Page 1
Packaged Items/Assembly Tools
Operating Instructions
Fitting Internal Accessories
Breaker
Instr
uct
ion
1
233P:
4P:
Instruction Manual
(This document)
Interpole Barrier
(Only FC)
17
65
RESET
TRIPPED
YBAL
Alarm Switch
YBAUX1
Auxiliary Switch
YBST** YBUVR**
Shunt Trip Undervoltage Trip
Ring Mark
10 mm
Auxiliary Switch Alarm Switch
a contact b contact
a contact
b contact
11/AXc-14/AXa 11/AXc-12/AXb
91 /ALc -
21/AXc-24/AXa 21/AXc-22/AXb
31/AXc-34/AXa 31/AXc-32/AXb
41/AXc-44/AXa 41/AXc-42/AXb
Shunt Trip
power source
C1-C2
Undervoltage Trip
power source
D1-D2
94 /ALa
91 /ALc 92 /ALb
Symbols of Accessories
Symbols of Accessories
Dummy unit
After fitting, verify the function of the Accessory.
ON
Handle
OFF
Trip Button
AX
AL
SH
UV
V
Form the cable
Pull Out Leads on Load Side
Combination
Removal
In case of fiting one (or two) auxiliary switch,
fit in an order from a left side-slot.
3 pole
4 pole
Please retain this manual for future reference.The Manufacturer assumes no
responsibility for damages resulting from non-application or incorrect application of the
instructions provided herein.
Operation effortOperation
(OFF) (ON)
53N
(ON) (OFF)
57N
TRIP (OFF)
91N
Connections/Poles
YB3
Front
Connection
M4 55
3P
2
4P
4
M8 18
6
8
Qty Mounting screw Qty
Type
Connecting screw
3P
4P
Rear
Connection
M4 55 M8 25
3P
2
3P
6
4P
4
4P
8
Plug-in
Connection
M4 65
M83P
2
3P
6
4P
4
4P
8
DORMAN
SMITH
A49914
LOADLINE YB3 FRAME
Instruction Manual for
Moulded Case Circuit
Breakers
Fixed Type
YB3***TF
Adjustable Thermal Magnetic Type
YB3***T
Dorman Smith Switchgear Limited
8 Swinbourne Drive
Springwood Industrial Estate
Braintree Essex
CM7 2YG UK
Tel: +44 (0) 844 225 1063
Fax: +44 (0) 844 225 1064
Safety Notices
Be sure to read these instructions and other documents accompanying this
product. Please familiarise yourself with handling of this product, safety
information, and all other precautions before mounting, using, servicing or
inspection. In these instructions, safety notices are divided into "Warning"
and "Caution" according to the hazard level.
WARNING
A warning notice with this symbol indicates that
neglecting the suggested procedure or practice could result in lethal or
serious personal injury.
CAUTION
A caution notice with this symbol indicates that
neglecting the suggested procedure or practice could result in moderate
or slight personal injury and/or property damage.
Note that failing to observe
CAUTION
notices could result in serious
results in some cases. Because safety notices contain important information,
be sure to read and observe them.
Mounting Precautions
For detailed mounting dimensions, refer to either the Loadline or
System Loadbank catalogues.
CAUTION
Electrical work should only be undertaken by suitably qualified
persons.
Do not place the product an an area that is subject to high temperature,
high humidity, excessive dust air, corrosive gas, strong vibration and
shock, or other unusual conditions. Mounting in such areas could cause
a fire or malfunction.
Be careful to prevent foreign objects (debris, concrete, iron powder etc)
and rainwater from entering product. These materials inside the product
could cause a fire or malfunction.
Prior to commencing any work on the product, open an upstream circuit
breaker or isolator to ensure that no voltage is applied to the product
otherwise electrical shock may result.
For 4 pole breakers, be sure to connect a neutral conductor to the
N-phase pole, otherwise an overcurrent may hinder the product from
tripping thus resulting in a fire.
When connecting cable or busbar to the product, tighten terminal screws
to the torque specified in this manual,
otherwise, a fire could result.
After conductor connection, do not
apply excessive force to the terminals.
Otherwise, a fire may result.
For front-connected breakers, insulate all bare conductors of the line side
until the breaker end. If interpole barriers are packed, be sure to use the
barriers; moreover, insulate all bare conductors by insulting tape or the
like so that the tape overlaps with the barriers. Insufficient insulation may
result in short-circuit.
Do not block the arc gas vents of the product to ensure adequate arc space.
Blocking these vents could result in failure of circuit interruption.
Handling Precautions
WARNING
Never touch terminals. Otherwise, electric shock may result
CAUTION
When the breaker trips open automatically, remove the cause, then
return the handle to the ON position. Should a fault be interrupted,
the breaker must be inspected, otherwise, a fire may result.
Maintenance Precautions
CAUTION
Service and/or inspection of the product must be done by persons
having expert knowledge.
Before servicing or inspecting the product, open an upstream circuit
breaker or the like to isolate all sources of power. Otherwise, electric
shock may result.
Regularly check that the breaker terminal screws are tightened to
torque values shown within this manual, failure to do so may result
in fire.
Other Precautions
Do not carry this product by accessory leads, as this may cause damage
to the product.
Unauthorised opening of the breaker cover will invalidate product warranty.
When installing the product, use wires or conductors, the cross sectional
areas of which accommodate the rated current of the product. Using wires
or conductors with inadequate cross sectional areas may cause false
tripping and overheat.
Page 2
Breaker Mounting
Conductor Connection Procedure for RC/F.P (where applicable)
Procedure for FC / RC
Interpole Barrier Terminal Cover Mounting Procedure
Time/Current Characteristic Curves
Mounting Procedure
M4 55 mm
1.3 1.7N m
Adjustable Thermal Magnetic Type
Conductor Connection Procedure for FC
OFF
11
9
5
7
0.63
0.8
1
l
i
(
x
l
n
)
l
R
(
x
l
n
)
Insulate all bare conductors of the line side until the breaker end.
When removing, remove the items in
reverse order of mounting.
When removing, remove the items in
reverse order of mounting.
0.63 0.8 1
11975
I
T
/R Adjustment Range
/
i Adjustment Range
I
n
x
I
n
0.63 0.8 1
1086 13
I
T
/RAdjustment Range
/iAdjustment Range
I
n
x
I
n
( =100, 125, 160, 200A)
I
n
( =250A)
I
n
L
L
M
13
N
Solderless Terminals Mounting Procedure for FC
A
J
C
22mm
D
11mm
E
8.4mm
F
25mm
G
11mm
H
7mm
I
9mm
L
M6 18 mm
11.8 18.6N m
7.8 11.8N m
M
9mm
N
M8 25 mm
Flat Bar Stud
YB3RT*P
M8 18
7.8 12.7N m
M10 25
22.5 37.2N m
K
J
J
K
6
17
Flat Bar
YB3XT*P
YB3XTS*P
Interpole Barrier
YB3TB
Terminal Cover Lock
Rear/Plug-in Connected
(RC / PM)
Connection
Front Connected
(FC)
YB3TS*P
Terminal Cover
YB3TC*P
YB3TS*PS
End cap
Solderless Terminal
YB3CC*P
P
120mm
2
Q
19N m
R
M6 20mm
6.9 9.3N m
R2
T2FW25LS
O
23mm
10
6
Handle Lock Mounting Procedure
Handle Lock
YBDL1
Handle lock can be fitted in any position of I (ON) and O (OFF).
When removing, remove the items in reverse order of mounting.
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