts will

breaker

is

manually

of the mechanism and the contact align-

~o

be

visually observed.

. . -

.

!allowing

the inspection

must be recharged, the

the

push

rod, and the pin placed

spring

clip adjacent to the push

ANY

MAINTENANCE

AND

· CONTROL

BE DISCONNECTED.

employing

care

is

or

maintenance work

the

breaker

stored-en-

must

being

springs

safety pin. The

is

given below.

SAFE

TY

-

and

-100

•.

3)

. .

so

that

is

done

·

the safety pin

so

that

.

pin of the manµal

to the

restraining

operated

section

close

period,

safety

the closing

s.lowly when ·

a1lowing the

the closing

in

the

rod.

be

taken

installed

is

in

the

are

proce-

(3)

rod

(2).

clos-

the safety

stored

-

entitled

removed

retain-

Fig. 3 {8039670) View showing operation of

· AK-2-50 ·

breaker

with manual maintenance

handle and installation. of safety pin,

1.. Manual maintenance 'Handle

2.

Push

Rod

3.

Safety

Periodic

recommended ·

quent inspections

INSPECTI

inspection of the

at

least

once a

are

recommended

load. conditions, dust, moisture or_

-

able conditions

.of the

breaker,

should always

exist.

A complete inspection

including contacts and

be

made

after

terrupted a short-circuit.

At

regular

be

operated with the force)

make

fo

sure

without binding

If

the period that

of

arrangements . be

several

inspection periods the

manually; (stored energy mechanisms ·

safety

breaker

observe

all

or

six

months

restraining the closing spring

the contact alignment and to

mechanism

excessive friction.

remains

or

more,

made to open and close

times

in succession, . preferably under.

load.

If overheating, not caused by overcurrent,

observed, a complete inspection

should

be

made including connections and contacts.

ON

parts

-open

circuit

year.

other

arc

the

breaker

move freely

or

closed

it

is

recommended

of

the

break~r

· More

if

fre-

severe

unfavor

quenchers,

has in-

should -

for

breaker

is

a·

it

is

5

GEK-7303 Low Voltage

Power

Circuit

Breakers

TROUBLE

Overheating

to Trip

Failure

AK-2

Breakers

Failure

to

AK-3

Breakers

Trip

TROUBLE

SHOOTING

CAUSE

Contacts not aligned. Contacts

with

Contacts

dirty,

greasy

burned

or

dark

film;

badly

Current-carrying surfaces

coated

pitted.

dirty.

Corrosive atmosphere.

Insufficient bus Bolts and nuts at terminal connections

uot

tight.

Current in excess

or

cable capacity.

of

breaker rating.

Excessive ambient temperature.

Inductive heating;

of

Travel

positive release Worn

- Binds in overcurrent Loose

Disconnect Plugs. Loose

Tap Connections. -

tripping device does not provide

gt tripping latch.

or

damaged

or

trip

unit

parts.

trip

de.vice._

Disconnected Power Sensor

Broken Power Sensor Coil

·

REMEDY

Adjust contacts.

Clean contacts.

Rep~ace contacts.

Clean

surfaces

carrying Relocate

enclosure. Increase Tighten, but

limit

of

breaker

Check

circuit

of

parta.

or

capacity

bolts

by

current-

proVide adequate

of

bus

do not exceed,

or

fittings.

application

_decreasing load. _

or

cable.

elastic

ProVide adequate venWation. C~rrect

bus

or

· cable arrangement.

Re-adjust

Replace Replace Tighten

Plugs. Tighten

or

_ replace tripping device.

trip

unit.

overcurrent

or

Reconnect Disconnect.

or

Reconnect Tap Connections.

trip

device.

modify

__

False

Tripping

AK-2

Breakers

False AK-3

Failure and Latch

Burned Contacts

Tripping

Breakers

.

to

Close

Main

Overcurrent pick

Overcurrent time setti!)g too

Bind

in

overcurrent trip device.

Captive Thumb Screw

Loose Fail-Safe Circuitry Reverts . Characteristic to Minimum Setting

and Maximum Time Delay.

Tap Setting Dial on Power Supply Incorrectly Set.

External Ground Sensor Coil Improperly Connected.

Binding in attachments preventing

resetting

Latch out

return

Latch Hardened

Safety pin left

up

too low. _

on

of

latch.

of

adjustment.

spring too weak

or

gummy lubricant.

in push rod.,

short.

Power Sensor

or

broken.

Motor burned out.

Faulty control circuit component.

Improper contact sequence not sufficienUy parted

part).

Short.circuit

rupting r.ating

of

contact wipe

Loss

.

current

of

breaker.

when

leJel

or

pressure.

(main contacts

above

arcing contacts

inter-

Check application

trip

deVice. ·

Check appllcatiOn trip

deVice.

Replace

Setting.

Set Dial Sensor Coi! Tap.

Refer of Shield and Conductors Connecting

the

overcurrent

Tighten Thumb Screw on

to Correspond with Power

to

and Connections. Check Continuity

Fig.

External

of

overeurrent

of

overcurrent

trip

device.

Desired

40 Page 38

Ground Sensor Coil

for

Pola_rity

Re-align and adjust attachments.

Adjust latch,

~eplace

spring.

Clean bearing

and

latch surfaces,

Remove safety pin,

Replace motor.

Replace

Increase

contact sequence by raising

ing

main

ReQuires

replacement

quate interrupting capacity.

Replace and

dress

,.

-

or

adjuat faulty device.

arcing contact wipe. Adjuat

movable

stationary contact

contact pivot block.

system

study

With

breaker haVing

. up

or

replace contacts. _

and

or

lower-

possible

springs

ade-

6

At

all. times pencil ials breaker

lines,

to

remain as

they may

points of different potential and

electrical

The

at

a circuits electrical

~reakdown.

breaker

rated

are 'properly

attachments

it

is

important not

paint,

oil

or

on the insulating

cause

should-

voltage

be

to

assure

connected and

are

.other

foreign

surf

low

resistance

result

operated

that the control

functioning

to

·permit aces

in

several

that properly.

A complete contact inspection, including con-

tact

wipe and ·

lar

inspection

short

circuit determine pitted or

in

replaced. quenchers ing contacts and replaced original

erate

and

thickness.

In

general,

lubrication.. _Mechanical bearing points

sliding regular G-E

Lubricant

tact

surfaces ricant be using

BE OF

D50H47. Hardened

removed

kerosene.

REMOVED

DIRT OR

pressure,

periods current

whether

which

It

to

properly

when they

the

surfaces

inspe

_ction

D50Hl~ . Sli<lingsilver plated con-

should

from

ALL

TO

DUST

should be made

and always

has been

the

contacts

case

is

they should be

necessary

to

inspect the contacts.

arc

quencher

are

LUBRICATION

circuit

barriers

eroded to half

breaker

should be lubricated

periods

be

with a thin film of

lubricated with G-E Lub-

grease

latch

and bearing

EXCESS

AVOID ANY

LUBRICANT

. ·

after

interrupted,

are

worn

remove

should be

requires

and

dirt

surf

ACCUMULATION

mater-

of the

between

eventual

times

all

at

regu

-

a known

to

or

dressed

the

arc

Arctheir

mod-

at

the

should

aces

by

SHOULD

Low Voltage

5. Remove the auxiliary

··

(5-,

Fig.

20).

6. Check along the·

anical

interference

overcurrent

Power

Circuit

or

trip

device and the

Breakers

switch

trip

shaft

connection between the

Remove mechanical · connection if if

interference

removing

to

avoid mechanical breakage of

or

reassembling

frames

the

should

trip

shaft

NOTE

:

be

fastened to a suitable maouting

the

front

as

the bolts

BASIC

The

arc regular cracked thickness, they should be

inspection

1. Be

or

sure

exists,

re-assembling

use

extreme

front

and

trip

the

front

and

rear

frames,

be

is

hori

zontally aligned.

It

is

recommended

frame

supported by a sling

are

being installed.

BREAKER

ARC QUENCHERS

(Fig •.. 4

positioned

vertically

that

COMPONENTS

and ·5)

quenchers should be inspected

period.

eroded to one-half

REPLACEMENT-AK

the

breaker

If

rep_lacec;i

BREAKERS

is

open.

the

their

.

2. Remove the channel-shaped retaining

by removing two

3.

Lift the quenchers

arcin

g co~tacts.

screws

and two

clear

nuts.

of the· movable

GEK-7303

operating

for

trip

present,

care

back

rod

a mech-

paddles.

or

when

frames

devices. In

the two

so

that

the

breaker

base

with

or

hook

at

the

barriers· are

original

bar

The

use should become destroy

be

entangled

the

On drawout disconnect Grease

Specificati~n D50H47. .

To

repair

anism, ox:

frame

must

To -separate

1. · _ The

the

safe!}7

2.

_

part

from

using a

include

Remove ·the two opening

o! the

3.

Remove the clevis pin (14,

the

center

4.

Remove the

socket

the

of

cotton waste to wipe

avoided,

as

under

the cotton ravelings may

the

bearing

surfac.e of the bearing.

breakers,

studs

SEPARATION OF FRONT

the

should -be

AND

or

replace

overcurrent

be

separated

the two

breaker

in

place.

the contact

greased

REAR

FRAMES

contacts·, operating mech-

devices, the front

from

the

frames contacts

pro~eed

must

(See MAINTENANCE.)

springs

~reaker)

from

the

outside

Fig.

pole unit.

six

nuts

from

wrench with an extension.

two nuts

at

the top of the

surfaces

surface

· with G-E

back

as

follows:

be

open with

(on

pole units.

6)

(13, Fig.

the back

and

of the

frame.

lower

7)

frame These

frame.

4.

.During _replacement be careful overtight~n the shaped retaining will bow the

cher

loose. · · ·

·

The is breakers except the

center-pole

similar

that

breaker

to· the

and

the

open and the

Replace the

Type AKF

1. Be

breaker

sure

screw

bar

REPLACEMENT-

arc

is

replaced

breaker

which

bar.

Overtightening the

and leave the

arc

quencher of

·AKF

secure

center

BREA~ERS

these

quenchers of the standard

in a

similar

must be closed. With

closed the center-pole contacts

arc

quencher can be remov.ed.

outer-pole

as

follows:

the

breaker

arc

quenchers of the

is

open.

r.iot

to

the channel-

screws

arc

quen-

breakers

manner,·

are

2. Remove the two channel-shaped r_etaining .-

bars

which

bear

against the front of the

arc quenchers by removing four -screws, two on each side.

3.

Lift .the

-

arc

quenchers

clear

of

the movable

arcing contacts.

arc

4. Replace

screws

quenchers and

holding the retaining

insert

bars

the

four

in position.

GEK-7303 Low Voltage

Power

Circuit

Breakers

. . . . . .

1·· 2

Fig.

4 (8014830)

Disassembly

1. Stud

2. Cap

3. Side

DISASSEMBL

CENTER

POLE

The following

Type

AK

and AKF

1. Remove

MENT).

2. Remove

3. Remove

Y~AK

(Fig.

AND

4) -

instructions breaker

arc

quenchers

screws

spacer

AKF

holding

block,

4.

5.

center

(8), and compound support (7).

4. Rock muffler

The

inner

barriers

(6)

slightly and

(5)

can now be

inspection.

5. Remove nut and withdraw

6. Remove cap (2). The

(4)

barriers

7.

in

the

after

replacement.

1.

on

sides

2. Remove hardware

quencher

should be

Reassemble and

reverse

DISASSEMBLYPOLES

Remove

order.

(Fig.

arc

quenchers

free.

replace

Tighten

AKF

5)

on a flat surface. ··

from

as

indicated in Fig. 5.

.

..

. :

..

.

. .

,,

, '

Pocket Inner

apply

poles.

(see

spacer

steel

stud

side

the

OUTER

(8Ce

one

:;.:

:·::··:

~--

.·. : ·· ...

.. .

of

Barrier

Barrie~

Barrier

to

both

REPLACE-

block (9).

back

removed

(1).

(3) and

arc

quencher

the

fastenings

abov

e)

side

. . :

.-

: :

.

arc

quenchers-standard

tl1e

plate

sembly

plate

are ware by

remove.

for

pocket

arcing actuating linkage and the mounting Fig. 8 and

and

of

lay

arc

back

sists pin provide

breaker

6. Muffler

7. Compound

8.

Steel

9.

3.

Back

Spacer

Remove

Block

assembly.

4.

Barrier

for

inspection.

5.

In

reassembling,

positioned

are

in

line.

overstressing

POLE UNIT A

NOTE:

contained

covering

The

in

the is· applicable referring

parts.

case, Each

to

These

be

identified

pole

contacts,

9, pole unit

frame

The

assemblies.

stationary

of a

set

(3), and

continuous contact

and AKF

Support

Plate

bolt

fastening

plates

so

that

holes

Do not

may now

strip

screws.

SSEMB

text

and

this

AK-50

to

Fig.

part

section

breaker.

the AK-

7 and identifying

similar

by the

unit

assembly

a

set

arcing-contact

of

parallel

compression

center

cap

be

make

sure

for

self-tapping

threads

LY

(Fig. 6)

identification

apply

to The

75

and 100

parts

may not, in

same

number

consists

of mai~

assemblies

assembly

contact

sprin

gs (22), which

pressure

pole

.

(4)

and

barrier

lifted

from

· components in

compound

numbers

illustrations

same

breakers

the

similar

every

.

of a

set

contacts,

base. mounted on

fingers

for

the full

as-

hard-

text

by

of

the

See

con- ,

(2),

Fig.

5 (8019408) Disassembled

GEK-7303 Low Voltage

arc

quencher- AKF

outer

Power

poles.

Circuit.Breakers

1. Muffler Assembly

2.

3.

Spacer Inner

Block

Barrier

4. Cap

travel the pivot pin to pivot point when interrupting high earlier

· of · the

model

contacts.

pr

_event possible pitting

breakers

Steel

flexible

springs

(5)

currents. · On

braid

leads

shunt

at

the

were

used.

rhe

movable ~rcing-contact a~sembly consists

of

parallel

·able pivot

contact

pins

arms

(8)

and (19). The

(4)

carried

arcing

on two mov-

con.tacts interleave the main · contacts and pivot with them about pin (19).

linkages

from

the

relative

upper

motion

(7)

is

obtained by.

to the

breaker

This

mechanism. . . ·

stationary

Th·e main and contact and will, and

intermediate

surface

therefore,

break of contacts in

Table

I.

after

main contact

contacts. The

assembly

intermediate-

includes

extends beyond the main contacts

make

before

the main contacts

the main contacts. The number

for

each

breaker

rating is· given

The movable main contacts pivof around a stationary lower pin

.(7), connected by an insulated breaker shunting

lower

!the

con~cts

liiie

at

the

jassembly

pin (18), which holds

·block. Motion mechanism.

the

current

is

In

from the contact ·

contact block,

pivot

also

ag~nst

pomt. The movable main contact

the pins to prevent pitting

contains main and intermediate

obtained addition to

steer

springs

them

from

link

ste·e1

. to the

a second

(12). to tl\e

springs

directly

(17)

force

!contacts.

5. Intermediate

6.

Outer

. 7. Side

In

of contact

Plate

order

Barrier

to function

pressure between . the movable and Table I gives the

contact wipe. Both wipe and cpecked during the_

MEASURING

· 1. Remove ARC

under

QUENCHER). .

2. With the

zontal distance contact to the dim.

for

arcing

contacts). ·

3. Clo.

se

the

difference between the readings in items 2 and 3

to

determines

reasons

breaker.

1. Remove

UNDER

the wipe of the · contacts.

be extremely careful not to trip the

· . ·

MEASURING

(Fig.

ARC

QUENCHER).

2. Close the

"B".

3.

Open the breaker.

Barrier

properly,

a definite amount

and contact wipe must

stationary

figures

for

contact

pressure

regular

CONTACT

arc

quenchers

breaker from

. the edge of the stationary

stationary

WIPE

(see

open,

block behind

contacts, "C" dim.

breaker

and repeat

inspection period.

(fig. 6)

REPLACEMENT

measure

contacts.

pressure

should be

the hori-

it.

for

item

For

CONTACT

6)

arc

quenchers (see REPLACEMENT

breaker

PRESSURE

and measure dimension

Place

a push-type

exist

and

-:

('.'B"

.main

2. The safety

scale

Low Voltage Power Circuit

Breaker ontacts

Type

No. Per

Breakers

Main Contacts - Intermediate Contacts

or Pole

GEK-7303

Pres-

sure

In In

Lba,

Wipe

Inches

TABLE

No.

of

Contacts

Per

Pole Lbs,

Pres-

sure

In

Wipe No.

Inches

ln Contacts

of

Per

Pole Lbs,

Arcing Contacts

Pre=r-

sure

In

Wipe

Ill

lnches

AK-SO

tor

AC

AK-SO

tor

DC

tor

AK-75

AK-I AK

_ AKF-2C

-

AKF-2D (Outside AKF-2£' (Poles)

AKF•2C (Field AKF-2D Discbarge

AC

tor

DC

00

for

AC

-100

tor

DC

(Oulside Poles

Contacta)

• The intermediate conta~t

~

•

Ldt

stationary contact ext;nda approximately 3/32 in. ~ 1/32 further than right band contact.

-

·:

..

3 55

3

55

5 35 to

-

"

35

5

-

8

25

3 55 to

.•.

.

5 55 to 65:.

0

-------

wipe

to

65

to

65

45

to

45

.

to

35

65

should be

4/64 to

. '1/64

1/16 to

'1/64 .

1/16 to

7/64

1/16

?/64

1/16 to

?/64

1/16 to

'1/.

64

1/16 io

'1/64

-----

at

le~t

to

.

1/16

1 55 to

1

I 35

2

1,

I

0

in.

against the stationary arcing contacts at . a point

in

measured

line with the breakbetweenthecontact

stop and the contact pivot block. Push the contact

backward until dimension ."B" ·recorded in item

2

is

reached. The

4.

If

the

ments

listed

pressure

on TABLE

of these instructions dealing with

CONTACT

1. To obtain

on the

WIPE

ADJUSTiNG AND

center

scale

should then be read.

is

not within the

I,

refer

to

require-

the section

ADJUSTING

AND

PRESSURE.

PRESSURE

proper

·coNTACT.

contact wipe andpressure

(Fig.

WIPE

6)

pole, dimension "A" should be increased to increase wipe and decreased to decrease wipe.

· 2. To ch.ange dimension "A" remove the clevis

(14)

and rotate the clevis

as

necessary.

. 3. . To prevent overstressing the clevis threads

(13)

dimension. "

space.

'.'A"

should

A"

should not exceed 3/16 in. and

be

filled with shims to 0.005 in.

of being solid.

4.

·

moving·

With the proper

the

crossbar center pole to the right will simultaneously crease

the wipe on both outside. poles; moving

the adjusting plate to the left will have the

center

pole

WiJ>e

adjusting plate

obtained,:.

{lOA)

reverse

on the

in-

-

to

-

to

.

greater

.

65

55 to 65'

35 to 45

to

45

25

to 35

55

to

65

55

to

65

-----··--

than main ·contact wipe.

•

.

•

• ·

--

2 31 to 43

3

31

3

31

5

31

-

5·

31

2 31

3

.

31

2

..

10

12/64 to 18/64

-

to

43 12/64 to

to

43 12/64 to

to

43

to

43

to

43

to

43

io

16

18/64

18/64 12/64

187?4. 12/64 to

18/64

28/64

40/64

effect.

5.

To

increase individually, move the that

pole

to

the

the adjusting

plate

NOTE:

does not within springs

CONTACT

On

the

horizontal plane, making be tween

If

of the arcing contacts

no

greater

arcing

it

is

desired

·the wipe on

left;

to

If

exist

its

limits,

crossbar

to

the

right.

the

proper

when

either

outside pole

adjustin~ plate of

decrease

the wipe move

contact

the

contact

the

stationary contacts

should be replaced. ·.

SEQUENCE

(Fig. 6)

the

difference in the

on

the same pole must

than 1/32 in.; the difference

contacts on

to advance

separate

or

retard

poles 1/16

of the main contacts of a pole .loosen the bolts holding the adjustment plate

slide

and closing, Make

center

the

plate

or

this

adjustment on the

pole

to

the right to

as

the left to advance

a reference.

ening adjustment plate· bolts,

ing

tabs

are

turned

the bolts

. Contact sequence·

be such · touching,

securely

that

when the. arcing contacts

the

intermediate contact gap should be

up

a:r:ound

in

p~ace. . . .

in

the

(10A)

retard

outer

make.

bolt

vertical

of

contact

poles, usmg

Upon

sure

heads,

plane should

pressure

y.,ipe

is

~e~

m.

the closing

that pole

con~ct

~los~g

retight-

the lock-

locking

are

just

Low Voltage

Power

Circuit

Breake~s

GEK-7303

1.

2.

3.

4.

5.

5A.

Screw Stationary Pin Movable

Spring

Stationary

.

Arcing Contact -

(Stationary

Arcing

Contact

(Leaf Contact) _

Intermediate

6. Movable Main Contact ·

.

7.

Shouldered

8.

(Arcing Contact Links)

Insulating Pin

(Insulating Link)

.

9.

10.

lOA. Adjusting

10B.

Buffer

11.

12.

13.

14.

15.

16.

·

17.

18.

19.

20. Side

20A.

21. 22 •.

23.

24.

·

25.

26. 27 • .

28.

(Side Link) Link Clevis Clevis

Lower Pole

Unit

Spring

(Main Movable Contact) · Pin

(Movable Arcing Contact)

Link

Contact

Spring Spring Upper Leaf

Spring

(Stationary Main Contact) -

Stationary screw Stop

Link ·

Plate

Spacers

Stud

Base

(Main Movable Contact)

- _

Stop . - · -

-(Statio:f1ar.y Main Contact) - (Stationary Arcing Contact)

Stud -_ ·

(Stationary Main Contacts)

Main Contact

.

Contact)

Contact

1

2

3

4

5

~---t-..,,._---.....::,aa-...,

5A-~--t---\----~-

6

'l

8

9

10

-----

lOA

____

,

-

~

---------

•--r--+---+----...--

~~f/r:J__..-------1~

=-

{ -.

I

.J.------~l

______

___

----18

1-----16

.:=.;,,.-i----,

28

27

26

22

-

20A

20

15

·

a:t

least

1/4

3/16

in.

NOTE: -

means

by the

safety

If

the

-

usually

obtain tacts, two

either sions-are ing

contacts

If

ments the

and

When·

the

gap

possible

the

re_quired

place

feet

long,

forward

still

it

has

while obtaining

contact

adjusted,

the

movable and between 2 5/8 be

adjusted · by

in.,

the ·main: contacts gap

This

of the

is

under

to

form

dimensions.

a

piece

over

the

or

backward.

not

should

been

be

necessary

wipe and

if

necessary.

CONTACT

breaker

stationary

in.

varying

.

Fig.

6 (0107D7517rPote

check

- -

can . best

be made

m~~tenance-h~dle,-~ith

rel?trammg

the

th_e

required the

arcing

'FO

closing minimum.

contacts and

form

of conchnt approximately

contact

obtained

and

If

form

the

the contact

proper

movable

replaced.

to

make -any adjust-

proper_ contact

pressure

GAP

(Fig.

is

open,

contacts

and 2

3/4

the

must

6)

the

in.

number

sequence,

be

checked, -

gap - between

should be

The gap may

of buffer

at

l~ast

springs.

it

is

~e

con-

dimen-

arc-

unit

-

spacers

-

the

-tion

- _

screws

.top

(3,

tacts

.

contacts

ADJUSTING

assembly-AK-50

on

the

buffer

bolts

that

th~ buffer

REPLACEMENT

(Fig.

- Stationary

(1,

Fig.

1. Remove

_

cross-bar should.

6)

- .

A~cing

7) -

the

upper

• . The ~ocking nuts

be

locked m

bolt

may

OF

CONTACTS

Contads (2,

plate

be

by removing two

. (1). On the -AK-75 and -100 r~move

contact

Fig.

2.

3 • . - Remove pin

4.

5. Adjust contact wipe and

Qlock (25,

7).

- .

Loosen

and

__

screws

springs

Install

in

reverse

CONTACT

Fig.

7)

and remove insulation

holding

(3)

freeing the

spring.

(22). · ·

new springs and

order.

WIPE

stationary

·

AND

stationary

pressure.

such

rotated

Fig.

a pos1-

fre~ly.

_6)

- (5)

arcing

PRESSURE).

<?D

~e

con-

(See

,,

GEK-7303 Low Voltage Power

4

5

Circuit

Breakers

· I

l

I

I I

I

STATIONARY

COOTACT

.

2.

P1N

(STATIONARY

25

24

23

22

21

20 19

18

17

16

5 -

4

-

CONTACT)

3. lNSULATI

4. ID.ABLE

4A.

STA

T.

CON'lllC

5.

MOI.AB.E

6

SHOULDERED

7.

LNK

a

(ARCING

LINK)

9.

INSULATING I Q PIN ( INSll.ATING LINK ) IO

A.

A.OJUSTING

II. PI

N (S

12.CLEVIS

13. CLEVIS PIN . LOWER

14.

15.

POLE

16.

SPRING

CONTACT)

17. PIN(MOVAEl.E MAIN COOTACT)

1a

P1N(MOV

C

ONTACT)

19 SI

DE

2Q

SPRING (

MAN

2i

. ~ (

ARCING

-22.

Uff>ER

2

3.

PIN(STATIONARY-MAIN

CONTACT)

24.

STATICNARY

CONTACT

25. TOP COOTACT

"ARCING

-

OO

ARCf'.lG

NTERMEDIATE

T

MAN

CONTA

CONTACT

LINK

PLATE

IDE

.LI

NK)

STU

D

UNIT

BASE

(MA

IN

MOVABLE

ARCING

ABLE

LN<

STATIONARY

CONTACT)

STATIONARY)

CONTACT

STUD

MAl'l

BLO

ARCING

CO'JT

ACT

CT

CK

The . movable

replaced replaced

1.

. frame AND

as

REAR FRAMES.

2. Remove

the contacts.

3.

1.- Remove

12

·

Fig

arcing

when the

stationary

.

Separate

described

Reassemble

the

front

under SEPARATION

pins

(8) and (19) and withdraw

parts

in

Stotio~ory,lntermediate and Ma

Conta

d1

(Fi

g. 6) _

stationary

. 7 (215D174)

contacts

(4)

arcing

frame

reverse

arcing

from

order

in

ctonacts

Pole

should

contacts

the back

OF

FRONT

.

as

unit ·

be

are

de.;.

assembly

scri

- AK-75 and AK-100 .

bed above.

2. Remove

which holds

3.

~in

Remove .

stop (20A) which h.olds

contac

t.

Removal

on the contact

can

be

accomplished

with

the maintenance

in

place,

·

relieved.

until

4. Loosen

upper

stud

to

the pole unit

screws

(25)

(27) and remove

in

place

•

main-and

the

lower

will

be

springs

facilitated

(21)

is

by operating the

handle,

the

load on the contact

· ·

the hardware

base

bracket

intermediate-contact

part

of

stationary

if

the

neutralized.

force

This

breaker

with

the

sa!ety· pin·

stop

is

-which until

fastens

the

contact

the

.

Fig.

8 (8014678)

Front

view of back

assembly

- AK-2-50

frame

Low Voltage

Power

Circuit

Breakers

GEK-7303

Stationary

1. Contact

Movable

2.

Contact

Stati9nary

3.

Contact Clamp

4.

Movable Main

.

5. Contact

spring

lift

5. out

. ·

load

Remove contacts.

~--Reassemble being in

described

at

th~

·

1.

2.

3.

· bottom

careful

proper

Remove

above. Loosen Remove

of

Arcing

Main

:

on

to

position.

Movable

_

Main

the

spring

braid

contact.

(25)

is

(~5i and

contact.s

replace

Intermediate

Contacts

movable

(17).

if

6.

Crossbar

Series

7. Device

Movable

8.

mediate Contact

Stationary

9. _mediate Contact

relieved.

screws

in

the

intermediate

(F1g.

and

6) ·

arcing

present

by

· ·

Overcurrent

Inter-

(27)

and

reverse. orger,

contact

·

contacts

removing

as

screw

Fig.

9 (8039669)

1.

.

2.

·

3.

ing contact

Power Disconnect Tr;msformer

replacement

Front

·. ··

assembly -AK-3-50

Sensor

view of

Coil

Assembly

Plug ·

Taps

in

!

.

back

Amper~s

frame

(See ADJUSTING CONTA_CT WIPE AND PRESSURE).

OPERATING -MECHANISMS

ELECTRICALLY

and

.

The

ele~trically

a

motor

the closing

shaft (14,

with a

closing

llC.

and

center-pole crossbar

.

of the

contacts

-100;

and a

Fig.

roller

cam cam

it

OPERATED

MANU~L

gear

springs

10). The

(12,

(2,

Fig.

roller

The

closing

unit

through a

controls

~m

all

AK ·

.AK-50,

-50

-75

·

operated · mechanism

reduction

(16, Fig.

11).

is

shown in·

unit,

Fig.

10) through a

crank

shaft

10) which The

which charges ·

ha~ an

rides position· of Fig.

11A,

cam is. connected to the

clevis

and through a

the opening and closing

pole

units.

includes

crank

arin

on the

this

11B,

4.

(7).

5.

sid~ to

be

6. Always

Slide

link

Slide ·pins

to

allow

replaced.

Reassemble

check

(12) to the

(7)

the

movable

parts

contact wi

and (18)

intermediate

in

reverse

pe

and

side

and off of p4l

far

enough

order.

pressure

to

the

contacts

follow-

1.

The

Fig.

llA.

2.

The motor turns the crank

is

mounted

tion unit. face of

on

it.

Chargi

ng

mec~anism

on

The

the

crank,

the Closing Springs (Fig.

in

position

the

output

charging

has

shaft

roller,

paddle

of

arm

10)

is

the

gear

which

(11)

shown

(10)

is

in

which

reduc-

on the

bearing

13

..

GEK-7303 Low Voltage

Power

Circuit

Breakers

·

~C>IANSM

RESETTING

FIG

~

·IIA

N

t.1111:lN"

AS

SHOWN IN.

BEFORE

FIG.-

I I B

~CHANSM

FIG.-

N

116

RES€T

POSITlCN

3.

paddle

springs

of the

_5

6

7

1.

Z..

Bushing

3,

Bracket

4 .

Indicator

5.

Bracket

6.

Frame

7,

Crank

8,

Gear tion

9.

Motor

10,

Crank

Fig.

10 (541E304) Closing

· · and

As

the

arm

upward, there~y

through the

crank

shaft.

Roller

Reduc

Unit

crank

11,· Paddle

lZ.,

13.

1'4:

15.

..

16.

17, 18,

chargin

turns;

spring

15

14

13

·12_

II

IO

··-

~-

Closing Roller Closing

Arm

Crank Spring ing Closing Push Clip

g mechanism

the

Cam

Shaft

Charg-

Arm

Spring

Rod

spring

roller

chargi~

charging

·

pushes the

the closing

arm (15)

13

~2

2

3

Spring

.•

Cam

Link Reset

Prop

Adjus.ting Adjusting Prop Roller Trip Trip

Clevis

Latch

(Bronze Roller Prop

FIG.-IIC

N

a..osED

SPRf'lG

Spring

Adjusting

Return

Latch

Shaft

Buffer

POSITl()'.I

ClSOtARGED)

Nuts

Screw Screw

Stop

Spring

Stop

Material)

tJE:CHANSM

(CLOONG

1.

z.

3.

4 .

4A,· Spring

5.

6.

7.

8.

9.

10.

11. lZ..

13.

14.

15.

16.

()

···

--9

-8

·7

6

4.

As

center

motor

5. The

the

a cut-off

circui

t. breaker

a closing signal

6. With the

· position, the reset roller

(2,

14

position.

(15,

Fig

. 11B).

. charging

switch

is

breaker

trip

This

Fig.

llB)

is

roller

opens,

now

approaches

de-energizing

ready

to c

given.

latch

resting

may.

or

at

may

depends on. the position

with

respect· to

lose

the

precharge

not be

the

dead

the

when .

in

the

of

cam

1.

··

above a

closing

to

charge anism tion shown

Fig.

11 (541E305) Operating mechanism

With

and

to

reset,

Closing

Electrically

the

signal the

in

Fig. UB.

the

Operated

mechanism closing

·

will

cause

closing

springs

u· not

halter

in

the position

springs

the motor

already

(Fig.

charged, applying_

allowing

resP.t, to

10)

described

to

co

ntinue

the

mec~-

the

posi-

Low Voltage

•1:

.

Power

Circuit

'

..

Breakers

. . ' ;

.. ~ ..

': .

...

~. ··

GEK-7303

:··

·•. -

Fig.

1i

(8018989)

AK-50 showing

~

2.. As dead-center position) the

Crank (10)

motor so-

center

·

3.

the

crank

to

rotate

F.ig.

11).

llC)

in

4. Raising

breaker

Tripping the Breaker (Fig.

·Operation

the

trip

to

release forces reposition the

position

the operating ·

Adjustments (Fig.

the

crank. roller

position,

closing

can

be

that

roller

position

As

this

without

the

springs

shaft cam Prop

position

'(14)

(2,

(16,

clevis

contacts

of

-any

shaft

(11)

the

latch

of the· contact and opening

the

operating

shown

cycle

11)

Rear

view of

cam

shaft

locking plate

being loosened

(7)

(maximu.m

springs

overdriven

(7)

are

independently of the

assumes

restraint.

free

its

:-

discharge,

causes

Fig.

roller

11) and

11) holds

raise

~

(13,

Fig.

llC)

through the pole

11)

of

the

trip

devices

which ;µlows

prop

(5).

the

This

mechanism linkage to

in

Fig.

may

llA,

be

repeated.

In

fronnrame-

passes

spring

its

charge

to

discharge.

top

bottom dead-

the rotation of

(15,

Fig.

11)

clevis

cam

closes

base

(13,

(2,

Fig

the

linkage.

rotates

trip

latch (10)

allows the

springs

this

position,

to

Fig. manual

and with

roller 1/64 in, and obtained by

should

.

latch be reposition

(3) and 1/

32

the nuts (4A)

.the

Replacement

to the

AND

these

..

.!:.:

Fig.

13

(8018984)

AK-50 showing

~nd

llB.

(The mechanism should

operation

1.

roller

The

(9) of

(15)

gap between.the

the 1/32

turning sc.

2.

·

The

center

pass

through

buffer

stop

adjusted by loosening the retaining

the

3.

The . distance

prop

in.

reset

(5) should be between 1/64 in. and

To

obtain this gap, advance

spring

Rear

view of front

cam

shaft

cam

shaft

removed -

with_ the safety pin clear

of

cam-(2).

trip

reset

the

latch should be between

in.

This

rew

(6).. - · -

line

of the

center

of the

on the mechanism

latch

with respect to the between ·the

on

-the bottom of the

(4).

frame-

locking

plate

be

reset

in

latch

(10)

adjustment can be

trip

latch (10)

roller

(9). The

frame

screws

roller

or ~d

When replacing the operating mechanism,

section

BACK

titled

FRAMES

SEPARATION OF FRONT

under

MAINTENANCE

instructions.

by

place

.and the

can

to

roller.

on

link

retard

~ing

refer

in

All

ting

mechanism· in

adjustments

should

the

reset

be

made with the opera-

position

as

shown in

The

motor

is

mounted on the side of

the

g

ear-

15

GEK-7303 Low Voltage

Power

Circuit

Breakers

reduction unit and through a worm planetary with a reduction 1000:1. To remove the

and gear-reduction unit, _

1 • . Remove the

OF FRONT

2.

as

illustrate~ iii Fig. -

3. Disconnect the

the -wires attached to

4.

front unit. The.

NOTE motor unit, disconnect the remove only the hardware fastening

. - -gear-reduction unit. When removing the motor

· only, the front

· side

. ·

gear The

similar

oil

HFS

or

· change oil except when the gear'.'.'reduction

unit-and

g~ar

train

drives

proceed

front

frame

AND

R~AR FRAME.)

.Remove closing

Remove four bolts

frame

No.

QUICK

and one

motor

:

down unit. ·

gear

3.

motor

and

If

it

is

to prevenJ . the oil escaping from the

. reduction

to Atlantic Refining Company's Grade

·n

should not be

are

CLOSE

springs

12

and 13.

leads

gear

bolt

gear

unit may

desired

frame

unit

disassembled •. -·

the

crank

(see

from

motor and remove

unit housing.

at

the bottom of the

at

top of

to

motor

should be placed

contains 4 ounces of

BREAKER

ADJUSTMENTS

gear

(10, Fig. 10)

as

follows:

SEPARATION

and

crank-shaft

gear

reduction

n!JW

be removed .•

replace

necessary

only the

. leads - and

it

.

and a

motor

to the

front

to add

· .

.'

'c"

Fig

. 14A ·

Quick-Closing

Adjust the engagement of the to 1/8 adjustment

11

±1/64" by

"B". Adjust the

roller

the

Release

is

set,

clearance

to

1/32+0-1/64

Latch -Fig.

turning

lock

the

by

the

between the turning

14A

roiler

screw

bolt

on the

"A".

with the hex nut

the

screw

After

latch

and

"C".

The quick close

the standard

_ operati<;m

deadAs

_.!tie

bre_aker, the discharge operation

~

pi:ap

closing operation the

-latch to the springs operation and close the

The

is

· not interchangeable with the

uniLon the quick close to relieve the be

. exerted between the output

the prop. . ·

After the· closing springs have been completely

charged and the prop and latch

venting

tion may

relay.

ually- by

mechanically displaces the latch to allow the

break~r to

On breaker and enclosure be

discharged before the

from the

is

extended

center

. . .

position of the closing

springs and latch arrangement. The subsequent

release

to

gear

reduction unit

gear

reduction unit employs a

closure

be

.accomplished by energizing the closing

thni

the control relay contacts,

depressing

close.

drawout

enclosure.

breaker

start

is

the

continue the interrupted discharging

close

pressure

of

the

the push to

breakers

basically differs

in

that

~e

to

and slightly

. to discharge~ to close the

accomplished · by tripping

prop

which in

breaker.

for

the

unit because the quick

that would otherwise

breaker,

· . an interlock between the ··

requires

the closing

breaker

p~echarging

past

spring

is

arrested

turn

standard

gear

crank

system

close

lever

the springs

can be removed

from

the top

assembly.

allows

breaker

reduction

slip

clutch

plate and

are

pre-

opera-

or

man-

which

by

to

D

Fig. 14B

Release Arm Adjusting -

Adjust release arm screw the

armature

roller over-travel. NO

·

from

GO

of the closing

the

latch

with a minimum

·Check. by

gauge between

using

Fig.

l4B

"P"

so that

solen<:>id

1/32"

armature

the

stroke of

releases

GO

and

· and magnet.

of

the 1/32" 3/32"

16

.

Fig.

14C

Low Voltage

used

on

theAK-50,

closing

manual

··

The the breaker,

case

with breaker handle

is

!mu

through position degrees then

clockwise

approximately

stroke

have which have strokes

center

spring

and

This

assembly,

ot

mechanism

assembly, the

closing

Power

-75

springs

closing

instead

the

of

electrical

accomplished

complete

120

degrees

and

then

from

its

back

70

degrees

been

completed,

been

the

closing

the

breaker

ratchet

handle

shaft

handle.

Circuit

and-100

(5)

are

handle

the

(22) on

closing

breaker.

by pumping

cycles,

from

clockwise

normal

through

of

charged

handle,

closes.

consists

wheel and output

and pawl

Breakers

electrical

charged

the

by

front

motor

Closing

the

first

counterclockwise

its

normal

back

through

vertical

120

the the

during

basically

position

degrees.

fourth

closing

the

are

driven

of a closing

assembly,

GEK-7303

breakers.

operating

of

the

as

is

the

this

operating

vertical

120 and

When

clockwise

springs,

crank

and

Release Adjust

screw ta.ken up by

Adjust "F"

when

the be the to

Shaft Stop and

screw

and

lever

pressing

switchette

under · cotter

armature

The

control

left

side

removed

(3)

two mounting

admit

the

"E"

is

relay

of

the

by

disconnecting

top keyhole mounting, should and

side The

mo~al of . re-mstallmg

contact

solder

box the

Stored-Energy

be

contacts.

The

anti-pump

of

the

connections

the

points

of flux.

The

closing·

solenoid

remotely

replaced

front

to

relay

use

of

control

with

located D switches.

Manual

AK-50-75-100

This

stored-energy

breaker

is

mechanism

Switchette -Fig.

to

with

1/32"

clearance

lever

lightly

operation

pin, · so

adjusted

front

or

that

as

(X)

frame

screws

mounting

in

general,

rather

relay

channel

this

extreme

different

is

above

relay

straight

care

voltage

relay

sufficient

Mechanism

equipped

with a spring-charged

similar

clearance

on

forward.

by

adding

contact

shown

relay

channel.

the

wiring,

and

lifting

screw

the

than

changing

located

the

are

soldered.

forward.

to

avoid

consists

linkages

(Fig.

to

14C

between

release

·

washers is

made

above.

is

located

It

loosening

it

slightly

through

entire -relay

on

the

control

relay.

When

shorting

potential

of a

strong

to

operate

15) ·

the

mechanism

arm

on

may

the

coils

left

Re-

with

Closing the Breaker

The

first

stroke

the

ratchet

(23),

to

(17),

thus

The

subsequent same in

the

pawls

engage

beginning

function

ratchet

as

wheel (17), wheel and output th

_e closing

springs. This wheel and output direction

more dead are

at

a high

Inserting the Safety

1f

contacts operate

as

from

than

-180

center.

free

to

release

speed.

it

is

desired

to

the

described

the

In

check

closing

above.

counterclockwise the

fourth

(3) into

thus

preventing

releasing

Replacement

1f

it

anism

clockwise

their

(Fig.

'is

necessary

parts,

the

energy

the recommended. at

the

step

required

part:

1. ·

Install

the

above.

2.

Separate

described

under REAR FRAMES" of

these

instructions.

(Fig.

15)

of

the

closing handle

(21)

the

first

tooth of

to

char

closing

crank

handle

the

pawls

(32) and completely

crank

is

lower· position,

attached

degrees,

this

their

to a position

position

energy,

to the handle

the

ge

the

closing

strokes

(21) engage

thus

rotating

rotation

in a

counterclockwise

through

the

closing

ratchet

perform

of

just the

· .

(fig_.

15}

to

slowly

contact

handle 3

At

stroke

stroke,

hole

(4)

the

closing

to

close

15)

to

replace

following total

This

procedure may be.

to

safety pin

the

front and

"SEPARATION

"in

the "MAINTENANCE" sect.ion

close

the

wiEe- and sequence,·

1/2

complete cycles

the

end of

and

before

insert

in

the guide

performing

the

springs

the

bre~er

any of

the

procedure

replace

(3)

rear

OF

any

particular

as

described.

frames

FRONT

causes

shaft

wheel

sprin

the

teeth

the

ratchet

charging

the

ratchet

slightly

beyond

springs

breaker

the

fourth safety

rod

(6),

(5) from

contacts.

mech-

halted

as

AND

gs.

the

is

.17

GEK-7303 Low Voltage

Power

Circuit

Breakers

I .

;

§Ji

:j

I,

ii

l---+---+-;

H-++--

y.,_--

- 6 -

8-

7

---

------

-

--

-1-;.-.-'i-

-ll

II

ii

:i :!

II

L .. ~ ;

· Fig.

15

1

•.

Upper Spring

· 2, Safety

3.

·

4.

5.

·

6,

7.

·1.

9,

O. Bearing

Pin Safety Safety

Closing Guide Rod 16. Ratchet Wheel Shaft and Pawl Front Front

Holder

and Chain 13.

Hole . 14. Groove

Springs

Escutcheon Bearing

Plate

·

~-

""'-··-··-,

" ·I

(669D805)

Plate

;Mounting

31.

Lower

/'

,

'---··- ·

Stored-energy

11. Output

12.

15. Nylok

17.

18. Side

~

Bolts

19. Side

20.

~nrinO' 'Pin

r

Jl

manual closing mechanism

Thrust

Crank

Shims

Screw

Ratchet

Plate Plate

Be~ring Side

Roller

Bearing

Wheel 27.

Shims

Mounting Bolts 29. Handle

Plate

,,,,

Asm.

'"'-·

charged

21. Ratchet

22. Manual Closing Handle

23. Closing Handle Shaft and 24

. Roll

25. Main Closing

26. Pawl

Butter

28. Buffer Stop Support

30

. Mechanism

....

··•

,...

___

position AK-2

Buffer

stop

Return

,.

Pa~ls

Crank

Stop

Shims

Spring

Roller

Pawl

Asm.

.

GEK-7303 Low Voltage Power

1. Springs

2. Insulation

3.

Stationary Contact

4.

.

5. Screw

6. Movable Contact

7.

8. Buffer

· 9 •.

Crossbar

10. Adjusting

11. Bolt

Plate

12. Buffer

13. Screw

14. Shims

15. Bolt

16. Pin

17. Pin

Circuit

Breakers

6 5 4 3 2

Fig.

17

(227Dl 74) Field discharge c~ntacts

When

pull

outer poles. As the

(A)

toggle links

center-pole contacts through connecting Link forming a single

Contact Adjustments Measurements

of the two outside poles of the

to POLE

the

breaker

crossbar

rotates

(9) downward, opening the

about a fixed

(B)

(C)

consists

For

contact measurements and adjustments

is

tripped, the opening springs

crossbar

and

(C)

of

two

triangular

moves downward, link

center

(17)",

upward, therby closing

links

riveted

· link.

breaker,

UNIT

ASSEMBLY.

Contact measurements of the

center-pole

breaker's

collapsing

link

(D).

together,

refer

field discharge contacts should be made on the left contact and be

1. Contact wipe, 3/16 in. to

within

2. Contact

3.

Ga_p

open, 1

between contacts when

1/2

in.

to 1 3/4

the

following

pressure, ·10

in.

7/16

lb. to

limits:

in.

16

lb.

center

pole

is

4. Overlap · between the center-pole contacts

and the

arcing

contacts of the

outer

poles, 3/16 in

to 7/16 in. _ · •

Measurements of the center-pole contact wipe

13

14

(center

and

pressure

procedure

in POLE UNIT ASSEMBLY:· Overlap

may be made by following the

as

outlined

pole contacts and the

may be checked by the following

. - .

1. Remove

arc

pole)

for

the

outer

pole

quenchers

standard

of

arcing

procedure:

(see

ARC QUEN-

pole unit

the

center-

contacts

CHER). · . .

2.

Insert

safety

in

push

rod.

(See Fig. 3

under MAINTENANCE.)

Operate

3. ance handle until just

touch.

4.

Measure

left

stationary

closing me~hanism with mainten-

arcing

distance

contact of

contacts

of

outer

between forward edge of

center

pole and surface

of insulation block behind contact.

5.

handle

6.

Continue to

until

center-pole

Repeat

operate

contact opens fully.

measurement

maintenance closing

described in

step Difference between measurements indicates amount of

overlap.

Adjusting and

·· pole contact wipe adjustments

Center-pole

Overlap

If

·{Fig. 17)

measurements

should be made by the following

Contact

reveal

or

incorrect

Wipe

either

incorrect

overlap of confacts,

center-

procedure:

same

poles

4.

20

.

3.

Remove

removing

4. (20), and the removing four mounting the

5.

two

6. Remove

four

support.

7. Remove the handle

unhooldng

8. Disconnect

(7).

9.

the

(2~)

JO.

assembly and

they

11. Remove

three of

the disassembled. of the operation Replacement

from

· .

the

- . .

Remove

main closing

Remove

set

screws

scre

ws holding

Remove · closing handle to be.re.moved~

Remove thrust

must

also

mounting

breaker.

subassemblies

the

factory.

the

upper

the

right

side

plate

the

closing

threaded

the

front

either

be

end of the

the

shaft

the

(16) by

bearing

sub-assemblies

(12).

be

removed.

front

bolts

The

It

is

further

removing

mechanism

closing and

crank

it

roll

ratchet

bearing

(10)

disassembled

spring

lower

shims

in

to

top end

. (23)

If

not

removed

spring

·hand

bolts

(19),

(25)

handle (22)byremoving same

escutcheon

the

front

return

spring.

of

~in

(24),

and

wheel (17) and

Nylok*

shims

plate

accessible

recommended

should

assembly

pins

bearing· side

(18)

if

present,

thus

to

be

removed.

hole.

by

removing

frame

spring

each

pawl

thus

pawl

assembly

screw

(13)

are

(9) by removing

from

is

now completely

during the above

in

the field.

be

by

(1, 31).

plate

. by

allowing

center

(29) by

spring

allowing

its

(15)

present

thefront that

any

obtained

Low Voltage

imum

..

the be the the

freely should engage end of indicating a the should 3 stroke

ratchet in a manner to to groove screw

mechanisms, adjustments, vious. and

distance

ratchet

made

closing

3.

the

1/2

4. · The

be

Other

while

four

spring

springs

The -

throughout the closing

of

each

closing

clicldng sound

have

degrees,

• ..

wheel

tightened

1/32

in.

head.

adjustments. to

ly

d~scribed

-100

breaker

Power

wheel (17).

operating

ratchet

the

counterclockwise and clockwise

handle with a definite clicking sound,

free

a minimum

measured

groove

assembly

that

should

and

such

may

Circuit

from

charging

securely

the

are

reassembled~

pawls

ratchet

non-binding operation.

is

detected,

··

Will allow Nylok

exist

the

rear

as

· complete contact and

be

made

instructions

mechani

Breakers

center

This

measurement

the

closing

operations

(21)

wheel

overtravel

at

the end

(14)

(16) . A

between

surface

the closing and operating

by

sms

of

handle

should

strokes.

teeth. near

the

closing handle

of

in

the

must

be

clearance· of

the

of

following for

the

.

FIELD

SWITCH

GEK-7303

rotation

should during

and

before

operate

stroke

1/2

in.

each

handle

front

of

assembled

screw

front

the Nylok

the

AK-50,

of

.They

'the

After

or

the

(15)

1/64

of

the

la

tch

pre-

-75

)

12.

To

reassemble

_the

procedure

NOTE: When adjustments

.

the

appropriate . time appropriate dicated

Adjustments (Fig. 15). ·

Frequent

not

be

disassembled,

following adjustments: ·

1.

to

(16). · is

the

shims

clearance (21) touching the

*

It

reduce

An

recommended.

factory.

2.

It

(27)

and

Tra_de-mark

described

listed time

in

the

adjustment

adjustments

required.

it

may

be

the

end play. of

end

play

may be·

to

the of 1/64 the

buffer

ratchet

of Republic

reassembling

below should

for

If

·

will

be

necessary to.

of

Shims should

necessary

buffer

to

1/32

stop,

wheel

the

mechanism,

above. :

tpe

mechanism

be

of

·reassembly.

each

adjustment

text.

to

the

0.010

mechanism

necessary

the

stop (26) inch

teeth

Steel

add

ratchet

to

0.020 of

be

to

add buffer

between the

when

extending a

Corp.

obtained

the

checked

·

has

to

check

shims

wheel

to

provide a

pawls

reverse

is

sh~uld

been

shaft

an

from

stop

pawls

max-

the

at

The

in-

the

(13)

inch

are

FIELD

Fig.

AKF· MECHANISM (Fig.

The Type AKF

with

field

pole. When

discharge ternal generator the

field

Fig.

16

DISCHARGE

CONTACTS

16 (4_15A845)· Typi~al connection

discharge contacts close, thus connecting

discharge

or motor.

discharge

for

a typical

.

breakers

this

resistor

DISCHARGE •

RESISTOR .

FIELD

WINDING

17f

.

are

contacts placed in the

br~aker

When

contacts

circuit

two-pole

is

·opened, the

across

the

connection.

the field of

breaker

are

opened.

diagram

breakers

center

field

an

ex-

the

is

closed,

See

19

Low Voltage

Power

Circuit

Breakers

GEK-7303

1. With

plate freeing-.;

increased,

if

adjus tap lower

Tighten

Then bolts

the

will

_

means purpose. as

frame

FRAMES).

(10) of

bolt

_

2.

.

If

center-pole

move the

it

is

to

3.

After

tment

plate

adjustment

edge of

bolt

form

are

NOTE: it

is

If

this

as

described

4.

range

be

locking

securely

If

necessary to-

is

outside

If

proper

of

necessary

of

the

In

follows: ·

a.

Separate

(see

SEPARATION OF FRONT AND REAR

outside locking

be

proper

until

the

poles

open,

center

pole

tab

and loosening

wipe

or

on

adjustment

decreased,

adjus

bolts

plate

slot

in

lockwasher

tabs

held

tment

until

such

plate

over

in

place.

move

plate

to

is

above adjustment

in

POLE

recheck

the

prescribed

the

UNIT

loosen

crossbar (9) by

overlap

plate

it

is

made, tighten

is

a way as to

bear against fully c

bolt

heads

has

outer-pole

limits,

ASSEMBLY.

wipe cannot be obtained within

the

adjus

tment

to

obtain

vertical-shims

order

to

the front -

described

further

(14) provided

accomplish

frame

adjustment

this,

from

adjustment

bolts

to

snu

(11).

is

to

the left;

the right.

g.

Then

bring

bolt.

ompres

so

been

made,

wipe.

correct

above,

for

proceed

the back

be

sed.

that

it

by

the

contacts.

5. Check contact

adjust

Movable

1.

if

necessary

Contacts

Remove

(Fi

CHER).

2.

pins

to

Remove

(7) and (16).

3.

Drift

pins

free

movable contacts.

4.

Reassemble

contacts.

5.

Check contact

adjust

if

necessary

overlap

(see

above).

g. 17)

arc

quencher

tru-ar

c re

(7) and (16)

in

overlap

(see

above}.

tainers

to

reverse

,---

,-----

anc;l

wipe, and

(see

ARC

_QUEN-

on

right

side

the.left

order

far

enough

with new

and wipe and re-

--

---

9

--a

----

,--

---

- 7

- 6

re-

of

·

b.

Loosen -screw

c.

Remove

wipe; add

d. e.

Adiusting

Contact

to Replace Reassemble

Center-pole Open

G_ap

Improper

may

1.

2.

be adj

Loosen

If

gap is

(14) should

they

should

sliding

them are ·slotted j1.:1stmen~

3.

Contact

-

Stationary

on contact wipe and

Ti

ghten

Replacement

Contacts

1: Remove

2. Remove screw

3.

Drift

(13) and

vertical

increase

bolt

(Fig.

17}

open

contact

usted

screw

to

be

remove

be

added. Shims

to

the

for

eas

y r_emoval. (Effect

shims

•.

(i5)

and· tig

front

and

back

gap

by -the following procedure.

(13) and

increased,

·d, .

If

it

front

of the

overlap

hardware.

·

(Fi

g.

17

)

- .

arc

quencher (see

(5)

from

out

(4) and

remove

(14) to

hten

frame

of

bolt

horizontal

is

to

may

bolt

screw

.

the

center

(15).

be

decreased

be

removed by

decrease

shims

breaker.

of

this

is

negligible.)

ARC QUENCHER).

braid.

remove contacts.

(15).

(13).

pole

They

ad-

.

Fig.

18

-

AK

,

BREAKERS

The

auxiliary

various

opened and on

the

left

(4) moves, with the

position

an

operating the operating through

the

of

cams

auxiliary

the

switch

breaker

contacts (closed when

Repl~mmenl (Fig. 18)

(0133C9020) Auxiliary .

·

-standard

AUXILIARY SWITCH

(Fig,

18)

switch

control

side

closed

of

circuits

, The

thefrontframe

breaker

is

used

as

auxiliary

contacts,

it

operates a triangular

rod

· (5).

shaft

located switch

are

is

open) and the bottom

The

(8) of the

on

this

auxiliary

contacts.

"a"-contacts

U1e

broako

r---

- - - 5

,----

switc~

4

linkag-e

-

to

make and

the

circuit

switch

. As the

to

the open

link

triangular

breaker

is

mounted

crossbar

or

closed

(6)

through

link

rotates

break

switch, which,

shaft, opens and closes

The _ top terminals

(open

terminals

;r

is open).

when

are

the

"b"

is

4.

Reassemble

in

reverse

ord

er wi

th

new

1. Disconnect

all

leads

to

auxiliary switch.

21

GEK-7303 Low Voltage

Mounting Bolt

1.

2.

Tie Bolt

3. Shaft

4. Screw

5. Bottom Cover

6. End

Plate

7. Top Cover

8.

'a'

9.

10.

11.

Contacts

Contact Spring

Rocker

Arm

.

12. Cam

13. _'b' Contacts

14.

'b'

15. 'a'

16.

Terminals Terminals

Bar.rier

-

Power

Fig.

Circuit

- 2

I

· 5

Breakers

3

4

19 (242C588) Auxiliary

8

--

7

10

II

12

- 6

13

switch -standard

breaker

,-----

,h·+-r

---

JS

- - 15

14

2. Remove two mounting

· ·

Fig. 20 (0133C9019) Auxiliary switch linkage

3.

Diseng~e

triangular

4.

Set arrow on new

- .

5.

hole

Push auxiliary switch

in

link (breaker open). _ ·

link (6). ·

auxiliary sw~tch

6. Replace mounting

Adjustment (Fig.

The

"a" close close.

before the arcing

This may

18)

·

contacts of the auxiliary switch should

be

checked by slowly closing

- 2.SWITCH MOUNTING

bolts.

auxiliary

shaft

hardware

contacts

2

3

I.PIN

3.AUXILIARY

4. CROSSBAR .

5. OPERATING ROD LINK

6.

7.

BOLT

8.LI

NK

9.LOCK NUT

shaft

(8)

from

switch

(8) into

shaft.

square

and wiring.

of the

breaker

SWITCH

the

BOLT

SHAF

T

10

. L I

NK

II.

TRIANGULAR

12.

LINK

breaker

set

vanced the

with restraining across

The

closing of the .

or

external The length justed

the

The so

frame

crossbar

so

arcing

operating

that

it

center

(4).

locating the

·

the

operating rod to

LINK

--AKF

the

"a"

retarded

of

that

contacts

rod

is

parallel

breakers

maintenance handle, with the

the closing

terminals

springs,

of

"a"

. contacts

and with a

the auxiliary switch.

by extending length of the operating

the

switch '.

should

are

with

the

rod

'a"

parted

also

be

the

sides

operating

(5) should

contacts

by

1/8

aligned

of

channel and J?erpendicular .with

This

alignment

washers

the

may

on

the

crossbar.

be

secured

which

can

be

or

·reducing rod

be

close

to

1/4

vertically

the

breaker

by re-

connects

safety

bell

ad-

(5).

ad-

wh.en

m.

the

.

AKF

BREAKERS

.

The . auxiliary

on

the

.AKF

standard the

difference

the

AKF

to

the

switch.

the

linkage· of

the

principle

When

the

crossbar

fixed

mitted linkage breaker this

R

center

mechanism ·through

epla

ceiMnt

1.

2.

-

(Fig

. 20) .

breakers

AK

breakers.

in

switches

mounting

There

the

to

comprised

position

(Fig.

Disconnect

Remove

position

is

the

of

breaker

(4)

(1).

the

auxiliary-switch

20)

mounting

switch

are

the

rotated also

AKF

operation

rotates

This

of

indicator

all

mounting and linkage different. from Figures

mounting

90

of a s~ight bre·~er. switches,

operates,

triangular

rotational

links

link

leads

..

bolts

that

of the

17 and 19 show

positions,

degrees

the

difference

remains

(10), (8) and (6). The

is

(12). ·

to . auxiliary _ (2) and (7).

with

standard

the

the movement of

link

motion

shaft

also

(3) by the

operated

with

respect breaker between

however

same

(11) about

is

trans

by

switch.

-

Low Voltage

··

through

(1)

contacts opens the is

given. When a closing

is

energized

charging breaker. switch

.

to

closed

motor sequent normally the

closing

should

and removing them

is

its

original

and

to

closing

motor

springs

If

the switches do not function

be

Power

the

operating

and closing

motor

. the closing

When the

again

switch

charge

open

circuit

replaced

circuit

through .

mechanically

position with

(3) open,

the

operation.

auxiliary

to

with

the

from

Circuit

rod

switch

breaker

closing

prevent

by

Breakers

(4),

switch

until a

signal

springs

operated,

switch

thereby

Most

contacts

breaker

disconnecting

their

thus

opening

(3) .

contacts.

closing

is

given

the

(3)

contact,

and

closing

closes,

springs

breakers pre-charging

closed.

mounting

the

(1)

contact

allowing the

for a sub-

in

series

properly,

the

GEK-7303

switch

This

signal

motor

further

the

cut

-off

reverting

now

have two

with

the

they

wiring

bracket.

3. Withdraw

4.

ing Fig

Adjustments

be when parted

checked

standard

rod (see

describ~d

Insert

up

and

. 18.

5.

Replace

The

adjusted

the

by 1/8

may

Fig

new

towards

(Fig.

20) _

auxiliary

so

that

arcing

to

in

the

breakers

be

varied by. changing dimension

. 19)·

for

and

t!_le

ELECTRICAL

AND

· A

provided

CLOSING SWITCH

on provided switch. to

the

CUT.;OfF

CONTRO~

closing

for closing

The

closing

the

front

in

Remove the

switch.

SWITCHES

switch

button, when

frame

the

escutcheon

auxiliary

switch

the

_mounting

switch operating

the

contacts

1

/4

same

. T

aligning

standar<:I

switch.

with

back

switch

of

in

. -.

This manner he

length

~reakers.

·

arrowonshaftpoint-

of

the

breaker

hardware

"a"

the

and wiring.

rod

(5) should .

contacts close

outer dimension may be described

of

operating

poles

the

operating

CLOSING DEVICES

and

motor

the

behind the

to

escutcheon

(Fig.

21)

mechanism

breaker

provided. is

escutcheon

allow

-

electrically.

mounted

. A hole operation to

gain

as

are

for

the

"a"

rod

as

are

of.the

access

in

CONTROL RELAY

is

The

of the

the

motor

and holding

I

.:

L

Fig.

21

(242C599)

1.

'G

' Switch

2.

Insulation

3.

'F

' Switch

4.

Rod

control relay ·

front

frame.

circuit. screws.

-

--

-+--

cin

_j

..

- ..

· 6.

8.

is

It

To r epl

See item 3, Fig. 2. ·

---

=r--

-,..

---

'-

Motor

5.

7. Mounting

mounted on the

is

cut

Retaining Ring . Lever

Cover

used

ace

8

7

6

-off switch

Bracket

-

left

side

to open and cl

. remove wiring

ose

The

side

of circuit tained charging charging operated

.through the cl

motor

the

front

is

energized

the

stroke

by the

cut-off

frame

osed

closing

the

cut

charging

switches

. When

the

motor

contacts

springs.

-off

switch

of

are

mounted on the

the

breake circuit is of

At the end of the

is

the

r control

main-

switch

(1), thus

mechanically

springs

and

PROTEalVE

STATIC TIME

TAGE

VOL

(Fig. 22)

The

Static Time Delay Undervo

TRIPP

DEVICES

DELAY

ING ·oE·

UNDE

v1cE

lta

.R-

ge

Trippi

ng

GEK-7303

Low

Voltage Power

Circuit

Breakers

Device consists

on the sepa

bre¥er, a static

rately from the

2

3

4

5

6

7

of

an undervoltage device mounted

time

breaker

delay box mounted

and a control power

transformer 208V

AC

if

or

230V, AC.

the voltage

0102C3698 (Fig. 23).

14

13

12

II

10

I.

SPRING

2.

BRACl<ET

3. ADJUSTING

<t.

SHADING

5. ARMATURE

I .

COIL

7.

9

8

CLAMP

8. MAGNET

9.· SCREWS PIN

10.

II.

ADJUSTING

12. LOCKING.

13. ADJUSTl~G SCREWS

14.

TRIP

Refer

RING

.

WIRE

PADDLE

is

other

to

PLATE

SCREWS

ANO

CLAMP

wiring

SCREW

ANO

than

diagram

D.

C.,

. • l I

i

- • J I

c

""'

"°"'

•'" I

:~-:.1

--··••1

... .._

A • t t • Y.

c..c...

c •• c._c

C,

·

ffe,4

c, ..

...

., , ..

0.,0-..

Pr..o.. ....... , ...

•

..

. ,

...

-.".,,..

.,. ,,

...

, ....

.. , •

Ca•UtoA

..... o.,,.-...

~ ·

St0A

Fig.

23

Fig.

22

(0133C9023) Static Time·-Delay Undervoltage Tripping Device

I

'•

L _

k.

,.,

...

••

,..,

t,

ff..__.__,__.

•C..•'t'

•.

.J

•.-1 ,

..

"

'-••"""'P<

........

· ·

,

JU-.c

.,

....

'""

. ,

04 "'·

l • w

\

\-.,

• f

_""

t.t"lti,.

r-

.

-.

,.

•flt

lrt.

(0102C3698) Static

Time

Undervoltage Wiring Diagram

Delay

The

voltage 208V tored the the

is

connected to time delay breaker

is

box. The undervoltage device on

always connected through

secondary disconnects

mi

nals

#4

and #5 of the

The

undervolt~e

approximately

between

30%

Soto

and

The u.ndervoltage device coil

tinuously

as

the voltage

drop

rated

out

voltage. The justable between 1 and 5 seconds, set

at

the mini

delay

be

is

No

more

co

nnect

The S

establisher.,

than

ed

to a

tatic

Time Delay ·Undervoltage can

be furnished in conjunction with the

. co ntrol package,

AC

or

230V

AC~

to

Terminals

or

terminal

time

device

of

bus

#1 and

board, to

delay box •

is

set

to pickup

voltage and drop out

60%.

circuit

and will

remains

m"Qm

remain

picked up

above the predetermined ·

time

delay

it

is

setting; and one~ the

it

is

con

sistent

•.

one u.ndervoltage device ·should :

static

time

delay box.

thermotector

as

sh

own · on wiring 0102C3699 (Fig. 24). Overheating of the windings the

motor

causes

windings,

the

thermotector, to

open and allow the

imbedded in·

be

moni-

#2

of the

either

ter-

· is

con-

as

long

field ad-

factory·

time

also

diagram

motor

'!2"

its

at

·

Low Voltage

Power

Circuit

Breakers

GEK-7303

relay breaker in on the

series

--,

_Ji

c

.,,,-u)

~~

"'-:;:~II

Fig.

of the "

control

through .a

box

to

instantaneously

normally

closed

with the undervoltage device mounted

breaker.

r--'T-~-.

I

J

~:

I

L_

.,,.,.,,....._.......,

A•

llflfll(.

•UAr

C,J!.,,(I.Cc,CJ•lf-''•

,

..

C1•

IH,1

,, • ..,,...,t

4.,"1.4.lt·

'6t

.(; •

/JA

,t,•1H!f•tw•JI

.t

,71A

1

'

,,,,,

..

11<

IIHWK

,,,t,(!f(/1(

,,,,,,.

...... • )

••

(.

Jt,/flj,

$t,1US

24 (102C3699)

~,•tJS.A

JrOVt'U,

b •

O•IM

1'W

At•,_.,,,.,.,

4',C,•#A

,.

T•

X•

I• 11v11c Kl.&Af

t

lhl.

,.,_,.,"'-Ar~

1.-t~,-,.N<,-.

..

_,.,.

Jllf1U"Pb,•)fl

J~

.

)SN,,,_

Thermotector

· ·Diagram

"Warning":

. tinuity

box, only a volt-ohm volt

In

the· event the device·

following checks

Do

of

meter

not

use

bell

set

to

bridge

circuit

meter

in

static

or

should be used • .

fails to_ pick-up, the

are

recommended to· determine whether the magnetic device on the the

static

A.

time

delay unit

- ·

check

2 on as

1.

input vo1tag·

static

box. These voltages should be

follows: ·

- Device 177L316 G~12-208

A.c

• .

is

es ·across

the faulty component.

terminals

trip

"Z"

contact

..

Jlc..

Wiring

check con-

-

time delay

vacuum tube

breaker

1 &

or

230 volts

the

or

The

.. c.

REPLACEMENT

resistance

are

as

follows: . ·

1.

6275081 G-59 - 1830 Ohms.

2:

6275081 G-61 -.440 Ohms.

1. Disconnect coil

2. Remove four mounting

of the under voltage coils

leads.

screws

remove device.

3. Install new device in

Coil

(ls)

1.

Disconnect leads to coil.

..

2. Remove two

3.

Re~ove

4.

Straighten laminations around shading

screws

magnet and coil

·(5).

· 5. Remove shading ring and

reverse

(16).

assembly.

order.

straig

end of coil _clamp (13). .

6. ·Remove· coil. Install new

order.

· INSTANTANEOUS

VOLTAGE TRIPPING

· ·

-

UNDER-

DEVICE

coil

The instantaneous undervotage device in the delay

same

location and manner

_.

d~vice . and.

its

construction

as

the

. .

The adjustments and re_place~ent of are

the

static

time-delay undervoltage device.

UNDERVOLTAGE

same

as

those described above-

LOCKOUT

(~ig.

25)

. ·

(21) and

ring

hten lower

in

reverse

is

mounted

static

time-

is -similar.

this

device

for

the

DEVICE

B.

2.

Device 177L316 G-14-125 volts D.C.

G-

3. Device 177L316 Check output voltages on

with

the

under

The

approximate voltages

1.

208 Volt A. C. . 177L316 G-12-

voltage device connected.

-15-250 volts D.C. terminals

are

as

Volts D. C. 230VoltA.C.

177L316G-12-120D.·C.

Volts D. C.

2. 125 Volt D. C. 177L316 G-14

D.

C.

3.

250 Volt D. C. 177L316 G-15Volts D. C • .

4 & 5

follows:

110

50

Volts

100

The undervoltage lockout device holds breaker energized. · When the

position, ~inkage operated by the

anism

trip-free

when the coil of the device

breaker

is

breaker

cam

positions -itself to mechanically hold ·

the undervoltage device armature

air

gap position to prevent tripping the in the event the undervoltage device energized. This feature

when

used in conjunction

in

an open

in

the closed

mech-

the closed

breaker

coil

is

with normally-closed. aux:Uiary contacts of alternate of mechanically interlocking two to

assure

at

the

The undervoltage lockout device

the right side of the mechanism from the front). This device standard instantaneous

breaker

same

that

time.

presents a convenient method·

or

more

breakers

no

two

breakers may

frame

is

unde~oltage

be

is

mounted on (7) (looking

identical

trip

closed

device,

to

de-

cie-

an

the

GEK-7303 Low Voltage Power

Circuit

Breakers

3

4

5

6

7

UNDERVOLTAGE

· · TYPE AK-50,

Fig.

25

(8039985) .Right

-

frame

Breaker

1. Mechanism cam

2. Undervoltage lockout

3. Undervoltage lockout

4. Undervoltage device

LOCKOUT

75

side

DEVICE.

& 100 . . .

view of mechanism

shown in open position.

·· arm

lever

armature

5. Undervoltage cjevice.

6.

· Undervoltage lockout

7 •. Mechanism

frame

spring

with the addition of the lockoutfeature. The lockout feature

consists The lockout linkage the mechanism cam (1). When the the undervoltage device holding the tion. When the

moves down, allowing spring clockwise which clockwise to

undervoltage device to

DIRECT

DEVICE

(USED

a direct-acting device

breaker

a

the magnitude . of the

EC-lB a

teristics,

are

ON

. The type

with which

predetermined

tripping device can be constructed to s·upply

variety

of different types of

long

time

of

armature

breaker

causes

release

ACTING

EC-1

AK-2-75

either

B (Fig.

EC-lB

time range which .depends upoq:

alone

delay,

arm

(2),

lever

(3), and spring (6).

is

activated by the movement of

is

defeated by the

(4)

in the

breaker

closedairgap

is

opens, the mechanism cam

(6)

to rotate

lever

(3)

to rotate counter-

armature

operate

(4)

allowing the

normally.

TRIPPING

26)

AND

AK-2-100)

overcurrent

that

it

is

associated to open within

current

or

short

time

tripping device

causes

the power

overload. The

time-current

in combination.

delay, and instant-

closed,

lever

posi-

arm

circuit

charac-

These

(3)

(2)

is

aneous, and they numbers broken

general

and minimum are

and characteristics

The

· taneous of the

Low-set

Irqm

current

used,

1, 2 and

down within

classifications

values

coded resDectivelv

current .relationships

are

EC-

ll:3

is

tripping.

EC-lB

is

shown

· instan~aneous

bO

·

percent

it

rating

is

of the device. ·

the

only

Instantaneous tripping

other

any

. When

characteristic

armature net (11), motion anism linkage, rotating connecting the

breaker. results anism trip

open • . Long and·

is

achieved through

described

SHORT

rod

(10)

· By

in

the displacement of

trip· latch

below:

TIME~DELA Y TRIPPING

. (Fig. 26) .

The

ed

by a

close

to

is

great

_ the

speed

cal

escapement

(2>,

(3),

LONG

TIME

The long by- the long After

current

short

the. magnetic

time

calibration

the

armature

enough

of movement

(4)

and (5). . · .

DELAY .

time

condition velocity of the by the flow of

oil 6f the dashpot (17). the

piston

tending to

INSTANTANEOUS

High-set, Non-adjustable

When

instantaneous

generated eous

.

If

the.

instantaneous ·

the

force

device

the

front

fastened on the

. .

High-aet, Adjustable-EC-1B

is

inversely

close

TRIPPING

an

overcurrent

trip

is

great

spring

(21), tripping the breaker-

overcurrent

spring

to the

has

only the instantaneous

end · of ~pring

frame.

the magnetic

· Adjustable instantaneous

ed by

varying

the amount of

are

identifred

3.

Characte1'istics

each

of

the

first

respectively

into maximum,

of the

time

delay

..as

· AA.

Bl,3

for

given by

adjustable

The

adjustable

in

Fig.

the

curve

on

26.

drawing

high-s_et

setting

tripping

to

250

percent

of

Whenever

characteristic

used

(1

or

is

transmitted

is

pulled

means

is

always

22)

closes

tripping

of

trip

in

conjunction with

high-set.

ag.ainstthe

through

link

towards

paddle

the

which

delay

spring

to

mechanism

TRIPPING

delay

overcomes

armature

through an

causes-the

short

separate

armature

(6).

against

overcome

is

governed

armature

calibration

force

produced

movement

The

time

timing

(1)

If

the the

the

by

_cons_

isting

.

(Fig.

(22)

this

orifice

required

proportional

circuit

(Fig. 26)

is

of

the

magnitude of

setting, the magnetic

enough to extend the

is

below

acts as· a

other

this

control

(21)

is

. value,

link,

elements.

hooked onto a

·

tripping

tensile

by

are

further

two of

these

intermediate

period.

and. CC.

various

These

Tjme

device

2 89B 198.

instan-

mechanism

is

adjustable

the

·continuous this

of the device.

mag-

the

mech-

(8)

so

that

..

the

rear

(14)

this

breaker

mech-

breaker

to

delay trippi!lg

devices

is

restrain-

force

magnet

spring

the

mechani-

of

as

tending ·

(11)

force,

parts

26) is

restr:µned

spring

by

restraint,

is

in the

(15).

the

over-

.the

governed

piston

to displace

to·

the

force

.

the

force

instant-

instantly.

the

heavy

transmitting

·

If

the

characteristic,

is

accomplish-

force

on

the

is

·

of

Low Voltage

Power

Circuit

Breakers

GEK-7303

high-set

netic force armature

(24),

the

The

the

times

15 appear v

alue

by

6.5X - 9X)

15X), depending device

instantaneous

force

is

thus

greater

produced

(22)

is

tripping

than

by

an

pulled upward

the

breaker

connecting rod (13)

pickup value of

following ranges: 4 to

coil

on the

of

these

stampings

rating.

calibration

on

or

Three

calibration scale

the {6X -9X on

the

at a particular clamping nut (20) and on

the

calibration lines on

adjustable

place

tion in

up horizontally with the

the

calibration

low-set, Adjustable

If

the

characteristic

instantaneous, a link

of

spring

Fig.

is

26. Dashpot (17)

washer (l~!

scale

(21).

and th_e instantaneous

located

spring

(21). When a mag-

the

restraining

over-·current

against

by

the

against

the

the trip paddle(l4).

device

9,

calibration

marks

scale

will

as

- 12X)

desired

pickup

slide

range.

value

the

LO

desired

(18).

of the

where

device

~prin_g

isomittedfrom

spring

condition, the

the magnet

moveme11t

may

have one of

6 to 12,

marks

(18) and

be

follows:

or

{9X

To

, loosen

index

indicated

of

or

9 to will

the

(4X

- 1

2X

set

the the

pointer

a position which

pickup value

is

low-

set,

is

installed

in

calibra

(15}

is

shown

assembly.

2. Remove clamp (19) by loosening locking

nut and unscrewing

3. Remove

4. Remove two

to

is

-

stud

-

the disassembly.

lower

5.

When

stud.

Device

is

accomplished by

reassembling

, be

sure

to

same

location

If

consequent malfunction may

ADJUSTMEN

TS (Fig. 26)

Before the EC

brated

{11) and

gaps

the o-ap

and

Both have a

at

are front for

the

for

the

factory,

armatures

measured

edge

of

short

the long

plus

stud

now

slotted

(23)

screws

.

free

revers

stud.

fastening

of

breaker. ing

the magnet to

replace

in

this

any

which they

is

not done,

result

-lB overcurrent the

air

g-aps

(1

and

at

their

widest

the

armature

time

delay

armature

time

delay

armature

and minus

Reassembly

the

procedure.

spacing

were

found during

misalignment

.

device

between

22)

are

set.

point, between

and magnet.

is 17/64 in.,

tolerance

magnet (11)

the

lower

washers

in

and

is

cali

magnet

These

The

is

17/64 in.

of l

/64in

-

.

REPLACEMENT

(Fig. 26)

1. Disconnect

rod

(10) by taking out

coupling

.

trip

paddle (14) and connecting

cotter

2

3

SHO

and removing

.

•

+

RT

TIME

II

10

9

8

7

6

5

4

The

is

and occurs, true

.

they may

15

16

air

gap

setting

not to be attempted in

the

If

any

be

HIGH-SET

calibration

due to the

.

--

l t

EC

-I B a

of.

difficulties

fact

~

. , . I

i I ·

-rttl

.

!

_l.l..i

ADJ

.

INST

.

is a factory

the

field.

the

If

device

are

that

the

air

24

23 22

21 20

19

18

17

adjustment

any change

will not be

experienced,

sap

setting

I.

S. T. 0.

AR

2.

PALLET

3.PIN

4, ESCAPE

5. DRIVING

6. S. T.O. CALIBRATION SPRING

7. S. T.O. TRIP ADJ.

8.

MATURE

I ON

WHEEL

TRIP LINK

Fig

SEGMENT

. 26 (Ol33C9022)

9. AIR

GAP

10.

II. MAGNET

12.

13. CONNECTING

14

.

15

. L.T.O.

16. CALIBRATION CLAMP

AOJ.

CONNECTING

LOCK

HUT

TRIP

PADDLE CAL

IBRATION

Direct

ROD

-acting tripping device EC-

SPRING

NUT

ll

OASHPOT

18

. CALIBRATION

19. CALIBRATION WASHEii

20

.

CLA

NPINO

ti

. INST. CALIBRATION

22. L.

T.

O. ARNATUIIE

23

, ST

UD

24

. N

AON

ET

NUT

SCA

LE

lB

SPIII

NO

27

GEK-7303 Low Voltage

has

been

altered damage . If a check of reveals

t>ha

t the setting

the device should be

for

recalibration.

The

adjustment

the

short-time

link

(8)

at

by

the before the

see the screw

lollg'-time mechanism . .

the connecting link (10) and checking that

trip

long

time

(7).

After

the

mechanism will

the

same

device

is

link

linkage and

device ·

Power

by rough handling

the

is

returned

screw (7)

point .

at

mounted by pulling

(8)

contactsboth

is

~ounted

Circuit

air

gap

beyond

is

pro.vided so.

pick

which

This

the

· end of

-on

Breakers

or

shipment

measurement

the

tolerance,

to

the

factory

·

up

the

it

is

picked

may

be

checked forward visually

theset

adjustment

the

breaker,

that trip

up

on ·

to

in

-=

-

a of ing the which

mate dis of The

just ature with

making

center

connecting

-:

final

adjustment

the

connecting the connecting

ties

tance

the

connecting

correct

cause

is · closed

the

this

1.

Before

distance

amount

onto

between

exact

tripping

magnet.

adjustment

mounting

rod

at

that

must

be

rod

(10).

of

thread

rod and

the

trip

rod

This

the

paddle

the

pivot

assembly

distance

of

the

breaker

to a point 1/ 32

A

step-by-step

follows.

the

between

six

the

inches

. ·

made

is

made

engagement

insulated

(14) •.

The

centers

is

six

is

that

which

when

in.

short

procedure

trip

device,

pivot

centers

the

length

by

vary

between

coupling

approxi

on

the

inches

the

of

contact

set

of

ends

will

arm-

for

the the

-

.

2

3-

---''0":

~~~~~';:;;;I

l(ff

Sl«»T T

SIC[

111(

VI

OEUT

Ei

SHOWl!ili

ll{0'.,1111

SIi

-

8

7

6

5

4

10

.

I I

12-_

--!!,!--+-ii'

13---ltt-w..._..JA,.

.:

RI

GIII

SIC[

Vl(

'I

CCl

Slt>IIIIG

AT

l!(Q;.ul1Sll

l<ING

TIM<

Fig.

27 (P-6423678)

1.

Series

2. Magnet

3. ·

Pallet

4.

Pinion · 11.

5.

Escape

Coil

10.

Wheel 12.

8.

9.

6. Driving Segment 13.

7.

S.T.D.

Armature

14.

Series

s.

T .D.

Calibration Sprin

Trip

Paddle L.T.D. L.T.D. Inst.

Spring

Armature and Low-

Trip

Holder

Calibration

FRON

T v I

(W

SHOW I HG

l()UHT

ING

BRACK(!

overcurrent

Adju~ting

··

set Inst. Calibration

Spring

(High Set) 19.

Clamp

Nut

tripping

g

Screw

device

- EC

-1

Spring

(AK

- 50 only)

15.

16.

17.

18; 2Q.

Plunger Cylinder Calibration

Trip

~addle

Trip

Arm

Clamping

Plate

Bracket

Low Voltage Power Circuit

Breakers

GEK-7303

·2. Mount the device as

placement and

connecting

3.

Olos~ the

gage

1/32

insert

rod

and the

breaker

in. thick between the magnet. . This should of the

. wider · than

. ·

4.

Close the

breaker.

1/2

The

in. and

armaµire

the pin which couples the

trip

described

paddle.

and

insert

armature

be done

feeler

at

from

gage should be

least

4 inches long.

agailµit the gage and

under

a feeler

. the

re-

and

rear

magnet. ·

5.

· If the

14

to obtain positive

6.

Check visually to make

connecting

of the

anism adjust

breaker

resets.

its

not interf

thA

overcurrent

SERIES

"TRIPPING

Each enclosed screws

~t

pole

The devic.e · can .

tripping combinations

breaker

does not

trip.

rod

does not

trip

latch

·

It

should always

lelllrth to a

erred

with and

device

DOint

is

OVERCURRENT

DEVICE

series in

and a

}?ase.

overcurrent

a molded

bracket

case

to the

be

provided with the same

as

trip,

form

sure

restrict

when the

yet

the

engagement

breaker

be

possible to

where

resetting

positive tripping by

achieved.

EC•1

··

(Fig.

tripping device

and mounted

the

lower

EC~.1

part

direct

paddle

· .

that the

mech-

27)

by

three

of the ·

acting

-device.

SHORT

(Fig. 27) . . .

brating produced by

~

this

is

ism acteristic.

TIME-DELAY

. The

spring

restraining

further ·retarded

which produces an-inverse .

. . - . .

LONG

TIME-DELAY

TRIPPING

armature

(8). After the magnetic force

an

overcurrent·conc:Ution

(7)

is

force; the ·

restrained

armature

by an escapement mechan- .

time

The mechanism

TRiPPING

is

shown on Fig.

. .

by

cali-

overcomes

movement

delay char~

27.

(Fig. 27) · . · . . ·

The

armature

(10)

is

restrained

by the · calib-

ratio~ spring (11). · After the magnetic force

produced by an

this

restraining

is

further

·

overcurrent

force, the

retarded

condition armature

overco~es

movement

by the flow of silicone oil . in a dashpot, which produces an inverse time delay·

characteristic.

The· mechanism

is

shown

on Fig. 27.

force of a non-adjustable spring.

.

ADJUSTMENTS

the desired pickup

no

. To adjust

travel

JUSTMENTS

screw not touch the

"open". Adjust positive

(See page

trip

is

REPLACEMENT

·

OF

-lower stud.

travel

(Fig.

27)

Calibration clanu>ing nuts (14)

tor

..

. .

for

approximately

of

trip

arm

(19)

1. Check trip latch ·engagement. See

- OPERA

2.

Loosen the locknut• and

(9)

on

the

trip

the adjustable elements .

after

tripping:

TING

arm

MECHANISM.

(19). The

paddle when the .

trip

33 ). ·

3.

Tighten the adjusting

screw

are

used to

1/32

turn

the adjusting

screw

breaker

same

locknut•

arm.

•

NOTE: equipped with self-locking nylon

In

Ueu

of loclmuts, some devices

insert

(Fig. 27)

1. Remove front

FRONT

2.

3. Remove

.

4.

AND

REAR

Remove the bolts holding the coil to the

bracket

· Before

of the

installing

trip

frame

(see

SEPARATION

FRAMES).

. and mounting screws.

a new device, check the

arm

with a

rod

or

set

in.

over-

AD-

should

is

as EC-2A

on

the

are

nuts.

.

wire and

INSTA~TAN.EOUS

·

(a)

Adjustable instantaneous tripping takes place

after

current

the magnetic

condition, overcomes. the restrainingforce

of the calibration

by

the calibration clamp nut (14). .

(b)

· Non-adjustable instantaneous tripping takes

place

after

overcurrent condition

TRIPPING

{Fig. 27).

force

spring

the magnetic

overco~es

produced by an

. which

force

can

be

produced

the restraining

adjusted

over-

by

an

Fig.

28

(8016188)

of

series

Checking

travel

distance

overcurrent tripping device

GEK-7303 Low Voltage

push

(see

the ·armature

Fig.

28). The

solidly

trip

5/32-in.

5. Replace. new devi9e

Power

arm

should

Circuit

against

travel

in

rever.se

Breakers

the

magnet

at

least

order

6.

Adjust

NOTE:

tripping be

.

necessary

are

worn

device

Component

devices

or

are

to

install

damaged.

as

described

parts

not

a new

•J::-:

~···1·

·.

~~

.'

··-

above.

of

any

replaceable.

device

;:~

•

overcurrent

It

will

when

parts

..

.

~

...

.....

·'."4;

.

..

. .

.

.'.:.,

Fig.

29 (8024843, 801449, 8019485)

Overcurrent

tripping

device

EC

- 2

SERIES OVERCU~RENT

The

current

Type

tripping device

EC-2,

EC-2A, (see

is

available in

Fig.

. . .

TRIPPING

29)

over-

three

forms: the

Low Voltage Power Circuit

DEVICE EC-2~

case, which

trip

unit

~ay

itself.

be

taxen

Breakers

..

EC-2A,

off

without disturbing

GEK-7303

AK-SO

·

1.

Dual

overcurrent

and high-

2. S.

The instantaneous 12ick-up settings and adju~table time settings

adjustable pick-up settings.

LONG

AND

TRIPPING

By means of the adjustment knob (3), whicb

can

I

point can

series

plate (2) on the

of indicating the pick-up point setting

I

percentage of coil rating. The calibration indexed at. percentage settings of 80, 100, 120,

1140, and 160.

· As the with any one of

I

which imum, operating bands. These

lB and 1 C

I

proximate tripping same percent of the pick-up value time-current

I

The tripping limits shown on the ing

I

clockwise counterclockwise arm MAX, .as

I

mark on on time indicated.

I

are the 1 C

ard

settings.

set

instantaneous tripping. Low-set High-set

dual

. Both ·

TIME-DELAY

HIGH-SET

(Fig.

be

manipulated by hand, the

be

coil

in

the

long-time

correspond

intermediate

order

the

time

(8)

is

_indicated

the

the dashpot

as

shipped with

characteristic

instantaneous tripping.

trip

forms

INSTANTANEOUS

29)

varied

rating.

front

case

· of the EC-1 over-

delay tripping feature

three

characteristics,

are

30, 15, and 5

characteristic

time

adjustment

direction

O).Otion

index~d

connecting

arm,

shown by the

The

lA

this

curves

trip,

with long-

has

adjustable long-time and of instantaneous

.

from

80

to 160

The indicator and a calibration

of the

time-current

to the

and minimum

time

characteristic

in(?reases· the tripping

at

in

and

at

case

provide a means

NEMA

are

identified

respectively.

for

. each of

of

curves,

may be

screw

decreases

four . points,

Fig. 30. When the index

link(9)linesupwith a mark

the approximate tripping

characteristic

lB

setting

the 1/3

varied

(4).

characteristic

at

the

mark.

are

plotted

time

delay

trip

have~

current

percent

can

characteristics

standards

long-time

seconds

current.

Fig.

curves

it.

MIN-1/3-2/3-

pick-up

in

terms

plate

current

be

supplied

these,

42).

within the

by

Turning

The

dashJ?Ot

curve

devices

2/3

mark

The

at

these

of the

trip,

maxdelay

as

Ap-

in the

at

(See

turn-

in

time;

stand-

same

If the

ox:

. undervoltage device, the EC-

the

cases

INSTANTANEOUS TRIPPING

The l

be

varied

ration

to

250 the 100, 150, 200, and 250 p~rcent of the rating.

INS

TANTANEOUS

TR

IPPING

The high-.set instantaneous pick

have one of the following

coil rating; 6 time by turning the instantaneous pick-up adjusting

of is

screw

Three

the operating

calibration

on the

9X

- 12X)

At the ·factory, the

at

the nameplate value of the

lA,

600

is

and

current. rating of the

up

setting force the adjustment

movable nut (11) on the anchored

position of the nut

- ponding change

a

is

breaker

center

calibration

coil rating. The pick-up setting may be

tightened, the pick-up point

pole

on the ou

{Fig.

2~)

ow-set

by the adjustment knob (3).

in

this

percent

Fig.

(12).

calibration

marks

arm

as

or

(9X -12X -15X)

(Usually expressed in

is

on the instantaneous

to

this

is

provided with a shunt

2,

must

be taken off

ter

poles

LOW

-SE

T

.·

instantaneous pick-up point may

case

usually of the plate indexed

HIGH-SET

29)

to

12

arm

(14)

will be indicated by stampings.

follows:

trip

coil.) The

accomplished by varying the

screw

movatile nut

is

in

the spriI?g load. As the

can

ranges

series

three

times

marks (15) will

coil rating

and the value of

(4X

- 6.5X -

pick-:-up

changes the position . of the

screw.

changed,

EC-2A, .

first

be

removed.

The

from

80

coil

rating, with

at

values of 80,

-u

p value may

ranges: 4 to 9 times

9X)

. .

point

spring

has

inst~taneous

times

variation

so

there

the

(5). Turning

The

that when the

is a corres-

is

increased.

trip

case

before the

or 9 to

appear

or

been

spring

on

calib-

percent

15

varied

on

these

(6X

set

trip

ampere

in

pick-

tensile

is

spring

-

Time effective linkage is greatest. turned by through desired to

marks on the linkage move

the

values length

setting

the one

the

two mounting

are of the dashpot that

at

which dimension ·

The

time

inserting

hole

in

relate

case.

the linkage setting This

screws,

inversely

gives the

adjustment a Phillips head

the

front

it

may be done by removing

proportional

arm.

shortest

11

screw

of-the

will be

one on each

necessary

Therefore,

time

A",

Fig.

(4) may be

screwdriver

case.

to

the

side

to

the the

·value

29;

is

If

it

is

index

to

re-

of the

Fig. 30 (417A464) Time-adjustment indexing

GEK-7303 Low Voltage

2

--

-

------...

2A

28

·3 -

---ll-l~..-----1

4

---,

5

..,..

__ _ _

Power

Circuit

Breakers

1·

--

------iHi-mW ~

8

--

~

<+-l'C::t-~- - - - - - -

A

O I O 0

2 0

o 3 O

0 4 O

B

o I o

0 2 0

o 3 o

C 4 0

(-)

C t

S2

-----,

- 1

ell

L3]

s~.

86

Fig.

31

(383A691, 215D175)

The top edge of the movable nut

as

an index

center

the

to obtain the

trip

The

(7)

should be

trip

paddle on the

between 3/32 in. pole

piece.

91in.imum

its

m

motion

pointer

of the

desired

proper

screw

armature

or

set

less,

(6) so that

and pole measured

Also, the

of 1/32 in. of

at

which the

and should be lined up with

calibration

instantaneous on the end of

it

does not contact the

trip

shaft

piece

armature

travel

breaker

9

1

I

3

1ft

r/ !

~2

1.

i.ux:sw

(11)

serves

mark

trip

setting.

the

armature

until the

is

at

the

air

reduced

rivet

mus t have a

beyond the point

is

tripped.

(15)

gap

t!?

in the

Reverse

current

Replacement

accomplished

for

the

cases,

EC-2A

paddles

longer. the

replacement

1.

Trip

Paddle

Series

2.

Adjusting Nut

2A.

Locking Nut

2B.

Trip

3.

4.

5.

6.

7.

8.

9.

10. 11

.

12.

13.

14.

tripping

of

the

by

the

EC-1

when

NOTE: Pickup the

it

will·

on

the

Wheri

EC-2.

series

trip

replacing

be

necessary

trip

shaft

required

trip

EC-2A device

units • .

device

same

an

with these

Rod

Trip

Crank

Setting

Calibration

Potential Calibration Pole

Pieces

Armature Counter Stop

Screw

Mounting Screw

EC-2,

procedure device: however, EC-1

ones

will

settings

the specific device. When replace

on

associated

device.

Coil

Sealing

Screw

Spring

Coil ·

Nut

Weight

Screw

EC-2A device

described

device with

to

replace

which

be

on

are

an

are

provided with

the

cover

calibrated

replacing

is

in

some

EC-2,

the

trip

slightly

of

for

covers,

·

1

Low Voltage Power

Circuit

Breakers

GEK-7303

REVERSE

AK-50

The device is series

consists

ed between two pole coil

CURRENT TRIPP I

ONLY

(Fig.

is

mounted on the

overcurrent

reverse -current

The

of a series coil

(7)

connected

NG

DEVICE

31}

enclosed in a molded

right

pole

base

simila

tripping device.

tripping device

(2}

with an

pieces

across

(9),

a constant

iron

also

(see

core

case

a potential

source

voltage and mounted around a rot;ary·-type

ature armature

(10). Calibration

pick-up when a

spring

reversal

(6)

determines

of

occurs.

As long

breaker

of the

potential

rotate ration

same

the armature attached to a

is

in

series

coil

the

armature

spring

direction

to

as

the flow of

~urrent

throug_h

the normal direction, the magnetic flux

coil

and the magnetic

flux

produce a torque which tends to

counterclockwise. The calib-

also

tends to rotate the

. This torque

rest

bearing

against the stop

plate on the

right

armature

causes

screw

side

device.

If the

reversed, clockwise calibration

exceeds the calibration setting, the

-

revolves move upwa. by

tripping

ADJUSTMENT

The curr rod

the

point of tripping the

should have

bei_ng

The

· the top end of the in.

above

tional adjust.ments of the

required. travel,

1.

current

the

direction

spring

through the

armature

against the

(6). When the

series

(10)

tends to move in the

restraint

current

coil

armature

clockwise causing the

rd

engaging the

the

breaker.

S

(Fig.

31)

trip

rod

paddle (1),

only adjustment to be made on the

ent

device

has

a minimum

is

-to make overtravel

breaker. This

to

be made only when an old device

sure

that

of 1/32 in. beyond

adjus!me~t

rep~aced by a new one.

new device will be factory adjusted so that

the

To

cl~se

Loosen

trip. rod

top of the device

obtain the

the

break~r

the locking nut (2B).

(3)

will-extend 1/2

case,

trip

rod

proper 1/32

~d

proceed

and

should be

in.

as

and

.r to the.

Fig.

28}

mount-

of

arm-

the

current

the

of the

in

the

(12)

of the

(2)

is

of the

reversal

(3)

to

there-

rev

er~e

the

trip

is

no

addi-

over-

follows:

R

EPLACEMENT (Fig. 31)

After coil the and

for

replacing

wiring,

POWER GENERAL

All AK-3 Type Power Power

removing the wiring for the potential

rever

se

replaced

see

Fig.

current

by following the

the

series overcurrent

31).

device can

procedure

SENSOR TRIP

DESCRIPTION

Air

Sensor

Circuit

Overcurrent

Trip

functions with

Breakers

Trip

Devices.

be

rem

outlined

device.

contain

solid

oved

For

The

state components .with the exception of the Solenoid Trip

which

from

the

Overcurrent

is

used

Power

Trip

to

trip

the

breaker

Sensor Unit. The

Device

consists

on signal

Power

of four

Sensor

major

components.

1.

The

magnetic

conductors (Fig.

32

coils

& 33).

around the

breaker

2. The Power Supply which provides both the tripping energy and the overcurrent

3. pick-up

35}.

(Fig.

4.

the

breaker

detection (Fig. 34). ·

The Power Sensor Unit with the

settings and

The

trip

solenoid which physically

(Fig.

36}.

In addition to the phase overcu_ a ground fault sensing The Ground Sensing Devi that

the instantaneous value of

three

the wire

current system grounded

coil

conductor with

secondaries

mounted on the

conductors (or; in four condu_

sys

tems)

is

Fig.

must add to

flowing. ~

Therefore,

a four wire wye

at

the

transformer,

38 must be included on the neutral

its

secondary combined with the

of

the

three

breaker. the output of the external the

breaker mounted low and the

breaker.

by a control disconnect which

on

the centerline

Refer to Fig.

comparison

time

delay

selection

-

feature

ce

system

phase

On

neutral

rrent

may be provided.

works on the principle

cur

rent

ctors

zero

unless

if

the electrical

with the neut~al

the fourth sensing

sensors

Draw-out

sensor

on

(37)

for Ppwer Sensor

basis

for

various

taps

trips

protection,

flowing in

on

four

gro_und

which

are

breakers

must

enter

is

the back of

Cabling Diagram.

lift

the

trip

rod

2. Manually

. position of

ing the breaker

position

is

NOTE: breaker

3.

With

established,

one

and

one-half

the

adjusting nut (2A}, this establish-

of the adjusting nut where the

just

tripped

Be

parts

this

.

sure

to

keep

when tripping the

position of the adjusting nut

advance the adjusting nut upward

turns

.

and

clear

4. Tighten the locking nut and the mfnimum

1

/3

2-in. overtravel

of the

trip

rod

obtained.

vary

the

of moving

breaker.

should be

MAINTENANCE

When mal-functioning of thePower Sensor

is

indicated, the trouble should be

or

more that following

of

these

four components involved, and

component should be replaced

steps

should be taken to detect a

functioning unit. .-

No

NOTE:

pi

ck-up should be made with the

rying

current

In

the event the Power Sensor Devi

adjustment to· the taps controlling

.

be made non-operative to allow the

traced

as

breaker

to

a unit.

ce

breaker

Trip

one

The

mal-

car

-

must

to

GEK-7303

Low

· Voltage Power Circuit Breakers

Fig. 3·2

(8039647)

Magnetic Coil Assembly.

1. Carrying Fixture · · .. . 3.

2. Power Supply Coil, C.

uz:ren~

Sensor Coil · 4. Disconnect

continue carrying current without overcurrent 4..

it

is

protection,

recommended' that. the leads to fault protection, determine whether the

the tripping solenoid be removed to completely ping

eliminate the possibility of the breaker tripping.

Do

not close

breaker

with power

on

the main determined by contacts while the disconnect plug to the magnetic coils

is

disconnected. · l and 5

current trip back

1. Check · for the existence of overcurrent

or

ground

the breaker to

fa

ult conditions that may

trip

as

a proper response to these

be

causing

normal circuit conditions.

can between them. (See drawing 138B2454) With the ground fault there

2. The possibility of the breaker . being

free by mechanical interferences along the

shaft

or

inadvertent shunt trip operations should

trip trip

FALSE

FAULTY

be positively eliminated before investigating the

Power Sensor. Successful operations in the

test p~sition should be obtained before proceeding with the Power Sensor trouble shooting. ·

(fourth C. T. remotely (Fig. 37) the shielding the disconnect plug external

Test

3. A PST-1 Power Sensor

· available. correct

for

one

point on each time d~lay characteristic. Then .

check for the

(rig.

39). Check the -Power Sensor Unit

function

correct

f<;>r

each pick up setting and

operation of each phase of the

Power Supply Unit. This procedure

in

the instruction manual

PST-1

Test

Kit.

If

the

: not deviate more than

curves~__pz:oceed

.

10%

than

.

ment

contact the factory for possible replace-

of the Power Sensor Unit.

to ·step

test

4-.

(GEK-7301)

results for this

10%

froin the published

If the deviation

Kit must

is

described

be

for the

test

do

is

more

from continuity Check

40.

Unit and check continuity between A and C (Signal).

.

Letters

··

· tween

for

AK-3-50

Transformer

If

·the

is

the

result

trip

or

breaker

a ground

temporarily

Breakers

Taps (In Amperes)

Plug

·· . · . is

equipped with ·ground

of falsely answering

trip

. signal. This may

eliminating the.g~ound

false

an

trip

over-

signal· by shorting out the ground signal points

at

the ground signal terminal board on the

frame

be

identified by the 0.15UF capacitor connected

of the

breaker.

Terminals 1 and 5

(Fig~

If

breaker

is

false

TRIPPING

GROUND

the

breaker.

detector

restored

to

service

and with the

deactivated, establish whether

tripping due to overcurrent. ·

CAUS.ED

FAULT

is

equipped for. four wire

BY

DETECTION

service

itisimportant

be

effective by having continuityfrom

at

the Power Sensor Unit to the

C.

T.

and

further

the signal conductors .

exists

these

1.

Remove connection plug at Power Sensor

are

2. Check to Rand

Temporarily connect jumper

3.

through the ground signal circuit.

conditions

located

. .

be

C. ·

that this shield be isolated

It

is

also important that

as

follows;

on

end of plug.

sure

no

referring

conµnuity

from

to

exists

. shield

Fig.

-

be

40).

that

be-

Low Voltage

Power

Circuit

Breakers

GEK-7303

Fig.

.1 •.

either

to

a

ss

ure

Plug

..

terminal· at

the

shield

to

remote

between R and A.

exist, discontinuity

disconnect Remove. tinuity

Note the

sure

current load

cordance with

connect to the

· have

After

mine

Sensor

.

advisable

the

In

This test

ple of

comparison In the event

sensor, single pole at

shield

jumper

is

establi~~ed. · ·

po_larity

the

external

associated

current

its

polarity

TESTI

the the

Unit and the .

use

of a

this

event·

should

pick

the

terminal

is

must

as

the

and

Fig.

source,

N~ _

PST-1

adequacy

or

required

Hi-current-

on1y

-up·

setting

with published

the

ground

testing

33

(8039646) Magnetic Coil Assembly

· (Mounted on Assembly

Power

2.

Transformer

Sensor Coil Assembly

Taps in Ampere

3 •. Disconnect Plug

· remote C. T. and check to

is

continuous from Power

C.T.

by checking

If

continuity does not

for

Sensor

continuity

now

not continuous and the point of

be

found~

possible

at

remote

marks

ground C.

with the

that

polarity

40.

If

the external C.T.

on the grounc!_sensors.

the breakerbottom

Check the control

point of discontinuity.

C.T.

after

T.

senses

particular

marks

_shield

the are

c;:on:.

neutral

breaker

in ac-

studs

must

also

~,;irk toward the source.

MAGNET

Test

of

perf~rmance o!

Power

to

one-

test

be

made at·

such

breaker

sensor

unless

board

Kit

test Low voltage type

IC

COILS

has

been used to

SUpply

Unit,

t1?e

it

deter-

Power

may

the magnetic coils by

test

per

phase need be made.

some

convenient multi-

as

3 X

current

time-current

is

equipped with ground

setting

curves.

will cause tripping on

the signal

Fig.

(40)

is

short.ed

. Short point

set.

~e

be

for

AK-3 75, 100

Fixture)

4.

Terminal

5.

External

Ground Sensor

Board

Breakers

(Only)

·

Lead

1 and 5 during

. .

overcurrent

test.

The above considerations should indicate which of ·

the· four

major

components

is

faulty and

in

need

of replacement.

REPLACEMENT

COMPONENTS

Power

Sensor

Unit "(Fig~

1. _ Loosen

front

frame.

·

screw

OF

POWER

35)

· connecting the

-SENSO R

.

uni~

tq th_e

2. Slide unit forward. 3 • . Remove control plug by alternately loosen-:

- ing th~ two retaining

4.

Replace

Trip

Solenoid

(Fig.

in

reverse

screws.

order.

36)

1. Remove. opening springs

2.

Raise

cross

bar

to gain additional access

room

3,

Remove two nuts holding device to

bracket

4. Remove wiring cleats and connections to

terminal

solenoid

board

for

removal

on Power

Supply

to

free

the·

trip

5.

~eplace

i°:

reverse

order.

Low Voltage

Power

Circuit

Breakers

GEK-7303

. 6. Check positive

,-,vertravel

trip

to

!Power Supply (F~g. 34) .

1. Remove

inal

board

I

2.

et

to

mech~sm

3,

4. Remove

loosening two

5. Remove ·

wiring.

6.

SENSOR

1.

Unit and screw

frame

after

the

breaker.

trip

on

Power

Remove

Remove w~ring

Reassemble

Coils

Disconnect

holding

•

three

retaining

(AK-3-50) Only_ (Fig. 32)

the

sensor

female

trip

to

obtain approx.

armature

is

moved sufficiently

solenoid wires from the term-

Supply. · ·

boltsholdingmountingbrack-

frame.

cleats

disconnect

Power

in

reverse

J_>lug

plug by

screws.

Supply Unit with control

order.

between the

coils

plug

and rempve tapped

to

breaker

alternately

Power

mechanism

1/32"

Supply

Separate

. 2. described FRAMES.

under

front

SEPARATION OF FRONT & REAR

frame

from

back

frame

:.

as

Fig.

37 (0133C9018}

Power

Diagram ·

Sensor

Cabling

Fit;.

38.

1.

2.

3. White

(7612-6-2)

(Remotely Located)

Terminal External

Grow1d

Ground

Polarity

Sensor Coil

Sensor

Dot

Con

Fig.

39 (8039962) Power

Sensor

Kit

GEK-7303 Low Voltage

Power

Circuit

Breakers

6

Fig.

34 (8039648)

1.

2.

3.

4.

5.

6.

Indicator Terminal Capacitor Female Male Mounting

Disconnect

Power

Block

Plug

Brackets

Supply

Plug

2

Fig.

35 (8039649)

1.

2~

3.

Mounting Captive Name

Plate

Power

Screw

Thumb

--.

Sensor

Screw

__

.,

3

Unit

1. Name

2.

Spring

3. Mounting

Plate

Fig.

36 (8039903) Magnet

4.

5.

Bracket

6.

Adjusting

Trip

Arm

Armature

Trip

Screw

Device

7.

8. Coil

9. Magnet

Clamp

GEK-7303

Low

Voltage P

owe

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TRIP

•

II

a

•

17

•

n

11

3.

On drawout

gr

·ound

sensor

leads

at

plug. On

shielded

4~

Remove the

terminal

stationary breakers

pair

breakers

coil, unsolder

board

from

four

on

Terminal

bolts

wired

external

for

female

the fourth

sensor

disconnect

unsolder

Board

(Fi

connecting each

· coil as·sembly to the pole unit.

5. Remove the coil

assemblies

taking

not to damage the inter-connecting coil

· 6.

No blies from

Sensor

should

around

7.

· Replace coil Coils (Al_{-3-75/100) Only (Fig. 33)

further

their

breakdown of the .coil

be

made. Do not remove the coils

iron

core

.

assemb

lies

in

reverse orde

1. Disconnect control plug between Power

Supply Unit and

2.

If

present,

coil lead

as

described

Sensor

Coils .

disconnect fourth ground sensor

in

Step 3 above.

coil

twisted g.

40).

care

wires.

assem

r.

Low Voltage

5. Work with one outside pole, onfo

your

right

inder,

until

board from

now move

coils

are

on

clean

your

arm

interconnecting coil

spacers.

of

purpose

-

is

SELECTIVE

Selective tripping

in

the

electrical on the current the

to

basis

shorter

trip

pickup.

before the setting and the higher the fault

breaker

the a fault only the

is

occurs

breaker

Power

coils

removed place

flat surface.

Spaces may

to

of a time

on the ·

Circuit

Breakers

toward end of

slip

coils

arm

or

properly

to

center

pole

coils

When removing coils

be careful not to

wires.

Also note location

vary

in thickness

space coils out .

TRIPPING

is

a1str1out1on

This

obtained when the

system

progressive

series

will allow the

setting and the 1ow

breaker

having the lon

current

part

of the line

GEK-7303

stud.

off

Starting

stud

and

supported cyl-

~d

O?t side .Pole

with

resistor

break

or

f?ul

their

for a firm

fit.

.

breakers

are

arranged

of

time

avd

breaker

pickup, provided

protected

er

ger

having

pickup

time

by

having the lower setting. Hence, if

in any

part

of

nearest

the

electrical

the fault will

system,

trip.

·

3. Di

sconnect ·resistor by removing two nuts frame. bolts and

·

4.

Remove the two remaining hex head

nuts.

Remove

Lift

collar

from

board

at

board

from

studs welded

from

the two

end of

primary

back

to

frame

back

studs.

disconnects by loos ening two allen head bolts and sliding off

collar.

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Magnet Overcurrent

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Devices

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E

TIN

C

U~!I N

42B (109HL689) Ground

M L

solid-state

I '

U

TIPL S OF

fault

• •

I.a

E

1 I I I l l

•

. I .r I I 1

GROUND

sho

trip

I

.

TIii'

rt-tim device.

• •

SETTING

e- delay

I

r I I

•

ttl

1

.I

I 1

I

•

11

time-current

.

I

-

curves

•

• •

for

'

....

5.

Push

di$connect

.

6~

Strip

1/4

in.

from

7.

and

tip

hold

be that ends

the

Place

crimp.

8.

Pull

fits

snugly

9.

Crimp

wire

10.

Any hollow

pushed

position by.

of

tubes

11.

When

body

breaker

Drawout

mechanism

withdrawing

It

provides a suitable through operations

of

the

disconnects complete the

breaker, strokes refer

required

to

wire

assembly.

in&ulation off end of

the

new contact tip on end of

wire

against

tab

in

place.

into

and

all

of

the

movable disconnect

cross-channel.

· DRAWOUT

breakers

which

of

the

part

when

details

such

instruction

breaker.

through hollow tube of new

wire

end.

through hollow tube

until

· end of hollow tube.

on

other

tubes

the

disconnect body and held

placing

spreading

wires

have

which

fiber

tabs.

been

side

of

assembly

are

not

used

spacers over

connected,

assembly

MECHANISM

.

(FIG •. 43)

are

furnished with a drawout

facilitates

the

breaker

of

the

stationary

menas

inserting

the

inserting

from

its

enc

of

forcing

the

and withdrawal ·

and movable halves

. engage and _ disengage.

of

inserting

as

the nuinber of racking handle

to

install

or

ezEK-'Z302 furnished with the

and withdrawing

withdraw

the

·

to about

wire

contact

to

should

in

inner

refasten

to the

and

losure.

breaker

For

breaker,

Low Voltage

Fig

. 43 (8026230) Typical drawout me

. 3.

4..

Power

1.

Racking Handle

2.

Link Pin Racking Cam

.

Circuit

Breakers

GEK-7303

chanism

The

. ctr·awout

drawout

· t operation is

closed.

causes the In

the

semi-circular

this

position racked-in The · first

causes

the

rotating move

the

trip

the

upward

interlock

. holds

tion. handle

breaker fully

quired.

it

trip-free

The releases

to

racked-in

ADJUSTMEN'J'.S

One

adjustment

With set .position the ·

racking

be

at

least

..

of

the

trip

screw

on

mechanism

rip

interlock

from

Ins

being

erting

racking ·pins. on

slot

the

by

operating

upward

racking

interlock

link

breaker

stroke

link

(2) and causing the pin (3) to

against

trip

paddle.

during

fifth

and . final

the· trip

be

closed, . since

. .

(Fig.

43)

on

the

breaker

and

the

racking

~ins

on

1/8in.

clearance

interlock

the

interlock

is

·equipped with a

which performed the

prevents

wlien the

breaker

in

the

into

the

housing

racking c~m (4).

is

ready

racking handle (1).

a racking

breaker

the

housing.

to

engage

to

be

fully

of the racking· handle

on

the housing to engage

and pin

assembly

(2, 3),

the adjusting ~crew on the

This

trips

the

interlock

the

trip

mechanism

the

housing,

entire stroke

the

interlock

cam

breaker

racking_

of

the

and allows

breaker

in

(4)

not engaging

there

-and

opera

racking

the

is

now\

is

re:.

the

re-

should

between the top edge

(3) and the adjusting

trip

.

..

_

The

75, 100 racking

breaker

Drawout Mechanism

Breakers

pins

are

mechanism

Fig.

44 (8039672) AK-3A-50

1.

Racking

is

located in the equipment.

(1)

Fig.

44, two on

furnished

tray

in

to facilitate the drawout

the equipment.

Pins

for

AK-2A/3A -50,

either

side

Four

of

the

GEK-7303

For

each should for

the

The

circuit

base. pairs fingers bolts

stud exert a set stud

through the action of the compression

Retainers

correct

The amount against

-which the springs nut

~hich

REPLACEMENT

If

replaced. or the bolts should be carefully noted and the number of

turns

in

reassembly

can

be

fo.

rmer

Low

Voltage Power Circuit

the exact

breaker

l>e

made to the coordination

particular

BREAKER

PRIMARY

primary

breaker

Each disconnect assembly consists of four

-of opposed contact are

which

of the enclosure; the disconnect

amount of force against the stationary

and

. alignment

the stud

_hold the assembly

for

any

_removed, the position of the nuts on

of the nuts shoula be counted,

restor~d

position on the bolts.

characteristics

in a selective system,

system.

ACCESSORIES

DISCONNEOS

- AK-50 ·

discoruiects

studs

secured to the pass

thrpugh the assembly and the

spacers

of

force which the fingers is

are

reason

the original amount of compression -

by replacing the nuts to

ONLY

are

at

the

rear

fingers.

breaker

hold the contact

for

engagemenf with the stud.

determined _by the degree to

compressed by the bolt and

toge~~r.

. the disconnects must

Breakers

and setting of

reference

chart

furnished

attached to the

of the

breaker

The contact stud by two

fingers

springs.

fingers

exert

·

be

so

their

that

The

kept

· The serve cuit

are

--

mounted on a horizontal rear the

general These breaker external

The

consists

_ conducting

in

ible into sliding onto the

enclosure.

REPLACEMENT

1.

cross-channel.

2. Open

3.

4.

primary

lubricated

SECONDARY

secondary

as

connections between elements are

used

of the

same· purpose

purpose

secondary

without the connections.

movable

of

spring-loaded

lead

is

its

enclosure,

Unfasten disconnect body

Pull

· Remove contact base.

disconnects should always

with G.

and .

external

only on

breaker.

enclosure

disconnects allow

part

an

insulating body which holds a

attached.

stationary

tabs

which hold

contact tip

E.

DISCONNECTS

disconnects· for

control

drawout

cross-channel

A

stationary

.mounted

of

the

plunger As

plunger

loose

tip

terminal

secondary

by

on

necessity

the

Co. D50H47

breaker

circuits.

breakers

board

breakers.

removal

of having

to which a

the

breaker

is

-depressed. by

disconnects of the

from

wires

on

from

cutting

grease.

all

breakers

control

They

and .

at

the

mounted and

serves

of

to

detach

disconnects

flex-

moves

breaker

inner

hollow tube.

wire

side.

at

be

cir-

are

top

the

its

GEK-7303

Low

Voltage Power

2 3

4

5.

6

Circuit

--

---{;}

. .

I

.

I

Breakers

•

II

•,

II

~

)

-$

a

10

9 8

1

I. SPRING

2.

3.

FRAME

4. WEIGHT

5. SCREWS .

6. MAGNET

7.

COIL

8. CLAMP

9. ARMATURE

10.

ARMATURE

.

II.

TRIP

12

..

PADDLE

CLAMP

ARM

Fig.

45

(0133C90?

SHUNT-TRIPPING

(FIG.

The shunt tripping device

bracket

m.echanism

to close the ar_ma_ture tr1ppmg the return the

attached to the left side

(looking

A

remote

switch

circuit

(9) to engage the trip paddle (11), thereby

breaker.

the

breaker

To

armature

trips.

prevent

overheating, the coil

from the front). ·

or

of the device causing the

to the neutral position

The spring

DEVICE

45) is

mounted on a

of

the operating

relay contacts

(2)

are

is

used to

(7)

used

after

is

cut off by contacts of the auxiliary switch which are

open when the

ADJUSTMENTS

From

armature

If

any adJustment

amount of

or

out accordingly.

REPLACEMENT

1/32 in; to

~s

overtravel,

1. Di.sconnect

2. Remove magnet

(3).

breaker

required

is

OF

COIL

leads

is

1/16-in.

when the

necessary

the

(Fig. 45)

to coil (7).

(6)

open.

over-travel of the

breaker

is

tripped.

to provide

trip

lever

is

bent

and coil from

this

in

frame

Shunt tripping device

1)

3.

Bend

and

remove.

4.

verse

order.

The device

breaker

the

Remove coil anq

lower

BELL

LOCKOUT DEVICE

end of clamp

ALARM

(FIG.

operating

crossbar operating the device whenever tripped voltage device The shunt

by the

trip

overcurrent

or

the drawout

device and the manual

will defeat the device. The

can

be

reset

device on the is trip

front

omitted, the device can. be

button

the fault

Adjustments

escutcheon. If the lockout device

or

has

been

1. Adjust the

that a clearance

only by the manual

by· closing the

eliminated.

bell

of

1/16

tained with the catch

closed.

2. With the device adjusting arm

(13),

for an in. This will

after

assure

breaker

screw

an

overtravel of

the device contacts

that the device

(8)

straight

install

AND

new

coil

in

46) link (2) is· engaged with

side-link

trip

bell

alarm-device

in.

(15)

fully open,

(12), on the

pin (1),

the

devices,

trip

alarm

reset

breaker,

:t;

1/64 in.

when the

1/16

are

just

is

operated

thereby

breaker

the

under-

interlock.

trip

button

and lockout

trip

button

by manual

provided

latch

is

(4) main-

breaker

adjust

operating

to

3/32

touching

when the

re-

is

so

is

the

of

.:

1.

Crossbar

2.

Operating

3.

Lockout

4.

Device Lat

5.

Lockou

6. Trip Shaft

7.

Latch

8. Shunt

9. Shunt

10. Shunt Trip Device

11. Bell

12. Dev

13.

14.

15.

16.

ice

Operating

Manual T Catch Trip

Side-link

Link

.

A~jus

Ung

ch

t Tr

ip

Paddle

Rel

ease

Strap

Trip

Armature

Trip Armature

Alarm

Rod

Plunger

Adjusting

Arm

rip

Rod

Release

.

Screw

Lever

Screw

Collar

3--

4- - -

5-

.

6---t---\1~

7-

--

8-

----

9 - -

10--

Low Voltage

-

------

----

---,-

-

\

----~

-H;.~--."I

--~~\::::~q_-1;1

---

- -

~ ~ ~

Power

T)

Circuit Breakers

,-------

,---

GEK- 7303

16

---

15

breaker

voltage Jock

3. adjusted (5)

and

is

opened. This

open

The lockout with

4.

position rod disengaged

5.

strap l

ever This def operates. a

part hook in a manner catch

is tripped-by

condition, and

.

The

so

displaces

until

the

the l9ckout

With

the trip-rod rel

(14)

so

before

This

(7)

which

(8)

when

eats

of

the

around

are

disengaged bef

Fig.

46

. '

locko

ut

adjusting

that

it

engages

the

assures th

device

adjusting

feature

the

manual

that

the the }>rie

device

the

The latch

device

the

that will

is

engaged

the ·shunt

device

shunt trip arm

(845C278)

an

overcurrent

by

the

drawout

screw

the

trip

shaft

at

the

is

reset

as

screw

. -

trip

button fully

ease

collar

latch

(4) and

aker

opens.

t qui~ped with

py

the

trip

when

the

rel_ease

(4),

assure

ore

Bell

alarm

trip

(3) should be

lockout t!'iP paddle.

(6)

when

the

breaker

described

is

furnished

depressed

(16) on ,

ca

tch

shunt device

strap

the

latch

trip

is

shunt trip

(7), which

must

be ature lever device l

the

breaker

and lockout device AK-50, AK-75"

or

under

inter-

breaker

is

locked above.

only

the

trip

(15)

are

release

armature

operated.

device

formed

(8)

atch

and

opens.

-

is to

II

. 12

and

AK- 100

fuses. bre~ers, protectors furnished

devices

breaker

device.· of

any

OPERATION .

·

~

When any orie of

co

il and moving trip the ing the motion also

in

has breaker by

coil is

tripped

ADJUSTMENTS

This

breaker

are mounted

(looking

is

to

trip

one

of

the

(6),

in that

the armature

to

the

paddle

armatu

the

arm

armature

the

blown.

operation

(6)

(1) and

re cl

(9)

moves

extended

The

in

the trip

of

is

de-energized ·as

open.

devi

ce

is

furnished

fuse

combinations

after

on

from

front).

the. breaker

breakers

the

particular

(8)

closed

osed, spring(13)discharges

in

(9) in -

air

a

clockwise

the

position

latch

free

the

manual

- ·

August,. 1960. The

the

left

hand

The

upon

fuses

.

breakers

phase,

closes. trips

the

reset

closed

position

The _armature

gap

position

the

breake

direction

closed

.button

indicating which fu

armature

until

reset

soon

on

all

and LB-1

side

of

purpose

fuses

position. T

it

button(lO).

as

the

blowing

blow·

is

energized

engages

r. W

, pivot-

and

latches

(10)

forward

holds

is

released

the

breaker

of

AKU

the

this

the

(8)

the

ith

his

se

the

The

OPEN

The

3

separately

each

wired

FUSE

open

fuse lockout

in par

LOCKOUT

{Fig

operated

allel

. 47)

device

devices

to cor

consists

(one

respo

DE.

VICE

per

nding br

of 2

phase)

eake

or

the tri1wed.. If

proper

r

From

armature

nut

A 1/8" Min. dimension should be

(4)

and

overtrave

1/32

inch

is req

adjustment

tt:1rn

l.

to

1/16 inch

uired

when

is, 1recessary, l

rod

(3}

in

or

Retigllten lock nut (4).

. .

overtr avel

the breaker

oosen

out-to .obtain

lock-

maintained

of is

the

GEK-7303

Low

Voltage Power

Circuit

Breakers

for

the

reset

loosen lock nut ahead

button

until :proper

button (10). To adjust

of

reset

adjustment

is

reset

button &

made. Re-

tighten lock nut.

REPLACEMENT

If

it

becomes

proceed

as

necessary

follows: ·

to

replace

coil

1.· Remove five bolts connecting the device to the lockout device, guiding rod

15

side

plate and front

14

frame.

(3)

thru rod

button,

turn

(6)

Lower .

guide (2). Continue until

movement

wiring

2.

Disconnect

3.

Remove two

to

4.

- Bend

harness.

leads

the device mounting

lower

5. Remove coil. parts

in

reverse

. 3 ROD

lowering

is

to

screws

restricted

coil

holding the

by

(6).

plate.

e.nd

~f

brass ·clamp

Install

new

coil

and

order.

I

TRIP.PADDLE

2

ROD

GUIDE

4 LOCK

. 5 1'.RIP DEVICE

t

7

8 ARMATURE

9 ARM

10

I I ROD. RESET

12

13

14· MOUNTING BRACKET

15

NUT

COIL LINK

ASSEMBLY

..

RESET BUTTON

SPRINGS. RESET SPRING. LINK ASSEMBLY

TRIP

SHAFT

·

.

eu,:TON

ROD

the device

the

device

trip

device

straight.

replace

·

5------t

6--------'

.

7----------'

8---------.J

F!g.

47

(0133C9024) Open

~--------~13

~--~------12

~--------11

Fuse

Lockout Device

~---10

Low Voltage

1/16

in.

for

5/64

in.

for

3/32

in.

for

1/8

in.

for

5/16

in.

for

3/8

in.

for

8

oz.

ball

peen

1/4

in.

Spintite• wrench, long shank

3/8

in.

Spintite• wrench

Power

Allen Wrenches

No. 6 No. 8 No.

1/

1/2 1/2

screw

10

screw

4 in.

screw

3/8

in.

drive

in.

screw·

Miscellaneous

hammer

C~~cuit

screw

ratchet

Breakers

with

adapter

GEK-7303

shank

Fig.

The

following tools maintenance of the tenance

Phillips Phillips

-

Phillips Long thin, slotted

Standard, Short

Offset

Gas

Long

Waldes Waldes

manual applies.

No. 1 No. 2, 8 in. shank No. 3

slotted

shank, slotted

ratchet

Yankee -

ratchet

Yankee

pliers,

nose,

8 in. -

side Truarc Truarc

48 (8039339) AKU-3-50

are

recommended

breakers

· Screwdrivers

screw

screwdriver,

Pliers

cutting, 6 in.

No. 2,

straight

90

to

which

slotter

Phillips

degree angle

for

proper

this

main-

(No. 3400) (No. 3412)

NOTE: Obtain tools do

not

Co.

order

from. the

from

RENEWAL PARTS

When nearest specifying the quantity

parts

the

r.enewal

In the absence of a

for

part nameplate

Renewal Jdentical with the improvements ever, changeable.. · ·

Renewal

of GEF-4150 -AK-2-50

GEF-4151 AK-2-75/100

ordering

General

by the Catalog Number

parts

which no

should be fully

parts

breakers Bulletin

bulletins.

parts

data of the

parts

which

are

which

bulletins

are:

renewal

Electric

parts

bulletin

described

breaker

are

original

made

from

are

furnished will be

parts,

Company

required

bulletin

are

and the complete

furnished may not be

parts time to·time • . How-

for

the

·

Breaker

local

hardware

General

and describing as

avatlable, the ·

should be given.

various

TyPe

Electric

address

Sales shown in_ the

or

breakers

~ince design

the

Office

inter-

types

Socket Wrench (1/2 in.

Ratchet handle Extension, 10 in. Extension, 6 in. · 13/16 in. 7/16

in.

_

9/16

8 in.

1/4

1/2

.

5/8 3/8

11/32

.

5/8

*Trade-mark

socket

in.

socket

adjustable in. in.

in.

in.,

-5/16

-9/16

-3/4

-7/16

in.

in. open end in. open

in. open end

-5/16

6 point open, box

of Stevens-Walden, Inc.

End Wrenches

end

in. open end

drive)

5/8

in.

3/4

in.

15/16 in.

socket socket

socket