GE AKR-3-50, AKR-3A-50, AKRU-3-50, AKRU-3A-50 Maintenance Manual

MAI NTE NANCE

MAN

UAL

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POTVEN

TYPES

CIRCUIT

BNEAIIERS

AKR.3/3A-50

AND AKRU-3/3A-50

GEilERAr

@

ErECTRlC

GENERAL

General

Breaker

Mounting

Fused Breakers.

Breaker
Breaker

DESCRIPTION. .

Types

Ratings

Description . .

CONTENTS

.

.

.

Page

3

3

3

4
4
4
4

RECEIVING, HANDLING, AND

Receiving

Storage

HandlinC . . .

and

BREAKER OPERATION

Putting the

Breaker in Service

Drawout Breakers

Breaker

Insertion

(Fig.

Breaker Withdrawal

Stationary Breakers

Pre-service

Operating

Manual Closing

Electrical

Openlng

the Breaker

the

Check

Breaker

Closing

Interlocks

Closing
Racking Mechanism
Optional

Accessories .

Shunt Trip

Undervoltage
Static

Electric

Spring Interlock

Interlocks

. .

Device

Time-delay

Lockout

Undervoltage

Device

Interlocks

Auxiliary Switch

BeII Alarm

BREAKER MAINTENANCE.

Safety

Precautions

General

Arranging the Breaker for

Slow Closing

Lubrication

Replacement

Mechanism
Mechanism

and Adjustment of Components

(Figs.

12, 13,

Replaeement
Latch Adjustment
Manual Handle

Adjustment

Contact Maintenance

Contact Replacement

(Fig.

Contact Adjustment

Components and Accessories

Auxiliary Switch

Trip

Shunt

Maintenance of

Electrical

Control

Bell Alarm/Lockout

Drawout

Mechanism

(Fig.

18)

and Undervoltage

Static Delay Device for Undervoltage

C omponents

FiS.

and

AKRU-50 Fused Breaker

Fuse Replacement

Fuse Lockout

Open

Power Sensor Overcument

Tripping

False
Testing

Replacement

Current

Magnetic Trip Device
Selective

Time-current

Tripping

Curves

Device

Caused

Sensors

Trip Device

by Faulty

(Figs.

STORAGE

3)

(Figs.

6A

(F'ig.

. . .

14)

and

(Figs.

Interlocks

17)

.

Device

26).

(Fig.

33

15

32)

Ground

and 38)

68).

and

8)

and

(Figs.

.

.

16)

.

.

and

. .

19

Fault Operation .

. .

Accessories

20).

and

. .

(Figs.

.

.

21

.

and

22)

. .

. . .

5

5
5

5

t

5
5

n

I

7

8

8
8

10
10
10

10
11
11
12

t2

13
13
13

l4

t4

15
15
15
15
16
16

.

.

16

18
19
19
19
19

20

2l

2t

22

24
25
27
28

29
29

31
31

34
34
34
36
36

3?138

IOW-VOLTAGE

TypEs

AKR-3/3A-so

POWER

AND

CIRCUIT

AKRU_3

/ga-so

BREAKERS

Low-voltagepower

controlling

voltage

this

function,

loads

normal

the

more

overloads

The

breakers

protection
mizing
sons

who apply,

will

acquire

information

andprotecting

range

and

automatically

conditions

common

and

proper

is

a

personnel,

of

equipment

the knowledge

contained

(usually

they

undervoltages.

use,

prime

damage

use,

BREAKER

Ali

make, quick-break"

of the

of

storing

lease

in

ferred

for

to an

fast

subject

energy

closing.

opening

tripping.

in

In

GENERAT

circuit

power

up

to

are

a means

clearing

occur.

are

care,

Among

short

and

safety

as

wellas

when

and

service

they need

in

these

TYPES

breakers

descripiion,

a closing

closing,

spring

some

to be used

GENERAT

breakers

circuits

600

of safely

circuits

maintenance

consideration

faults

instructions.

are

having

spring

volts).

circuits

these

and

a means

occur.

these

by

of

the

for

energy

sJbsequenilv

are used

conditions,

gaining

the

for

inthe

low-

In servins

switchin[

when

ab-

sustained

of

these

for

the

mini_

of

per-

breakers

the

"quick_

feature

quick

re_

is trans-

DESCRIPTION

Fig.

(8041849)

1.

AKR-50

Manual

breaker

hdividual

morrnted,

and

in

other

Type

of

Overcurrent

Trip

Device

These

inslruclions

wilh

instollotion'

for

lhe purchoser's

breakers

how

they

categories

do

operdlion

purposes,

may

operate,

as

IABTT I

Drawout
Stationary

Manual,

Quick-close

pvrport

nol

or moinlenonce.

rhe

moner

shown

lo

covsr

shourd

vary

in

how

they

in

Fig.

I

Electrical,

oll

dcloils

should

6e referrd

how

are applied

Table

or

voriolions

furlher

they

L.

Fig.

in

informolion

ri

rhe

c.^irilii".tr;"-t;;;;r:"

are

egurpmenl

bi iesired

Fig. 2

nor lo p.rovide

o,

tno[ii'pirtirutor

(804t9i9)

for

everyposible

pioblams

AKRU-S1

breaker

conlinge

arise

which

Electrically

ncy lo

be mel

nol

in connection

covered

ore

operated

sufficienlly

GEK-731O, Power

Circuit Breokers

IY\OUNTING

Most breakers

type.

These

which make them
from their

features

inserting

mary

part

and

included.

type are interchangeable in their various

in the equipment. This helps breaker maintenance

associated

are

andwithdrawing thebreaker

and controL

automatically. Interlocking

Drawout

in that spare breakers can

breakers

The

mounted

fasteners being

and make

nections

supplied.

FUSED

Fused

in their

breakers are not interchangeable

are

"stationaryf'breakers

on a framework or

powef

are

BREAKERS

breakers

model identification

produced

breakers are

easy to

switchgear equipment.

a racking mechanism

power

breakers

being inspected or serviced.

used

to secure the breaker frame

connections.

needed.

a

are

are

equipped

install

disconnects

the same rating and

of

be

"plugged

are

panel,

control

If

suitable

given

terminal

the

of the

with

in or withdraw

(whichfacilitates

unit) aad

which

designed to be

with

extra letter

number.

with

standard

"dralvout"

features

These

pri-

connect

devices

mechanical

power

Type

are

locations

in"

while

con-

board is

"LI"

AKRU

gen-

eral-purpose drawout breakdrs since their enclos-

ures must be modified

required for

the fuses.

All fused breakers are

fuse lockout

tically trips

fuses open. It

position

atdd.

is

fuse

possibility

phase

energized.

device

the breaker

alsolatches thebreaker

until

a resetting

should not

This

replaced.

of allowing the

This

BREAKER

Type AIG-50

breakers. This represents

size

tinuouscurrent

breakers

theymay

is modified by the rating

device

lovest

device is 200

plied

with which the breaker is

available

As to voltage ratings, the breakers

to 600

up

rating of the

amperes.

volts,

provide

to

equipped with an opened

(OFLO

device).

open

the extra space

automa-

This

when any of the three

inthe

device is manual.ly

be done until the expended

arrangement

circuit to

eliminates

have

only

RATINGS

1600-ampere

are

the maximum

carry.

ac.

This

of the

Power

current value

overcurrent trip

equipped.

Sensor trip

may be

opened

oper-

the

one

frame

con-

The

ap-

Short

circuit ratings

on which they
equipped

current trip

are

with direct-acting

devices. See Table 2.

BREAKER

IGnowledge

how it

proper

il its

operation.

and

maintenance

operates will

use

of how

of the breaker and

The three main

breaker are

ing

the conductive

The

ergy,

store

deliver
be able

breaker
matic

trip device

it

also

quickly

a

manner as

arc

runner.

The

assembled

are

the mechanical
sulating

bers

are the studs for external connections, mova-

and

ble

able contacts, and

rent

transformers.

The

the

arcingcontacts,
back base and
blies.

In addition to these basic

may

be equipped

cessories and

its mechanism,

mechanism

it,

and

it

to close the breaker's

to reverse its commitment

at any

must

enough

current-carrying

stationary

interrupter

point

be able

to

to effect

on the back

support required and

structure

the removable arc

interlocking devices.

vary

applied

IABI.T

Three-phase

42,000 amps
50,000 amps
65,000

amps

the

with

and whether they

2

system vottage

instantaneous

Short-circuit

42,000 amps
50,000
50,000 amps

DESCRIPTION

breaker

the

enable

is designed and

purchaser

the

to avoid mistakes

Specific

procedures

later

directions

will be

functional

an

assembly

members, and

unit is

designed

(when

called upon to

on

treated later.

components of a

the ilterrupter.

to receive en-

contacts.

(i.

e., be

upon

activation

the

"Trip-Free").

to trip open a closed breaker

minimize

needed.

contact

provision

components are, in

the

with

arc

proper

erosion and in such

arc

transfer

members

of the breaker

frame, which

conductive

The

pivots

sets,

for mounting the cur-

arc

runners

components,

any combination

mounted

quencher

are

over-

Rating

amps

to make

adjustments

compris-

do so)

must

It

to close

of

an

auto-

Finally,

the

to the

provides

also

the in-

mem-

for t}te mov-

addition to

on the

assem-

a

breaker

of many

ac-

Power

Circuit

Breokers,

GEK-7310

RECEIVING,

RECEIVING

breaker is carefully

Each

before shipment. Immediately

circuit

anydamage

handling
immediately with the

nearest

notified.

during unpacking
that no damage

handling, or from exposure to

Check

that no

service
this is not

betakento insuretheproper storage of

breaker,

sustainedin

is evident,

General

is expected that due

It

parts

all

parts

have been overlooked.

is recommended that the

It

immediately in its

possible,

AND

an

examination

a

damage

transportation company

Electric

installation of the breaker so

and

occur

wi.ll

HANDLING

inspected

upon receipt of the

should be made for

transit. If

claim should

Sales

care
from

damage

Office

will

careless or rough

moisture

against the

packing

list to be sure

STORAGE

breaker

permanent

following

the

precautions

HANDLING, AND

1. The breaker should be

packed

and

rough

or

be filed

and the

should be

be exercised

dirt.

or

put

be

into

location.

must

the breaker:

against
warm dry room, since water
verse

ers for outdoor switchgear should

equi.pment only when

heaters are in

2.

cation

ticular care shouldbe

from moistwe

has

If

STORAGE

condensation,

effect on the insulation

operation

breaker

The

free

from

and

a very

CAUTION:

FOR

BE

THAT RUSTING HAS

TO ASSURE

corrosive effect

IF THE BREAKER

ANY

LENGTH

INSPECTED

DITION. SHOULD

preferably

by

absorption

parts.

be

power

should

corrosive

taken to

cement dust, as

PERIODICALLY TO SEE

GOOD

is available

prevent

to

be stored in a clean lo-

gases

or fumes. Par-

protect

this combination

many

on

IS STORED

OF TIME,IT SHOULD

NOT STARTED AND

MECHANICAL

THE BREAKER BE

STORED UNDER UNFAVORABLE AT-

carefully

MOSPHERIC

BE

CLEANED AND DRIED

BEING

CONDITIONS,

PLACED IN SERVICE.

IT

OUT BEFORE

protected

storing

has an ad-

Circuit

stored in the

and

condensation.

the equipment

parts.

CON-

SHOULD

it in

break-

the

a

BREAKER

PUTTING THE

DRAWOUI BREAKERS

mechanism used

The

force required to overcome the resisting force of

disconnects

the

onthebreaker rather than in the drawout

mechanism

This

mechanism

unit

subassembly and

assembled breaker

work on the breaker.

or

BREAKER

to

on Type AKR

IN

SERVICE

provide

breakers is mounted

mechanical

the

enclosure.

is referred to as the

the

"racking"

can be

without doing any disassembly

mechanism. It is a

added to

a completely

"drawout"

This drawout mechanism consists of a crank-

power

a

and

shaft

fastened to each end of the crankshaJt is

having

arm

in the equipment enclosure.

tates, the crank arms, acting on the stationary

cause

the breaker to move

enclosure.

screw

an open slot

crankshaft

The

which operates

which

with respect to the

engages a fixed

the crankshaJt ro-

As

it.

is driven as the

Rigidly

a

crank

pin

pin,

breaker

power

OPERATION

screw

supported by a centrally located

shaft. The

by means

crank.

will engage the square end of the

breaker. A

be moved aside

screwshaft

clockwise direction moves the breaker into

nected
breaker to move

BREAKER

drawout enclosure

even coating

bars inthe

connects

is turned in an internally

power

screw,

of an external

has,

This

sliding cover in the escutcheon must

end.

position.

|NSERI|ON

procedure

The

1. Before inserting

of D50H47

enclosure

the

of

its

on

so that the handle may engage the

Turning the crank handle in a

reverse

The

out.

(FtG.

for inserting

as

is

the breaker, apply

whichengagethe

breaker.

crank on

jackscrew,

or

handle

a square socket

end,

power

of

3)

a

follows:

grease

to the silver-plated

threaded trunnion

the crank-

is turned

in the form of

which

screw in the

the con-

this

causes the

breaker into its

light,

a

primary

dis-

a

GEK-731O,

Power

Circuif

Breokers

5.

Extend the second rail.

6. Align the

in the rails and

ing

go

move

pins

the

all the

the lifting device.

7. Make

the trip button.

move

the sLiding

racking

clockwise

and remove

remove
the ends of the rackingshaftso that theywill engage

the

has not been

the encloswe, the

to

handle.

8.

itispossibletoturn

If

it. This step is taken to

pins

in

engage

the

pins

on the breaker

carefully

lower

to enter their slots. Make sure the

way down to the bottom of the slots; re-

sure the

breaker

While

is open by

holding in the

with the slots

the breaker, allow-

trip

pins

pushing

button,

cover aside and then engage the

handle

direction, do so

handle.

the

housing.

the

operated while the

pins

andthis stepwillnotbe

If the

arms

will be in theright

the

until

handle

If the racking

in

counter-

the stop is reached

align

breaker is

a

not

does

the arms

mechanism

position

necessary.

turn,

on

out of

9. Make sure that latches on the ends of the ex-

tended
pushing

into the enclosure.

rails are in the unlatched

on the breaker, roll it

position,

as

far

as

and

it will

by

go

10. Put the latches on the ends of the rails into

their locked

position.

in

I.

Spreader

2. Drawout Rail

3. Breaker Rail

4. Slots

'

10. Movable

Fig. 3.

5. Trip Button

6.

7. Housing Racking
B. Rail

9.

(8041582)

in

Racking Shaft

Latch Link

Racking

2. Position the breaker

intended

A

3.

forward

sheets for standard

est

unlatchandpull forward

of the cubicle.

breaker

the extended

to receive it and engage

special

The

the back for AKRU fused

3.

4.

"spreader"

hooks of the

square-shaped

the door of the

Open

Raise

the

sides are

breakers,

breaker

a few inches above the slots

rail.

Pins

Rail

Arrns

Pin

Position Indicator

Inner Housing

Inserting

provided

is

spreader are

holes

one of the rails inthe sides

until the rail

the breaker

in front of

lifting device.

the

as shown

placed

in the breaker

and inthe

breakers.

breaker

encloswe,

the cubicle

in

holes near-

pins

Fig.

in the

side

and

in

the

11. Push in on the trip button, move the sliding

cover to the right,

12.

Rotate

revolutions, thebreaker

indicator

The

ment

will

control

the

the

show

circuits

is electrically

secondary

the

on about the third turn

run,

will

off switches

13.

nects,

nected;

connect the

atbd.

the breaker

testing.

charging the

are

h the test

which carry the control.

however,

power

this

At

and engage the racking

handle

left upper

the

in

when this

are

operated, the

disconnects engage.

closing spring, until the

actuated,

position,

primary

the

circuits, are

point,

may

electrical

be operated

14. Further clockwise

handle causesthebreaker to travel

position,

in the

of the racking operation,

in

of the

which also

equipment

primary

will be

compartment. During

disconnects on

handle.

clockwise. After about five

be in the test

will

side of the

position

energized

motor

the handle.

of

and

This

position.

compart-

is reached. If

breaker

the

run when

will

will occur

motor

The

cut-

the secondary discon-

voltage,

disconnects, which

are

con-

still widely separ-

control

for the

rotation of

shown on the indicator

the spring-loaded

the

devices on

purpose

the

racking

to the connected

phase

this

fingers

breaker will en-

of

6

gage

the

stationary bar

The opening of these fingers

springswill

ment

in the racking

fali

off

travel,

About

peak

the

which

the

handle

sal

of the handle motion. Approximately

on the handle
ing cycle.

15.

The first

the enclosure,

and

the marks

grease

tracks

engagement.

attained

BREAKER

cause a noticeablyhigher

to

a lesser force requirement

at which

point

three handle

force requirement

the

ends

movement.

should be removed

are required

time the breaker

it

should

the

of

on the

marks

is

stationary

should

The maximum

g/16-inctr.

WITHDRAWAL

the

in

equipment

against the

effort. This will

a stop will be

turns

will be required

and reaching

Upon

without

for the

be completely

disconnect

bars examined.

indicate no less

amount

enclosure.

force

require-

load

quickly

very

to

the

encountered.

between

the stop

reaching

the

any rever-

24 turns

complete rack-

is introduced

withdrawn

fiagers

than

that

on the

1/4-inch

can

of the

end of

stop,

into

These

be

ers.

They should

easily

enough

the area
Iocation

ject

of the

switchboard

tions
connections

iliary

mountingholes
fastens

vertical

posed

versely

ouiline

gives

and

to

reached

surrounding

is not

chosen

to

extreme

Mounting

breaker to

tothebreaker

to the

switch

the frame

These mounting

plane.

on the breaker

a-ffect

drawing

information

a

cover

parts

live

Power

Circuit

be

situated

for

operation and

free space

troublesome.

should bedry

variations

the

breaker

its supporting

or

enclosure,

studs, andmaking

breaker

terminals,

are

If they

the

which is

or door

of the breaker.

if

required

to its

support.

holes

are not,

structure

operation

preparing

on

suitable

Breakers,

so

that

maintenance,

so

that

If it is

andclean

of temperature.

involves

terminal

these

must

furnished

bolting

structure

making

power

board and

are required.

forthe hardware

all be in

strain may

which could

of the

with the breaker

a mounting

preventing

for

GEK-731O

they can

working

possible,

andnot

the

within

connec-

control

power

the same

be im-

breaker.

structure

access

be

with

in

the

sub-

frame

the

arx-

Four

which

ad-

The

1. Trip

ton,

and move

aside to

2.

counterclockwise

the breaker

the

right.

Engage

the

sliding

the racking

direction.

3. ApproximateLy

complete the

breaker to

shown

be

because

on the

evident to the

further

the

of

racking

willbe

to discharge,

latches

out
Iifted

STATIONARY

activated.

4.

To

onthe

of the compartment.

off the

racking-out

the disconnected position.

indicator

person

stop will

a

movement

be

can

cycle,

This

but

will not

withdraw the

ends

ofthe rails,

rails

by the

BREAKERS

Stationary breakers are

mounting

in an

construction.

the drawout

drawout

and automatic

Careful

lection

on

a framework

enclosure

They

type; however,

features,

disconnects

consideration

a location

of

of the

namely,

for

hold

open,

cover in the

handle

24 turns

operation

in the

operating

encountered

be made.

the

"closing

in

and

the

of

compartment

the mechanism

beyond

Towards

spring

willcause theclosing

close the

breaker

The

lifting

intended

breaker.

completely,

pull

and

breaker

device.

or switchboard

customerts

are the same

own design

breaker unit

they do not have

the

racking mechanism

and

interlocks.

should be

mounting

given

stationary

the trip

escutcheon

crank

handle

and bring the

This

but-

in a

wiII

will be

and will

which no

the

end

interlock"

spring

open the

thebreaker

may now

for

panel,

to the se-

be

separate

or

and

as

the

break-

Another

for

the breaker

stand

and

short-circuit

be subjected.
supportedadequately

of support

enough

is

imposed

Manual

ance is

is

operated.

to the

2-l/2

frame.

Since eachupper

of two

stud must

parallel

nection.

connector

with

and lower

cable

connects

connectorb:rrs

the end

wards

yond

the

Control

made

frontarea

board

governedby

requirement

is that

the forces

Connectingbus

for buswork

to the

provided

right

arches

separate

connectors

the breaker

to a terminal

may have

breaker

on

the breaker's

breakers

for

This

from

beyond

provide

stud members,

All

members,

stationary

bars

studs.

across

of the

centerline

both halves
may
connecting

connections

of thebreaker

6, 10

the

requirements

that

currents

or busbars.

of

the supporting

it be

rigid

result

from high

to

which thebreaker

or cable

to

resist

these

or cable

so

that no

must

be located

the sweep

requirement

the centerline

the right

studof

a

solid connection

as

appreciable

studs.

of the handle

will be

of

edge

thebreaker

the

connections

well as

breakers

already fastened

These bars

will

If an

of the upper

bedispensed

base no more

the

of

fastener

on stationary breakers

board

located

(front

or 14

with.

bus

should extend in

than 5/8-inctr

hole.

in the upper

view).

points.

of the

structure

enough

forces.

must

to

momentary

must

also be

points

be

strain

so that

the breaker,

of the

11 inches

breaker

is

composed

clear-

when it

to the

across

an external

will

the two

be shipped

to both

accommodate

upper

external bar

studs,

hthis

The terminal

This

control

will

scheme.

with-

may

close

or

con-

the

case,

to-

be-

are

left

be

GEK-731O,

Power

Circuit Breokers

If the breaker

connections

of

switch.

the

PRE-SERVICE CHECK

Before

first time, it

amination

of the breaker.

breaker

an equipment

should consist

1. Attach

onthebreaker afterpushing

ing the cover aside.

til it

Iocks
closing.

and a

on

stops.

which otherwise

has an

may be made

putting

the breaker

would be

preliminary

This

a

workbench or

drawout

the

of

following:

thedrawout

Turn the

This will

auxiliary switch,

well to

may

compartment.

racking handle

deactivate
would keep the breaker

NOTE: Remember, later,

chanism must

position

serted in the

2.

Remove the arc

examine

parts.

the

it for the

Do

preliminary

not

be set

before the

equtpment.

quencher

possibility

replace the arc

examination

directly

be carried

on

thetrip

to the terminaLs

into

service for the

make a

check

the

handle

cursory ex-

the

of

out with the

extended rails

to the shaft

button

clockwise

the various inter-

that this

back to

breaker

i,ts

original

can be in-

from each

of broken or missiqg

quenchers

is

completed.

external

operation

of

The check

slid-

and

un-

from

me-

pole

and

until after

move in

seem

this, refer

tiiled

ping

tivate

Devices
overload

voltage

("wipe")

to

do so, and

at

to the section

"CONTACT

5.

Make

breaker open Erre

the

thesewith thebreaker

in

devices,

device.

6. If the

MAINTENANCE.

swe that a-ll the devices

category are the

this

the

breaker is

the operation of the

Iifting interlock

that

breaker and that the

not be opened if the

the closing

is charged,

far as itwill

as

7.

securely.

8.

should be checked when

ers

able,

drawout equipment

spring

and

Replace

electrical operation

The

with the

wiII

drawout

the

go

inthe counterclockwise direction.

the

breaker in the

least

1/16 inch.

careful measurement

If they do not

of these instructions

"

used for trip-

operable.

closedto establish

shunt trip,

a

drawout breaker, check

Manually ac-

manual trip, the

and the under-

interlock devices. Make

(3),

pin

sliding cover

breaker is closed.

discharge automatically

racking handle is cralked

quenchers,

arc

Fig.

4,

will trip the

(1),

Fig.

Check

clamping

of electricai break-

"test"

power

position

control

compartment.

confirms

en-

this.

sure

8 can-

that

if it

them

is avail-

in the

3.

Charge

manually

as

far as it

motion

and

the closing

operated, turn the handle

(140

go

will

rdturn

it to the vertical

breaker is electrically

nance handle,

charges the

NOTE: It

align the triangular

make it

4.

Close

closed by

eon.

The

closed by

closing

chanism
tangular
This

move

the stationary
and

solenoid which is located beneath

opening

maybe

in closing

Observe

when it is

Fig. 5, to

ciosing

go

the breaker.

pushing

"quick-close"

pulling

and

may bereached throughthe large

done safelysince none

the difference between

spring.

probably

on the

the

CLOSE

forward

in thelower

in this area.

are

contacts

closed.

spring. If the breaker is

degrees), then

eounterclockwise

reverse the

position.

operated,

use

the

turn the camshaft which

nill be necessa',ry to

socket

end of

electrical

when the breaker is

The

in the handle to

the

shaft.

manual breaker is

The

button

on the

end of the escutcheon.

main

in the escutch-

breaker may

armature

parts

the

of

(See

Fig.

position

the

contacts should

If the

mainte-

be

of the

me-

the

rec-

that

64,.)

opened

A breaker may

manually

result in the same

as the

is in the rpay energy

how i.t is released.

and

'NANUAt

Manually

front-mounted

with

the mechanism

sets

spring.

either cranking

degree

The CLOSE

to close

used
button to open

If

of

equipped

breaker

relay.

or

OPERATING

THE BREAKER

be equipped to

or electrically. Both

fast-closing movement as far

contact

swing) or

may beclosed remotelyby a

action is concerned. The variation

is stored in theclosing spring,

CLOSING

operated

AI(R breakers

handles. Handle

and

A complete charge

handle

the

three cycles

the

them.

with

mounted

breaker

closing solenoid, a

a

button,

Before this can be

charges

fully

is

through

(50-degree

on

contacts and

done, however, the

operate either

types of operation

constructed

are

operation re-

the closing

accomplished in

one cycle

the escutcheon,

(135-

swing).

the TRIP

manual

control

switch

is

8

Power Circuit

Breokers, GEK-731O

1. Arc

Quencher

Fi.g. 4.

Clarnp

(8041848)

Z. Clarnp Screw

Breaker with bqrriers

3. Breaker Position

and arc

quenchers

Interlock

remoued

Fig. 5.

(8041831)

maintenance handle

Using

to turn

camshaft

GEK-731O, Power

Circuit Breokers

closing spring has to

closing solenoid is

supplied unless specified in the breaker

ELECIRICAL

Applying

the closing motor

the motor

of

spring is completely

spring

the closing

leases

Apush-button

CTOSING

control

circuit

is mechanically

circuit activates a

holding latch.

the

closing

electricalbreakers.

vided

only ifspecified in

plied,

it is located

When

closed

motely,

the

breaker is

either

or at

push

inthe right

in service,

by

energizing the closing

the

button

switch

so equipped).

OPENING

A closed breaker

trip latch

the secondary latch

are mounted

device.

(11),

Fig. 12, is moved

on the trip shaft,

be charged by

optiona-l

an

power

on electrical

does not

charged and

held from discharging

This

the breaker

accessory

immediately

breakers.

occur until a-fter the

overcenter. The

solenoid

switch

may

feature,

be

however, is

order. If sup-

side of the escutcheon.

all electrical breakers

breaker location

in the

THE

BREAKER

will

open

(14).

A number of trip

by

escutcheon

(trip)

off the

one for each tripping

hand. The

is not

and

order.

energizes

Cutoff

which re-

provided

circuit

operation of

(if

whenever

roller on

paddles

until

on

pro-

are

re-

ttre

the

\ri

/-

"l

a\^.

\

\N

\\l

It\

tl

12

Fig.

6A.

a\

t\

\'\

\-

f..

I

.rm

(227A8290)

Closi.ng

spri.ng

interlock

INTERTOCKS

interlock

Some

Standards

optional

standard interlock devices described in the fol-

The
Iowing

ers.

locks.

cLoSrNG

Closing spring interlocks

tection

and

overcenter

after

closure.

springs

quire

Figure 6A shows

by

the racking

approaches

10

and

and

paragraphs

Stationary

SPRTNG

against

the breaker

Drawout breakers

fully charged

this

sa-fety

devices are

required by

Certifying Authorities;

intended only for

used only on drawout break-

are

breakers

INTERTOCK

the hazard

spring

has

feature.

mechalism.

the

"disconnect"

have no

of a

being

been

withdrawn

prior

to closing and

how

the interlock

help

accidentally

As

special

(F|GS.

completety

have

applications.

required inter-

6A AND 68)

provide

to

from

their

is

racking

position,

Industry

others are

pro-

charged

released

its en-

ciosing

thus re-

activated

(1)

arm

crank

(2),

I

'l

l.

Racking

2. Crank

3.

Le:'er

4.

Spring

5. Closing

through

tate

clockwise,

lease

lever

operated

When the

charged

breaker

tionless

plate (9),

by

the

sliding

Arrn

Release

Solenoid

Fig.

68.

connecting

actingagainst

(4).

by

the

closing

closing

by

the interlock,

to close.

because

the mechanism

Fig.

cover

Lever

(22748289)

linkage,

This is

The contact

68,

(10)

the same

solenoid

spring is

which

to its

6. Roller on

7.

Closing

8. Adjustable

Blocking Plate

9.

10.

Sliding

Blocking

causes

lever

the

closingspring

lever

(5).

automatically

it

does not

arms remain

is held

blocks

normal

position

10

Ratchet

Spring

Link

Cover

plate

(B)

to

which is

dis-

cause the

mo-

"trip-free"

the return

unless

ro­re-

of

Power

Circuit

Breokers,

GEK-731O

breaker

the

nected"

within

inaccessible,

accident.

RACKING'NECHANISIYT

(FtG.

8)

A drawout

not be

must
contacts
automatically

the escutcheon

Unless

inghandle

link

by

in the cover

the closed

Another

that the

manual trip

the

keeping the

of the

ment of

Iong as the

Another

interlock. This

is in the

position.

mechanism

the

This

minimizes

and

breaker connected

allowed

to

are open. This

locking closed

the breaker

when

cover

this

cannot be

(2),

Fig.

ia response

positi.on.

aspect of

openingmovementof

breaker

mechanism

the contacts. This

drawout

interlock

used. Lockingisaccomplished

8

which

button

"trip-free",

will

handle is engaged.

featwe

makes thebreaker

"test"

limits

frame,

position

motion to

which

the

INIERLOCKS

to a

move unless

requirement

the

is closed.

is moved,

to the

the interlock

the drawout

moves

down

main

the slidingcover

into the tripped

so a closing

not cause

any closing

condition

is the

or the

are

possibility

power

the breaker's

sliding

"con-

those

relatively

circuit

met by

is

cover

parts

of

rack-

into a notch

being

shaft

arrangement

cams

position'

cycle

move-

prevail

will

breaker

position

"trip-free"while

moving between the

nected"
between these

an

which

the

This

keeps the breaker open even

position.

two

is coupled to the trip

"ramp"

cam

holds the mechanism latch out of

are discharged.

OPTIONAT INTERTOCKS

optional

in

in

is

as

The

interlocks.

door

mounted in the equipment

are

vices
the breaker

Iock

the

sition.

all breakers,

On

lock the breaker

to

padlock

the

in

slot

trip button

cannot be closed.

Stationary

interlock

the

shows

the breaker is open. Pin

path

of

enclosure. Padlocks

t'inner"

through

side of the escutcheon. This

the

inthe depressedposition and

breakers

illustrated in Fig.

as

plate

end

the lock bolt

"test"

When

positions,

position

the breaker is

a link on the breaker,

shaft, is displaced by

in the side of

if the closing

See Fig.

interlocks are

On

house in the

assembly

4.

drawout breakers.

possible

is

it

open by

placing

the trip button

may be

of the

(3)

(4),

is held away from the

which

the

and

the breaker

interlocks

key

and

may

"disconnected"

use

to

the shackle

hole

equipped

7.

This

main

can be extended,

"con-

at

any

housing.

position

springs

these de-

part

are

be used to

padlocks

and

out the

holds the

the breaker

with a

illustration

shaft

point

and

and

of

po-

of

key

when

aI-

1 . Lock

End Plate

2.

3. Pin

4. Lock BoIt

5. Pin
Link

6.

Fig. 7.

i

)

\

(134C2184)

Key inteflock

stati.orwrl

for

-t-

\

\

\

\

\

I

6

breahers

11

GEK-7310,

Power Circuit

Breokers

l.

Sliding

lowing

makes it

this

sible

sembly
causes

bolt, which cannot

breakers

used

Minor differences in

exist, but most of the devices

the key to be removed. Extending

push

moves

against

breaker latch, and

the

pin

(5).

to close the breaker.

When

is

away

(3)

pin

Accessories

from link

to move into the

then be extended.

ACCESSORTES

available

(6)

for use on the AIG-50

breaker is closed, the

the

are, in most cases, the same devices

throughout

the entire line of AK

mounting and location may

tical.

L2

Cover 2. Locking Link

Fig. 8.

(134C2179)

Drawout interlocks

the bolt

Through

the

makes it impos-

linkage,

placing,

dealt

structions; only

function it serves

SHUNT TRIP

and

metal

torsion spring

the

path

of the

plate

lock's

as-

its coil

which

in series with

made

ondary disconnects

arxiliary switch and

breakers.

bottom

themselves

breakers.

are

iden-

3. Trip

Maintenance operations, such

adjusting

and

in

with

The

is

the

shunt trip device opens

energized.

is

closed only

Button

these components wili be

maintenance

description

a

be

will

dealt with

An

when the breaker

portion

the device

of

the breaker when

frA't

the device coil.

the external tripping source

to

on

drawout

breakers, or to the

terminal board on

the breaker,

On

the

of

breaker frame in

the

shunt

trip

a

as adding, re-

of these in-

and

the

here.

auxiliary switch,

is

closed,

Connections

through sec-

stationary

is mounted

central location.

are

on the

is

Power

Circuit

Breokers,

GEK-731O

UNDERVOLTAGE

The

undervoltage

its

coil is de-energized.

connected directly

terminaL

remains

breaker

duced to Iess

An open armature

board.

energized and the breaker

"Drop

out"

tripping, occurs when the voltage is re-

of closing.

closing, if the voltage

nominal

reason
undervoltage device may

that it wiII not cause

value.

the breaker is disconnected, and

If

the breaker is to be operated manually,

DEVICE

device

The leads

to

secondary disconnects

Under normal

percent

60

armature,

of the

than

willrenderthe

The armature

85

is

be tied or wired down

tripping.

trips the

breaker

the

of

conditions, the

may be

coil

with resultant

of the rated voltage.

breaker incapable

"picks

percent

up" ald

or more

for some

MAIN

SHAFT

(BREAKER

CLOSED)

when

are

or to

coil

closed.

allows

of its

the

so

STAT]C

In

addition to

tripping

a

time-delay

mounted

Fig.

21.

other than

former

breaker)

rating

connected across

of 100

When

static delay

connected across

static

box through

breaker.
will be shown

more

No

should be used

delay unit.

The static

furnishedwitha

on

wiring diagram,

windings

motor

undervoltage

motor load.

TIIYIE-DEIAY

device

undervoltage

time-delay

If the.aic

208/240V

(also

remotely

must

be

volt-amperes.

installed,

box.

The secondary

on the

than

UN

DERVOTTAGE

the

instantaneous

mounted

on the

unit.

control

ac,

mounted

used. This

the voltage

terminal.s

coil

The

terminaLs

the secondary

breaker

undervoltage

one

includes

Its

voltage

a control

must have

No. 1 and

of the tripping

No.

disconnects

wiring diagram.

in conjunction

time-delay undervoltage

thermotector

Fig.

causes the thermotector,

windings,

to

device

open. This

on the breaker

controlunit, as

22.

undervoltage

breaker,

the

a separately

diagram

with respect

to be monitored

4 and

disconnects

is

shown in

is

anyvoltage

power

minimum

a

No.
No.

to be

tripping

with one static

can

Overheating of

imbedded in

de-energizes

and drops

static

trans-

to

2

of the

unit is

5

of the
of the

used

device

time-

also

shown

motor

the

is

be

the

the

the

Fig.

(0134C2181)

9.

lockout deuice

HOLD.IN

Holding

link on

electric

ETECTRIC

The

voltage device

its mechanism

voltage
thus

Once the

trip the

mechanical

of the device.

LOCKOUT

electric lockout

to

i-f the

device

cannot be

breaker

coil

closed unless

breaker

link is used

See Fig.

vides a means

breakers

time. Each

series
other breaker

On

arrangement

closing

vided to

ure 10

located

cutcheon. The

access to it.

so that they

undervoltage

with

a

'8"

for

breaker

each

is made

the

with

aLlorr

shows this

in the

'?start-up"

opening in

breaker doormust

DEVICE

device

keep the

breaker

not

is

is closed, Ioss

because,

utilizes

breaker

from resetting

is open

energized. The

voltage

voltage

of

in the

closed

to hold down

9. This

of

electrically interlocking

cannot

arrangement

be closed

coil may

auxiliary

cross-interlock

having

switch contact

purposes.

an electric lockout,

which will

coil de-energi-zetl.

device.

on

"dead"

The

the lower

systems. Fig-

push

part

be opened to

under-

an

the

and

is on the

under-

breaker

coil.

not

wiII

position,

the

armature

pro-

two

the

at

be

same

wired in

on the

an

allow breaker

is

shown is

the

of

pro-

es-

gain

13

This

slide

a

GEK-731O,

Power

Circuit

Breqkers

+-i!Lr-

i+.++-l

T l-*r 1

tr ll

'-L-

-rL'

Fig. lQ.

AUXITIARY

AII

breakers

SWITCH

electrically

having shunt trips

operated

iliary switches. Depending

of the

tain from two to

has

tacts

or

Drawout

wired

may be wired

breaker's

ttAtt

one

are

openedor

closed.

breakers

to secondary

application,

six stages. UsuaIIy,

contact

"B"

directly

and one

closed

contacts are

have their auxiliary

disconnects;

to the switch

/-lr

i.i;) Y

\-:/

Q134C2182)

electric lockout

manual

breakers

are supplied

upon the requirements

the

ttBtt

contact.

as the breaker

the reverse

stationary

and

switch

terminals.

with

may con-

each stage

ttAtt

is opened

of this.

contacts

breakers

',

'"/,/

\\

\.

deui.ce

\

\

".

//

Arm.ature holdi.ng

action

It will

action of the

aux-

con-

tective relay

sult in the remote

The

pushing

shunt trip. In the

contact of

parallel
the shunt-trip circuit.

turn off the alarm.

also

\@w

mechanismfor

automatic

of one

not be activated by

bell

in

with

its

of

shunt trip.

energizing the

alarm

alarm

manual trip or by

the

A

action.

circuit may be turned

latter case, a normally open

the bell alarm switch

"A"

auxiliary

Closing

the

PUSH

TO

IN

DEFEAT

LOCKOUT

protective

manual tripping or

remotely

shunt trip will

devices.

mounted

not re-

off by

energizing the

must be wired in

switch

the

contact

brea-ker will

the

pro-

in

BELI AIARM

give

device is used to

This

the breaker's

of

having

a

tripped

remote

open

t4

indication

through the

bell alarm device may be equipped

The

Iockout iink

the bell

supplied

alarm device is reset.

The bell alarm

only when

which

will

lock

breaker open

the

is not a standard

specified on the

with a

until

device and is

breaker order.

Power

Circuil

Breokers,

GEK-731O

SAFETY

WARNING:
BEGINNING

ON THE

CONNECTED

SOURCES,BOTH

AND

IIOPENII

WORK IS DONE

CLOSING

ALLY

SHAFT

SPE/NG DISCONNECTED,

MAY

MAINTENANCE

FIG.

BREAI<ER,

THE BREAKER

SPftING

DISCONNECTED

OF

BE

CLOSED

5.

PRECAUTIONS

BEFORE

ANY

FROM ALL

POWER

POSITION.

ON THE

THE MECHANISM.

HANDLE

GENERAL

Breakers

plementation

periodic

A

frequently

breaker

Itwould

year.

a

an area

phere,

should

should

of a

inspection

be

systematic

routine

an inspection

will

dependonthe

be

well

to inspectany

If it

is frequently

of high humidity

the frequency

be increased.

tions, inspections might

BREAKER

INSPECTING

MAINTENANCE

IT

MUST

AND

CONTROL,

MUST BE

ALSO,

BREAKER,

IS TO

of

Under

BE MECHANIC-

FROM THE

WITH

THE BREAKER

SLOWLY,

cared for

maintenance program.

is

is made

circumstances

operated,

or

a

maintenance

be monthly.

USING

AS

SHOWN

through

recommended.

of an

breaker

or installed

dusty,

extremely bad

oR

WORK

BE DIS-

VOLTAGE

IN THE

BEFORE

THE

CAM-

THE

THE

IN

the im-

individual

of its

at

least

once

dirty atmos-

inspections

condi-

TIAINTENANCE

service of each breaker in turn

maintenance,

a high

reasonable stock
be

a

level

good

means

will be done

Maintenance

of cleaning

breaker components.
tions will comprise
erations

after new

useful

inally

How

use.

in

spring from the mechanism's

inch

and

parts

for

adding accessories to breakers not

equipped

NOTE:

ment

must haae

cranked to the

operate nonnally.

Seruice

ARRANGING

Figure LL shows how

wrench is used

an

is

excellent means

of service

reliability. Maintaining a

of recommended

for inspection and

of ensuring that maintenance

quickly.

work

and replacement

descriptions

any adjustments

are

installed.

with them.

Breakers

in most

will,

of worn

Mostof

oaithdrawn

thefollowing instruc-

that

of replacement

They will be equally

from

their drawout

"connectedt

See Step

Check" instructions.

THE BREAKER

srow crosrNG

to disconnect

camshaft.

to remove

the

of establishing

parts

spare

cases, consist

damaged

or

may

be required

equip-

mechanism

position

7

of

ttPre-

to

FOR

the closing

A l/2-

hex-head

bolt in

will

work

op-

orig-

Amaintenance

all

visual

ing and

trically

cycle should be

be

made

arc

Contact wipe
maintenance

If

found

moved

latingsurfaces
that could

If

contacts

It

cluded

breakers

ing

maintenance

program,

check

opening operations.

operated, at least

contacts

of

quencher

grease,

dirt,

on any

by

a thorough

cause a

breaker has

a

should be inspected.

good policy,

is

in an installation,

to install

providing

inspection

and the

observed. A

and

plates

side

should

section

parts

be checked as

dealing

or

any other foreign material

of the breaker,

and careful

shouldbe

loss

interrupted a

if

a

in the

work.

for

should include an

observation of a few

the breaker

If

one electrical

close inspection

the

inner

surfaces

and inner components.

described

with contacts.

it should be re-

cleaning.

checked

insulating

of

number

to

place

In

periodic

a

for any conditions

properties.

short circuit,

of breakers

have

one

or

breakers

of

cases, a

such

withdrawaL

more

over-

clos-

is elec-

operating

should

the

of

inthe

is

Insu-

its

are in-

spare

requir-

rotating

from

Fig.

11.

(8041

8

33) Dis

cormecting

closing

pring

s

15

GEK-731O,

Power

Circuit

Breokers

the bottom

operation

has

been

of

extension.

ratcheting

the

camshaft,

breaker

the

(See

ton must

should

roller

Fig. 6.A.

be

solenoid

When this

continued.

Closing

action

way of

contact

procedures

the

erate

sliding
inspection

of the mechanism

judging

relationships.

breaker

general,

In

lubrication.

surfaces

D50H15.

should

be

of the

must

discharged

springassembly.

bedone

After the

maiatenance

closing

be

operated

on

the ratchet

this

At

)

pushed,

must

is

the

pulled,

be

done,

breaker

the

described

in

this

manner.

TUBRICATION

the

circuit

should

periods

Sliding

lubricated

with

silver-plated

onlywhen

and

is at

its

bolt has

handle

the

stops against

point,

been

may

breaker

only

the manual

or the armature

move

the

to

slow

closing

slowly,

while

and contacts,

correctress

Some of

later

of mechanical

will involve

breaker

Mechanical

be lubricated

a

with

bearing

thin film

GE lubricant

part

This

the

closing

shortest

removed,

be used

of the

spring

condition

to turn

slowly.

to

point

the

prop

the

Ctose

of the

prop

the

action

observing

where

closing

away.

may

is a

the maintenance

operating

requires

at

of

GE

contact

points

the

regular:

lubricant

surfaces

Db0H4?.

mod-

the

The

link.

Uut-

be

the

good

and

and

Hardened

latch

underthe
surface

On drawout

disconnect

Specification

grease

and

bearing

CAUT|ON:

SHOULD

ACCUMULATION

NOTE:

bearing

the

cotton

and

surfaces

ALL

BE

REMOVED

The

use

surfaces

raaelings

bearing

of the

bearing.

breakers,

studs

should

D50H47.

REPTACEfiIENT

OF COfiTPONENTS

tvtEcHANtstvl (FlGs.

The

mechanism

cam

rotates.

13;

clockwise

in

12,13,

closes

(Counterclockwise

Fig. 14.

dirt

should

by using

.EXC,ESS

OF DIRT

of

cotton

should

may

become

surfaces

the

contact

greased

be

AND

ADJUSTMENT

AND

AND

the

)

be

removed

kerosene.

LaBRICANT

TO AVOID

ANY

OR DAST.

waste

be

and

ACCESSORIES

breaker

to

auoided,

entangled

destroy

surface

with

GE

l4)

in

Figs.

wipe

as

the

Grease

when

12 and

from

of

the

the

16

4

5

Fi.g. 12.

6

(108D8131)

7

Electrical

I

breaker

mechalnism

t2

lt

t0

l.

Closing

2.

Prop

3.

Carn

4.

Carnshaft

5.

Carn

6. Holding

7.

Ratchet

B.

Driving

Gearrnotor

9.

l0.

Trip

1

1.

Trip

12.

Insulated

13.

Main

14.

Secondary

15.

Opening

Spring

Roller

Pawl

Wheel

Pawl

Shaft

Latch

Coupling

Shaft

Latch

Spring

Power Circuit

Breokers,

I.

2. Prop

3. Carn

4.
5, Carn

6. Holding Pawl

7.
B. Driving Pawl

l0 .

.

11

12. Insulated

l0

I3. Main

ll

14.

t3

I5. Opening

16. Manual

GEK-73\O

Closing Spring

Carnshaft

Roller

Ratchet Wheel

Trip

Shaft

Trip Latch

Coupling

Shaft

Secondary

Latch

Adjustrnent

Link

Spring

13.

Fig.

TRIPPED

(108D8130)

Manual

2.

3. Carn

4. Carnshaft

5.

mechanism

Prop

Carn

Roller

RESET

10.

Trip

Shaft

1 1.

Trip Latch

I 2. Insulated

I3. Main

14.

Shaft

Secondary

Coupling

Latch

CLOSED

Fig.

(108D8132)

14.

Mechanisnt

t7

GEK-731O, Power

Circuit Breokers

Fixed centers are shown

prop

The

holds

has

the cam roller in

been raised by the

holds the
to move

On

shaft of

ing the driving

ratchet wheel.

Fast

goes

over center, unless it

(not

shown)

wheel.

position

in

a

When the

terclockwise, a

is free to

prop

in

the

out of the wav

electrical

gearmotor

the

cam

acting against

Figures 12

breakers,

pawl

action occurs

just

manual

and

over

strong torsion

shaded in Fig. 14.

rotate

cam.

position

of

turns the

to

reciprocate,

13

center.

breaker handle'is raised coun-

on the cam shaft. It

place

after the cam

light tension

A

shown,

the cam

roller.

the eccentric

camshaft by caus-

advancing

the

when

closing

is held by

a stop on

the

show

closing

roller

spring

but d.llows it

output

the

spring

prop

a

the

link

ratchet

spring

spring rotates the

driving
the camshaft.

position pulls

rotating the camshaft.

'YlECHAN

(FrGs.

If components

new

ponent
venient to

pawl

ISIVI REPTACEMENT

rs

Figure

complete

general

If

a

replacement

assembly

Returning

the chain on

AND

16t

16 shows

until

t engages a notch

th

handle to

the

sprocket segment,

the mechanism

of this unit require

sub-assembly must be installed.

overhaul involving

extensive com-

is undertaken, it may

separate the major

breaker sub-assem-

blies as shown in Fig. 15. If this

secondary disconnect

assemblies

should be removed

first.

ratchet wheel

The

vidual component
fastens it to the

may be

by driving out the

camshaft.

replaced

sprirg

on

its normal

sub-assembly.

replacement, a

be con-

is done, the

as an indi-

pin

which

(108D8127)

15.

Fig.

18

Assembly

of

frames,

quenchers,

arc

and secondany

disconnects

Power

Circui| Breokers,

GEK-731O

Fig. 16.

LATCH

The

is set byan adjustment

mechaaism

three

and

causes a

made,
screwed,

'VTANUAt

The

adjustable

of the
this iinkis

in the

center

dle of

enA ?/16-inch

The

having the link too long,

extend the closing

or it can be

on the up-stroke

(8041918)

ADJUST'VIENT

position

reset

Mechani.sm

of the trip latch

screw on the left side

frame. The adjustment

one-half turns

closed breaker

the screw must

three

and

one-half turns.

HANDTE ADJUST'NENT

manual handle

controlled byturninga double-ended

the link.

of

the stud

handle

allows

wrench.

can be

too short

adjustment is made

(16),

link

the engagement of

out of

spring

and

the handle.

of

subassembly

(11),

Fig. 14

of the

is correct if

the adjustment

of
to trip. If this check

then be

Fig.

A hex section in the mid-

adjustment

set

13.

back,

The

in which case it wiII not

enough to

not engage the camshaft

go

over center;

screw

or un-

by means

length

stud

an open-

either by

it.

the best
stroke of the
in the

rarge

The

confined

of the

setting in

wrench

space available.

the

CONTACT ftIAINTENANCE

CoNTACT REPTACETVIENT

Brea-kers whose

terruption

of

the replacement

rule

for determining the need

Ioss of

one-half or more

tip material.

contact surface does not indicate

to carry or interrupt

application

high

currents may

of their contacts.

Roughening or Iight

The contact arrangement

arcing contacts, two
main

contacts.

movable

Two
contacts in closilg.

These

contact

Arcing contacts

removing

pivot

insulating

pin (?)and

arc

is

moved

pieces

purpose

diameter

while

end

of

ing it in

tact stop) and

the

be

(10)

removing
low.

(6).

runner

htermediate

by disconnecting

on the springs

holdhg

of the contact. A

outer

A

spring

ordered

Contact arms are

connecting

arc

the

When reassembling,

spacers on the

the insulatingwashers

fastening

engaging a

of

mnner

(2)

and

of 1/16-inch.

the contact, it may

position (with

extending

end

of the contact.

puller

under

the

is available for this use

Cat. No.

them to the insulated

fasteners and

adjustment

middle

imparts

of the mass

current.

intermediate contacts, and

are

arms

(1),

Fig. 17,

(5)

ends of

screws are

main

(9)

have a

spriag

When the spring is

contact is replaced by hold-

its inner end behind

and

removed

is

of

15-degrees movement

(FlG.

requires frequent

of replacement is

provides

the stationary contacts.

act against

degrees

300

the

range. Each

17)

eventually require

pitting

any loss

general

The

the contact

of

of

of the

ability

sets of two

the stationary

are released by

and

contacts

their

puller

engaging the spring

016585712G1.

pins

arcing

the

make sure

the

arcing contact

(8)under
replaced.

springs.

small

having

be lifted

the lower

(3)

The end

hole

the con-

and

contact

that the

are

for

a wire

pulled

off the

by drifting out

link

and

pivot

the

from

with

in-

the

six

re-

the

on

may

pin

then

be-

the handle stroke

If

sp::ing, the maintenance handle

plete

spring charging.

closed and opened and

the wrench engaged, and looking

With

the breaker,

lengthen

the

turning

link.

The opposite motion

does not fully extend the

The

the handle adjustment made.

the wrench clockwise

can be

used

to com-

breaker can then

down

will shorten

be

on

will

When replacing the arms, make sure that all

spacers, springs,

their original

Right

move and

pin

the

of

insulated

position.

angle

tru-arc

replace

which

coupling.

and

washers

pliers

the tru-arc

connects the contact arms

are

returned to

are

needed to re-

retainer on the

end

to the

19

GEK-731O,

Power

Circuil

Breokers

.

I

Arcing Contact

2. Interrnediate

Main Contacts

3.

bolts in the

two

The

screwed in until

CONTACT

When

justed
between

velops when

that does

"Wipe"

contacts

sured

on a stationary

the

and

is closed.

since

a sliding or

motion.

ADJUST'IAENT

contacts

sure that the

to be

the movable

the breaker is closed.

this is called

distance through

is the

move

as

position

the

distance between

the

Actually,

contacts

"scrubbing"

4.

Contact

6.

contact

they bottom.

are

replaced,

proper

and stationary

the

breaker closes.

the

when

contact when the

the same

of

point

the wiping

over-travel.

action

Contact

Arrn

Arc Runner

Fig.

pivot

Contact Pivot

(1s4C2174)

17.

are

Arcing

afm

they must be

amount

The

"wipe"

which

point

the

breaker

when

motion

"Wiping"

to the contacts

of

contacts

adjustment

adjustment.

stationary

the

is mea-

It

of

is

breaker

the

is

imparts

to be

ad-

force

de-

contact

open,

greater

7. Arcing Contact Pin

Insulating W'asher

8.

Contact

9.

Contact

the intermediate

to the

where

arc runner, and

it is dissipated

The

ment

on

1.

Thebreakermustbe

ers

removed.

2. Place

material;
and intermediate

two-inches

about

the breaker

when

mediate contacts do

3.

Close

place.

in

"over-hangs"

I0.

11.

Spring

assembly

contacts, to the

rz.

finally

and

extinguished.

steps to follow in

AI(R-50 breakers follow:

making the wipe

open

a thin

suchas

sheet

mylar,

strip of tough

or

over

contacts. This

and must be

rvide

is closed, the

not make contact.

the breaker with the

Examine the

below the

insulation to

intermediate contacts.

Coupling Pin

Insulating Coupling

Adjustrnent

Stud

arcing contapts,

quencher

to the

the

arc

adjust-

andthe

arcquench-

insulating

stationary arcing

strip should

placed

arcing

insulation

make sure

and

so

inter-

held in

be

that

it

The wipe

makes correct

results from interrupting

the

of

20

arc

adjustment on AKR-50

the

transfer

action of

fault current.

is its forced sequential

movement from

breakers

the arc which

also

"Transfer"

4. Attach a continuity

the upper and

not an

cise

ohmmeter.

an

lower stud. Use

indication.

Iatter does

The

checking

means between

abell-set or a light,

give

not

as

pre-

Power Circuii Breokers,

GEK 73lO

5.

Facing

clockwise uatil it is indicated that the main

stud

contacts have parted. A ?/16-inch end wrench fits
the hex

6.

Slowly

main contacts

the

7.

Turn

point

2?0 degrees.

distance from flat to

the hex section

8.

Trip the

and

remove the

It is rec ommended

in the

the breaker, turn the wipe

section on

the

stud.

the stud counterclockwise

turn

touch.

iust

the stud counterclockwise from this

will be 4-l/2 times

This

flat or

of the

stud.

breaker

insulating strips.

that this

course of routine maintenance

from

to

avoid

adjustment be

accidental

adjustment

point

to

inspections.

until

the

point

on

tripping

c he cked

COMPONENTS AND ACCESSORIES

AUXTHARY SWTTCH

auxiliary

The

right

side of the

main

the

justable

shaft

Iink

which

(FrG.

18)

switch is mounted

mechanism

operates the switch through an

connects it to

frame.

the

the upper

on

A crank

switch crank.

on

ad-

I

;l

ll

ir

)

Replocement

switch may

The

two bolts

The replacement

shaft
shaft

is

open.

If

which

so

set

points

a

switch is added

the adjusting

fasten it

the arrow head

that

as

shown in

tink

This is connected

tened by means

lustration.

Adiustment

of

If the adjustable

should

between

be

pin

After

should be checked.

the contacts toward
normallythe

before installing,

set,

centers.

installing

contacts.

'rBrr

be dismounted by removing the

to the

switch should

mechanism

have

its

on the end

frame.

crank

the

of

Fig. 18 when the breaker

to a breaker

having

none,

will also have to be installed.

a

cotter

link

mainshaft

pin

shown in

as

is installed, its length

to the

at

a new

Viewing

switch, its operation

the switch from above,

the front of the breaker are

Even if a special switch

and

crank

the il-

6 3/8 inches,

fas-

I . Main

2.

3. Adjustable

Fig.

is used, it is always

stages nearest the

the

"A"

"8"

"slow-close"

use

Shaft

Crank

Shaft

(22748296)

18.

aiew

Link

from

Auxili,a4,

left

-

the case that

crank

front, and the

contacts
contacts

To check

of

are closedwhenthe breaker is closed;

are

closed when the

the setting, arrange

as

described

a continuity tester, observe

contacts towards

"A"

the breaker contacts when

this

point,

the breaker

range of having a

in l/4-inch.

is made by disconnecting

adjustable

link

touch.

should be within the

to

end of

required.

At

being

wiped

Adjustment

the

switch

breaker

have

the

page

on

the switch

and

varying

t+.

(

Contacts

Contact s

and linkage

open

the first

contacts to

"B"

the back.

breaker is

brealer for

the

15.

Through

the

"A"

open.

position

contacts

arcing contacts

1/4-inch

the upper

its length

two

the

of

gap

as

2l

GEK-73\O, Power Circuit Breokers

SHUNT TRIP AND t'NDERVOTIAGE DEVICE
(FrG5.

mounted

A

devices,

voltage

Re

devices,
mounting

19 AND 20)

As shown in the illustrations,

tothe underside

breaker may have as many as

plus

device.

plocemenf

secondshunt

a

If it is necessary

the easiest

braeket

(3),

of thebreakerfront frame.

tripor

to replace

procedure

Fig" 19,

or

these devices are

each

one

a

secondunder-

add

one of these

is

to remove

from the breaker

of these

the

frame

If
ing bracket

(4)

and

a

replacementor

will be supplied

If a second shunt

(6)

vice

additional

bracket

used

frame.

is added,

bracket

is fastened by two

to fasten

If the second

device, a new

plied.

t}tebuffer

andremounted

This is

assembly

remove

the buffer

buffer

required for clearance.

together with the number

the device

newdevice

(5)

trip

this is mounted

(?)

as shown.

assemblv to the breaker

device added is an undervoltage

assembly block will be

mustbe

taken

from the bracket.

is

ordered,

with the device.

or undervoltage

by means

This

of the hex head

In this case,

disassembled,

off,

two under-

a mount-

additionaL

of an

bolts

sup-

de-

(8)

li'-/

4r+ |

l3

9

i
I

I

I

3. Mounting

4.

Breaker Frarne

5. Second

Shunt Trip

7. Additional

8. Fasteners

As

sernbly

Buffer

9.
.

I0

Arrnature

.

1I

Magnet

12.

13.

Paddle

Trip

Second Trip Paddle

Bracket

Bracket

for Bracket

to

tl

5

19.

Fig.

22

(0108D8125)

Shunt

trip

mounting

-'1

,Lt'7

ill

rill

Power

I

g

Circui| Breokers,

GEK-731O

voltage

buffer,

faces

sion carefully

breake r

Adiustment

device.

carefully

the threaded members

of

w ir ing diagram f

20.

Fig.

Before disassembling

measure

the

on

the distance

new

assembly.

the

or

and set

coil lead connections.

(0108D8126)

the

original

between the

this dimen-

Refer to the

K

Underuoltage deuice

If the

check the mounting fastenersto nake

reasonably tight. If they

paddle

tance between the trip

trip

bending isnecessary,

done.

on

paddle,

mounting

trip is not

shunt

the trip

and recheck for

2. Undervoltage

4" Breaker

5. Second
8- Fasteners for

q

tz-

I3-

6

rb.

to

shaft

arm of the, device and the

be

Frarne

Undervoltage

Accaal'lrr

Buffer
Trip Paddle

Secorrd Trip Paddle

Adjnstrnent

Electrical Interlock
Lever

Locko,ut),

Check

Garrge

successfuI

(Undervoltage

Point

Bracket

Screw

for

Wire

in this test,

they

sure

are, then bend the trip

slightly

careful thatit is not

reduce the dis-

positive

trip. If this

over-

are

these devices are

When

positive

their

demonstrated.

placing

magnet of

armafure

a

ability to trip

This is done

l/S?-inch

the device

trip the breaker.

to

shim

between the

and

installed

the

breaker

the

on

manually operating

replaced,

or

must be

trip by

shunt

armature

and

the

Undervoltage devices; trry fte

urrmature opens. This

armature to

extension
the front

frame

strike

on the other end

of the

breaker) extends:

and limits

causes;

paddle

the

tfie mov.eulentt

breaker when the

an

extension on the

on the trip

of'the arm,ature

ttrough the device

of'the

shaft.

armafure.

An

(towards

23

GEK-731O,

Whenthe
against

check

To
down.

inserted

be

released.

ture

iscorrect,

(16),

Fig.

inside

to be

If the

tripping

paddle

furns

half

When

breal<er

betweenthe

ance

'NAINIENANCE

UNDERVOTTAGE

FOR

the event

In

lowing

whether

static

Power

armature

top

the

positive trip,

the end

against

The

20.

the slot.

undervoltage

ability,

assembly

until the check

undervoltage

the

mechanism

checks

the magnetic

time delay

Circuit

is released,

the

of

slotthrough

the

at/}2-inch

of

the

top of

If thistrips

place

toinsert

that only

Note

device

adjustment

the

may be

is reset,

trippaddle

STATIC

OF

the device

pecommended

ztre

device on

is the faulty

unit

Breokers

armature

diameter

the slot,

the breaker,

the tip of

does

turned

is

zuccesSul.

device

there

andthe

DETAY

(FlGs.

2l AND

fails

extensionstops

this

which

protrudes.

it

should

wire should

the

and

the

is

thewire

not

screw

in

is

closed

device

pick-up, the fol-

to

the breaker

component.

shown

the

have

of

increments

be clear-

must

armature..

DEVICE

22)

determine

to

held

be

arma-

setting

at

is

wire

positive

the

trip

of

t\e

and

the

or

1.

Check

on static

the

box.

Device

a.

Device

b.

Device

c.

2.

Check

undervoltage

mate voltages

208-volt,

a.

230-volt,

125-volt. d-c

b.

250-volt, d-c

c.

3. The resistance

follows:

6275081

a.

b. 62?5081

inputvoltages

These voltages

1??L316

17?L316 G-14
1?7L316 G-15

output voltages

c-12

device connected.

as follows:

are

177L316 G-12

a-c

17?L316 G'12

a-c

17?L316 G-14

177L316G-15

the

of

c-59

G-61

1830 ohms

=

440 ohms

=

acrossterminals

should

=

terminals

on

undervoltage coils

be as follows:

230

208

or

125 volts,

=

250

volts,

=

110

=

=

=

100

=

volts,

4

and

The

approxi-

volts'

120volts,

50volts,

volts'

I

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d-c

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5

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CHECK

CUIT

CONTINUITY OF BRIDGE

IN

STATIC TIME

ONLY A

VACUUM TUBE

BE ASED.

ETECIRICAT

Figure

components on

open and

The application

run

because the

chanical F

only after the

slightly

mechanical

a

The close

which closes its

solenoid.

allowing

The W

on

automatic

moved

CONIROT COI'IPONENTS

23 shows the connections

electrical.breakers with

the relays de-energized.

G

and

closing

over center. The closing

latch.

signal completes the X

This

the

breaker to

prevents

relay

opening

and then

reapplied.

Fig. 22.

(102C3699)

Wirirg

underooltage deuice used

DO NOT USE

BELL

SET TO

CIR-

DEI.AY BOX;

VOLT-OHM

VOLT

METER

METER

SHOALD

for control

the breaker

of voltage causes the motor to

contacts are

G

switches Erre

spring

contacts,

removes

close.

a

urdess

closed. The me-

arranged to

is

fully

charged and

spring

is held

relay

energizing the

the mechanical

second close

the

close

operation

signal

di,agramfor stati,c time-delay

Thermotector

with

OR

operate

by

circuit,

closing

latch.

is

re-

CC
D

E

F&G

L

@

w

x

X

J-

't-

+

Fig.23.

-

- CLOSING

- ANTI-PUMP

- MECIIANICALLY

-

­.

-

-

- NORMALLY OPENSWITCH

-

(1

cqntrol

CLOSING SOLENOID

AU)CTLIARY

CLOS ING MOTOR

ANTI-PUMP

CONTROL
CONTROL

NORMALLY CLOSED

56A2395)

RELAY CONTACTS

REI.AY CONTACTS

OPERATED

SWITCH CONTACTS

RELAY COIL

RELAY CONTACTS
REI.AY COIL

Electricall5,

diagrant

SWITCHES

CONTACTS

SWITCH CONTACTS

operated wiring

25

GEK-731O,

Power Circuit

Breokers

Replocement

gain

To

ponents,

access

the breaker's

beremoved. Before thisis done,

placed

should

keep it

escutcheon removed. Mounting

the X relay

This mounting

mechanism

screws.

to

side

from

for all

be
from tipping

Figure

24

shows

(2)

and

bracket

side

Removing these

pulled

be

plates.

the left

forward from between the mechanism

The W

side

thedevicesandthe wiringharnessto

frombetweenthe sideframes.
moved, individual

gearmotor

The

three

bolts which fastenit

Removing the motor will also free the

their

springs.

When remounting

springs should

be

the

to

electrical

conhol com-

front escutcheon

asupporting block

under the

forward.
an

the F

frame

relay

frame to

devices can be replaced easily.

is

the

preassembled

breaker front frame to

electrical breaker with

bracket

and G

switches

is

fastened to

two hex-head

by

the

screwsallows

(5)mustalsobeunfastened

allow enough

With the bracket re-

dismounted by

removing the

to the mechanism frame.

gearmotor,

t}te

to the

rrnrst

first

(

1)

supports

(3

and

right-hand

1/4-20

the

bracket

freedom

be taken

pawls

pawls

gearmgtor

the

4).

and

and

unit,

the mechanism

on

The closing

mounting bracket

{rame.

solenoid

disconnect the
c.onnecting
also

The

ing
Before this

must

for

camshaft,

roll

When

gain

the

and

whole assembly

frame.

solenoid

(6)

to the

The most convenient

is to removethe mountingbracket

from the bracket.

the

camshaJt

the

be removed.

ratchet
tfie

out

roll

can

solenoid

armature

on

pinwhich

be done, tlte

be removed and the

described earlier.

"slow-closing"

using

pin

is

vertical

pin

the

enough space

as

the maintenance handle, until

to

begin the driving

is

well started, turn the

for the roll

frame.

Whenreplacingtheratchet, be

with respect

not displaced

and

from its right

shaft

in itstop dead-center

be

the ratchet is

to the

four

at

camshaft

180

degrees.

end,

o'clock.

positionwhen

guided

into

position

is mounted by means

bottom of

way

to the

isremoved

fastens it

gearmotor

closing

pin

to

sure

as it was

Viewing

the

closing

the

breaker

to take

and

The

spring

link must

by driv-

and

arranged

closing

to tlte camshaft.

Tlrrn

operation.

camshaft to

the

clear

it is

breaker

oriented

originally,

the

sprmg

the roller

of

off the

then

pin

pawls

the
the

cam-

should

on

(8041898)

24.

Fig.

26

Electrical

breaker control

1. Mounting

X

2.

Relay

*

^

^

5 . _t DWltCn

4.

Switch

G

5. W

Relay

.l

Bracket

r

6. Solenoid Mounting

7.

Gearrnotor

8. F and

9.

cornporunts

G Switch Operator

Ratchet

Bracket

Power

Circuit

Breokers,

GEK-731O

Adiustment (Fig.25)

proper

For

mechanically

proper

are to

tip

are

duplicate
proper

ratchet

designated

by

in

centers

the

no

but

by the

point

be

of

the

mounted.

operation.

When

usuatly

the

holding

line

with

of the

roller

concern

it

is

important

method

replaced,

electrical

operated

in ttre

switch

a

the

measured

normal

button

When

comes

ratchet

pawl.

an imaginary

camshaft

on the ratchet

if the

action

described.

switches

closing

measure

and

the

dimension.

closing

to

tooth

This

assembly.

stops

positively

to

operation,

must-operate

cycle.

the

distance

the

bracket

new

switch is

operation

a stop

with

No.

1,

tooth

is

passing

line

(2)

and the

on

identify

the

If these

on which

then

an

Fig.

the

one

rivet

It

different

a

F

and

at

switches

between

mounted'.

check

occurs,

arbitrarily

28,

engaged

wtrictr

through

opposite

is

matter

tooth.

tooth

No.

the
the

thev

for

the

is

the

of

been

G

nance
holding pawl.
whenthe

normally

the

while

the

or farther

switches.

will

fasten

i

BErr

its

the

are

are

To

check

the

identified,

handle

switchesoperate

open

G

switch

Electrical

moving

If

this

check

switch

be

needed

the

switches

switchaction,
turn

and

By

F

will

breakers

from

shows

to

be

corrected

away

from

A

very

to

open.

ArARtYl/LocKouT

In

Fig. 26,

components

breaker

shaded

fixed

the

closed.

solidly;

only in

in

the

tfie

camshaft

count

the

using

a continuitytester,

as the

switch

bell

the

should

tooth

that

the

thin

loosen

to

the

alarm

positions

Fixed

center

reset

on the

No. 101o

anadjustment

can

paddle

open-ena

or tighten

bracket.

(FtG.

centers

s which

position.

a-fter tooth

with

teetl

as

raichet

left

will

operate

toottr

be

moved

which

b/g-inch

26)

device

they

in

tne

are cross

No. t

the

they

turns.

close,

the

switches

No. 11.

is

closer

operates

the nuts

is

shown

will

be

mechanism

_hatched

has

mainte_

pass

the

bbserve

The

and

needed,

to

t}le

wrench

which

with

in

with

L

Ratchet

Fig.

la^,

'-.w',

l{ao) tl,/-.'

i\::i/^'

Tooth

No. I

3.

Ratchet

25. (0154C2126)

ratchet

subassembly

,'6ti\-

l\\rti

_-+=- .l
..t

Stop

Roller

Gearmotor,

i

3

2. Carnshaft

pautls,

and

When

tlre

pushes

26,

against

out-link

actionand

act

breaker

-

button

action

links
the

the

(4)

against

from

Resetting

(9)

causes

(6)

and

trip

sha.ft

armature,

away

from

buttons

breaker

into position

normally

ivirgd

in

setting

out

at the

trolled

placed

which

and the

closing

If the

t}te.breaker

If

.If-

shunt

open

parallel

in

t}te

device

is

also

a breaker

device

time

by means

between

it

is

breaker

against

bellalarm

provided,

is

causestfie

the

closing

is

orbyoperatingthe

the

(7)

or the

both

latch

to

trip

accomplished

is

originally,

of

assembly.

fastened.

opens,

the

switchbuttons

endof

trip

shaft

until

done.,either

latching

to

separale.

second

indicated

(6).

link

lockout

motion puts

be

re-engaged

trip

is

alarm

with

to

the

bell

circuit.

consists

equipped

all the

of

shims

the

switch

The

alarm

this

link,

only

adjuslment

tlre

crank

link

pushed'by

is

ttre

adjustment

paddtb

ttre

mechanism

pushing

by

strunt

edges

A

slide

Elrm

(g),

by

This

be used

releases

if

there

tlre

latching

push

switch

auxiliary

of

a bell

by

closing

wittr

a bell

adjustments

Switch

body

operation

of

insulating

and the-bracket

pin

(2)

wti"n

(3).

(b)

teeping

trip

[tZ;.

-tie

of

attachment

on t}te

latch

is

for

resetting,

contact

switch

alarm,

tfie

alarm

screw is

(1),

ctos&

If

a lock_

the

screw

is

reset.

on the

Eithei

two

shunt

link

the

switcir

one.

links

musf

contact

breaker.

Aock_

are

made

is

con-

material

posi-

Fig.

same

to

tlre

trip

latch

on

trip

(?)

The

back

'be

re-

to

a

27

GEK-731O, Power

Circuit Breokers

\-_,'

\

N

1. Crank

Alarrn Link

2.

Pin

3, Switch Buttons

Lockout Link

4.

tioned

tivated

latch

DRAWOUT'VIECHANISfN

The drawoutmechanism

Fig,
front

ports
breaker

As the racking

threaded

screw

that when the

so

position,

in the tripped

27,

It

frame, as shown

(4),

Fig.

frame.

trunnion

threads,

it

position.

is mounted ontle

21,

handle

(1),

rotating thehex shaft,

holds

in Fig.

are

3'tg.

.,.-

-,1

i I

,,*--:7

5.

Fig. 26.

lockout link

the breaker mechanism

AND INTERTOCKS

subassembly

bottom

28.

fastened

is turned,

2?,

moves

(108D8134)

(4)

in

is

is

the breaker

of

Thebearing

to the sides

internally

the

the

on

tlre ends

on

Trip

Shaft

b . .Latcn Llnk

7. Latch Link

B, Unlatching Devices

Bell alarm/Lockout deuice

which

its ac-

shown

sup-

of the

power

of

pins

fixed

The trunnion

(2)

the

on

sleeve, which stops the

in

extreme

other

against
out

assembly

either

length of
threadedshaft,

the

and against

The racking

directionat

fastened the

are

in the

drawout

travels between the

the

end of

point

jamb

nuts when

the sleeve

mechanism

operation

the sleeve,

is

controlledby

10.

Main

Shaft

l l.

Shunt Trip Arrnature

12.

Shunt Trip

arms(5) which

enclosure.

power

the

screw, and

trunnion

its travel.

of

the breaker is fully racked

when fully racked in.

is

adjusted

that the

so

preciselycorrect
which

is free

the amountof

Crank

engage the

jamb

two

the

adjustment

movement at the

trunnion

The

at the factory

action

is

stopped

point.

to

slide

nuts

The

the

on

thread

is

in

28

Power

Circuit Breokers,

GEK-7310

l.

Trunnion

2. Jarnb Nuts

3. Crank

4.

Bearing Supports

Fig. 27

(8041907)

subassembly

5, Arrn

6. Sleeve

7.

Set Screw

8. Racking Screw

Drawout mechanism

engagementbetween the

theadjustment ismade, the

locked

the

lock

this interlock

Fig.

causesthe

it

together

Drawout interlocks require

exception of

shown

by

the

in Fig.

is

6A.

Making

spring to discharge

delays

discharge.

spring discharges

the

of

breaker

ends. It

approximately

the racking-out

This

also

be required as a field
ponent

has

part,

is correct

2 turns

cycle.

is

afactoryadjustment,

been damaged and requires replacement.

sleeve and

set screw

closing spring discharge

6A.

The

shown

as

the

link

The setting is made so

the

after

but before the racking

discharge

i-t

of

operation

AKRU.sO FUSED

With the

fuses on
device, AKRU-5O breakers
the

same as

exception of

the upper

general purpose

having integrally

studs and an open fuse lockout

its

collar.

sleeve and itscollax

(7).

no adjustments, with

crank which operates

(3)

in

(B),

earlier.

secondary disconnects

27

Fig.

and

Fig. 6A, shorter

Lengthening

place

takes

the racking handle

and should

unless

some com-

BREAKER

mounted

inallother

are

AKR-50

respects

breakers.

After

inter-

(2)

that

action

left in

axe

in

the

with

not

Fig. 28.

(8041842)

breaker

View

from

front Jrame)

belant

(bottom

of

Fuses which

tabulated

No.

Cat.

800

F 8B

GF

100

F 98

GF

GF
GF
GF
GF

*

FUSE REPTACEMENT

8B

F

88 160

F

88

F

9B

F

No

Class

120
200

250

NEMA

L

as shown

only one mounting

two holes. Holesare intendedfor usewith 1/2-inch

may be

in Table

cl.

800A-600v

L

1000A-600v

L

1200A-600v

L

1600A-600v

L

2000A-600v

L

2500A-600v

class.

type fuses

in Fig. 30. Fuses rated

hole ineach

bolts. Removing

supports, which

frees tlte

been replaced, the

fuse for replacement. After

lockout must be

reclosed.

be

have

pushed

used

on these breakers are

3,

IABI.E

Rating

Special.

3

Outline

846C0826-1
846C0826-2
846C0826-3
846C0826-4
846C0826-5

246A6547

mounted on the breaker

are

800

tang. All

the

bolts from tfie

internally threaded inserts,

reset button

in

before the breaher can

on

copper

the

Melting

Time

Current

Curves

cES-8005

GES-8005

cEs-8005

GES-8005

cEs-8005

1838?832

amps

others

fuse

a

open

have
have

fuse

has

fuse

29

GEK-731O,

Power Circuit Breokers

1.

Special
Disconnect

z.

?

Heat Sink

Fig.

A

AKRU-50 breakers. See

developed

which

amp

shown

is a more

follows:

2500A Fuse

Key

(5041902)

29.

speci.al 2500A

special

would coordinateparticularly

2500-amp

provide

to

trip devices.

29

Figs.

in

involved operation.

AKRU-T)

fuse

melting time characteristic

a

The mounting

31.

and

4.

Upper Barrier

Prirnary

5.

Breakerwith

fuse

has

been

29.

Fig.

This fuse was

well with

for

Replacement

The

procedure

Disconnect

provided

1600-

this fuse

this fuse

of

for

for

1.

ing the

these

may be removed

tang. This

disconnect.

2.

3.

inner

short

4.

5.

sembly

the fuse

requi.res replacement, note tlzat this

is

rear.

about its

is

wi.th respect

it

screw

the two

and

Remove

have been tal<en out,

pulling

pulling

by

keys

will not disturb the force setting of

upper barrier

Remove

Remove

end of

extension will be required.

Remove

Instail

procedure.

NOTE:

mounted differently.

right when

the

fuse

stud.

difference does not

primary

the

the

the two t/2 inch-L3 bolts from

the fuse.

heat

the

new fuse

heat sink are clean.

and

If the

uiewing

this

On

axis 180 degrees and tlze

A ratchet

(3).

sink

by reversing the disas-

Make

sure

i.n the left breaker

fuse

the breaker

phase,

is mou.nted beneath

The

tangs

dis

to

conne

these

of

another so that

one

affect the

ct.

(2),

Fig.

29,

by remov-

the key upward.

the

disconnect device

it off t}te end of

(4).

and socket

the fuse

the mating faces

pole

This

the

pole

fuse

the breaker

fuses

fu.se

is on the

the

frotn

is rotated

tang

are

offset

Utis

positiott

When

with

o_f

of

the

the

a

of

(22748298)

30.

30

Mounting

for

Class

"L"

fuse

l. Breaker Stud
Fig. 31.

(134C2183)

tuIottnting

for

Z.

Heat

special

Sink

fuseFig.

Power

Circuil

Breokers,

GEK-731O

oPEN FUSE

This device

TOCKOUT

automatically trips the fuse breaker

DEVICE

if one of the fuses opens. When

breaker

32,

should

fuse

solenoid

solenoid
can be checked

its closed

place

is

lockedopenuntilthe resetbutton

phase

the

of.

not

be reclosed, of course,

is

replaced.

tripping

The

will cause

armature closes

position

at

least

involved is

(5)

rod

should

the breaker

against its magnet. This

by moving each

and noting that

1/32-inch before

pushed.

travel ends.

"ry

(FlG.

32)

this happens, the

(1),

The breaker

until the

opened

be set so that

to trip before the

armature towards

tripping takes

Fig.

any

POWER SENSOR

OVERCURRENT

NOTE: Detailed.

POWER

the

contained

are

Instructi.ons

TestKits

in

bubli.cation

The POWER

acting,

prises

four

PST-Iand

self-powered

(4)

major components

DEVICE

TRIP

serai.ci.ng

SENSOR

publi'cati,on

in

use of the

on

EK

G

-73

SENSOR

PST-1-1

procedures

tri'p deui'ce

POWER

01.

is a solid-state,

trip device system. It

).t

PSL-A-I

GEK-7309.

S,ENSOR

prouided

are

(Fig.

33):

il

for

direct-

com-

Fig.

(108D8133)

32.

7---1,

'-*-----lF.

lir"

'-----ii/

._____-l!

____4|_l

, 1iril

l ll

I .

Reset Button

2. Arrnature

3.

Solenoid

4.

Trip Paddle

5.

Tripping Rod

i I

z

Open

lockout deui.ce

fuse

31

GEK-731O,

Power

Circuit Breokers

1. The

breaker

2. The Power

Current Sensor

conductors.

Supply

tripping energy and the

current

settings and time-delay

trips

ground

32

detection.

3. The

4.

Logic Unit

The Magnetic

the breaker.

In addition to

fault

sensing function

Trip Device

Also

phase

1.

Magnetic

Device

2. Stud

3. Current

Fig.

33.

(3),

Fig. 33, around

(7)which

comparison basis for over-

(6)

with the

selection taps.

(1)whichphysically

see Fig.

overcurrent

may

Trip

Connector

Sensors

(8041965)

provides

various

38.

protection,

provided.

be

AKR-50

both

pick-up

the

the

a

+.

r

ap ,Hlate

5. Sensor

Logic Unit

6.

Power

7.

POWER

The

that the

conductors

systems)

Therefore, if

wye

former,

included

combined with the secondaries of the

sensors mounted on

Taps

Supply Unit

S,ENSOR

Ground

instantaneous values ofcurrent in the three

add

system with

the fourth sensing coil

on

components

Fault function operates

(or

in four conductors on four-wire

to zero unless

the

electrical system is a four-wire

the neutral

ground

grounded

on

current exists.

(Fig.

theneutral

conductorwith its secondary

the breaker.

breakers, the output of the external neutral

connects to t}te

which is

Refer

mounted low on

to

Fig. 35 for cabling diagram.

breaker by a control disconnect

the

back of the breaker.

principle

the

at the trans-

34) must be

three-phase

draw-out

On

sensor

Power

Circuit

Breokers, GEK-731O

BE REMOVED TO

NATE THE

COMPLETELY

POSSIBILITY OF THE

BREAKER TRIPPING. DO

BREAKER WITH POWER

CONTACTS

WHILE THE DISCONI,{ECT

PLUG TO THE MAGNETIC

DISCONNECTED.

1.

Check

ground

breaker to trip
normal

2.

The

mechanical

by

inadvertent

tively

SENSOR.

shouldbe obtainedbefore

SENSOR trouble

BAoK FRAME i

MAGNETIO

LEFT I

PoLE

for the

fault

conditions that may

as a

existence

proper

circuit conditions.

possibility

shunt

eliminated

Successful operations

SENSORS

r^

|

of

interferences

trip

before investigating

shooting.

I

the

operations

proceeding

NOT CLOSE

THE MAIN

ON

COILS

of overcurrent

be

response to

breaker

along the trip

being trip

should be

in the test

with the

ELIMI-

15

causing the

these

ab-

free

shaJt or

posi-

the

POWER

position

POWER

or

1. Terrninal

External Ground

2.

(8039650)

34.

Fig.

When

Trip

one or

that

following steps should

functioning

malfunctioning of

is indicated, the

more of

component

WARNING:

TAPS CONTROLLING

/NG

BREAKER

CAUTION:

SENSOR

OPERATIVE

TO CONTINUE

(Remotely Iocated)

trouble

these four components

should

be replaced as

be

unit:

ADJUSTMENT

NO

SHOULD

BE MADE

CARRYING CURRENT.

IN THE

EVENT THE POWER

DEVICE MUST

TO ALLOW THE BREAKER

CARRYING

WITHOUT OVERCURRENT

TION, IT IS RECOMMENDED

LEADS TO THE

TRIPPING SOLENOID

Sensor

Ground

Coil

sensor

coil

the POWER SENSOR

traced

should

be

involved

unit.

a

taken to detect

TO THE

TIM.

PICK-UP

BE MADE NON-

OR

WITH

THE

CURRENT

PROTEC.

THAT THE

a

to

and

The

mal-

'FllE'

iro'|T

FoLt

,'l

,- |

,v

I

Fig.

(1s3c901s) POWER

35.

cabling

diagrant

_l_____{i-lo^v:(-?

to

soR

AflODE

lr

tl

ll

il

<t­<t-

RI

L-------- J

SENSOR

33

GEK-731O,

Power

Circuif Breokers

3. A PST-1

available.
correct

point

for

Supply
struction manual

and

test

percent

function

on each time-delay

correct operation

Unit. This

GEK-7309

results forthis

from

If the deviation

factory

for

4. If the breaker

protection,

the

result of falsely answering

ground

or a

by temporarilyeliminating

shorting out the

ground

signal

tomof thebreaker.

tified by the

(See

them

service and

POWER

(See

Fig. 36.

for each

GEK-7301for

POWER

published

is more than10

possible

determine

trip

signal.

ground

terminal

0.15UF

Fig. 37).

the

with

characteristic.

of each

procedure

testdo not

curves,

replacement

is equipped

whether

signal

board

Terminals

capacitor connected between

With the breaker restored

ground

establish whether there

overcurrent.

SENSOR Test Kit must

Check

)

SENSOR instructions.

the

pick-up

Logic

setting

phase

is

the

deviatemore than

proceed

percent,

of

with

the

an

Then check

of the Power

described in in-

PST-1

the

Logic

ground

false tripping

overcurrent trip

Unit
and one

Test Kit

to

Step

contact the

Unit.

fault

This may be determined

theground

points

on the back frame

fault

is false tripping

trip

signal by

1 and 5

5

1 and

can be iden-

thus de-activated,

at

bot-

due to

be

for

If

10

4.

is

the

to

FATSE

FAUTTY

(fourth

the shielding be effective by having

the

CT

conductors.

exists

these

check

are located

R

either terminal

the shield iscontinuousfrom
mote

A.

continuous and
Check

of

after shield

TRIPPING

GROUND

the

ff

breaker

CT

disconnect

and that this

through the

conditions

1.

Remove

continuity between A and

2.

Check

and

A or between

CAUSED BY

FAUTT

OPERATION

is equipped

remotely

It

on end of

to be sure no continuity exists between

mounted),

plug

atthe

Logic

shield be isolated from the

is also important that

ground

as follows, referring

connection

plug.

and

R

3. Temporarily connect

remote

at

by checking for continuity between

CT

If continuity does not now

point

of discontinuity must be found.

the

control

discontinuity.

disconnect as

Remove

continuity is established.

for four-wire

it is important that

Unit

signal

plug

at

C

C.

jumper

and

CT

Logic Unit

exist,

the

jumper

service

continuity from

to the

circuit.

external

signal

continuity

Check

to Fig.

Logic

(Sienal).

Unit

Letters

from shield to

check

to

assure

Plug to re-

R

shield

possible point

is not

at remote

37.

and

and

CT

h*_

:l

sry

ii

iB

i{

il

'f"s"

Fig. 36.

trcr

is

&

irI

(80s9962)

-

,t{

-

{b

POWER S,ENSOR

test kit

Note the

Be sure the external

polarity

marks on

ground

current associated with the
current

with Fig.

to the

polarity

IESIING CURRENI

and that

37. If

source, the external

mark toward the

After the PST-1

mine theadequacy

may

it

netic

be advisable, or

coils by the use of a hi-cument,

test set.

need be

up setting
published

the

phase

minal
overcurrent test.

REPLACE'NENT

rear of thebreaker.

from the rear after

tap
power
phase

made, at some convenient multiple

time- current

breakers equippedwith

For

ground

testing unless

board

Current

plate

boards,

supply unit and the

studs. These

polarity

the breaker

SENSORS

Test Kithas beenused

of

this

In

such as 300

sensor
jumper

event, only one test

will cause

points

sensors

unfastening the

the disconnect

marks are

source.

performance

required, to test the mag-

percent

curves.

the signal is shorted at

can

The sensorstuds

copper

components are displayed

Fig. 33.

ground

the

senses

CT

particular

the

breaker load

in accordance

bottom studs connect

must also have its

CT

of the

Logic Unit,

Iow-voltage

per phase

for

comparison with

ground

1

and

be

dismounted from

f ault function,

tripping

5

plug

connectors to the

on single-

(Fig.

3?) during

are removed

hardware, the

to

the

sensors.

neutral

to

deter-

pick-

of

ter-

the

static

in

34

Power Circuil

Breokers,

GEK-731O

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Ground

fault

wiring

di,agram

35

GEK-731O,

Power Circuil Breokers

tr.1

ii

I.z.Adjusting

Adjusting Screw
Breaker

Screw

Front

Frarne

Fig. 38.

TVIAGNETTC TR|P

DEVTCE

This device may be dismounted by removing

hardware which f

The

support

nuts in the

of

replaced by

th:e front

coil and

,

'ing
controls

sion

(2).

fasten the device to
loosened.

of

magnet

Adjustments

screws

t}te

"8".

Dimension

Before this

astens

bracket

assembly.

removing

the

support bracket. This will free the

zubassembly.

are

shown

gap

open

This

should be

"A"

can be

Dimension

(F|GS.

it

to

the

33 AND 38)

breaker

front frame.

is tapped, eliminating the

The

device coil

the two No.

made

by means

in Fig.

the

of

is

controlled

changed, the

the breaker

shouldbe

"A"

38.

device armature,

set at

10-32

the two

of

Adjusting

t/4

inch,

by adjusting screw

screws

frame must be

setat

(22748291)

the

use

may

be

screws

screw

5/32

in

adjust-

(1)

dimen-

which

irch.

Magrrctic

on

current

the

before

the higher

the
the

part

,nearest

ment
the
mum
Ioads

breaker rating

cycles while

removed instantaneously.

trip deuice

the

basis

pickup.

shorter

the

breaker having the

of

time

a

This will

setting and

current

part

of tlte line

lower

setting.

of the electrical

the fault

To reduce the

andto

overloadcaused

amount

producing

will

possibility

provide

time

of

current up

are removed in

currents in excess

progressive

pickup,

protected

Hence,

maximum

allow the breaker having

the

longer time

provided

by the

if

a fault occurs in

system, only

trip.

of damaging the equip-

saJety to the

by

fault isremoved

a

by

selective

to five

series of

pickup

lower

setting and

the

fault is

breaker

the

in

tripping.

ten times

or

matter

a

of this value

time

and

to trip

on

having

any

breaker

operator,

mini-

a

Over-

the

of a few

are

SETECTIVE TRIPPING

Selective

in

the electrical distribution

36

tripping is

obtained when

system are

the

brealers

arranged

For t}te exact

breaker in

made

to

the

particular

characteristics

a

selective system, reference

coordination

system.

andsetting

chart furnished

of each

should

for the

be

Power Circuit

qla

st

!t

F++-q

IT

T
T
,a

;

ta
5

}IUITIPI.ES

OF

r

Breokers, GEK-731O

TRANSFORiIER TAP

n

ta

I
T

aa

I

8.

uo

U

-r

t

I

la

IT

T

aa

tt
t

rt

t
I
tl

I
I

..

I

ta

I
I
t

a

!

a

t

t
t

.t

.l

t

.a

.t

.t

.t
.t

.n

n
a

Fig. 39.

(109HL687)

current

,IIUTTIPLES

OF TTANSFIOIMET

Long-time-delay, Short-time-delay

curaes

Power Sensor solid-state trip deuice

for

TAP

instantaneous time

and

,I

ir

it

3?

GEK-731O,

00f

|

e00

t00

r00

tm

5m

400

tm

100

l0

l0

70

l0

ot0

z

Qa

t0

2

;

5ro

Power

Circuit

Breokers

to0
t00

700

t00

!6

100

300

100

t0

t0

10

.0
!0

1l

il

.t

.01
.01
.07

.0t

.05

,04

.03

CURRENT

Fig.

(109HL689)

40.

curues

38

IN IAUI.TIP!ES

Gt

otacd

Power

fot,

OF

fault

Sensor

I

GNOUNO.TRIP

SEITING

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