Allen-Bradley J-Frame CB Thermal Magnetic Breakers and Motor Circuit Protectors Installation Instructions

Allen-Bradley J-Frame CB Thermal Magnetic Breakers and Motor Circuit Protectors are designed to provide reliable overcurrent protection for a variety of electrical circuits. These breakers feature a combination of thermal and magnetic trip elements, offering protection against both overload and short-circuit conditions. The J-Frame CB series is available in single-pole, double-pole, and three-pole configurations with a wide range of amperage ratings. They are commonly used in industrial, commercial, and residential applications.

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Bul. 140U
J-Frame Circuit Breaker
Instruction Leaflet for Thermal Magnetic Breakers and Motor Circuit Protectors
W
arning
Warning
1
O FF
DO NOT ATTEMPT T
O INST
ALL OR
TO
INSTALL
PERFORM MAINTENANCE ON
EQUIPMENT WHILE IT IS ENERGIZED. DEA
TH OR SEVERE PERDEATH
SONAL INJUR
Y CAN RESUL
T FROM
INJURY
RESULT
CONT
ACT WITH ENERGIZED EQUIPCONTACT
MENT
WAYS VERIFY THA
T NO
MENT.. AL
ALW
THAT
VOL
TAGE IS PRESENT BEFORE
VOLT
PROCEEDING.
2
Line
Line
0.625 (15.9)
1.25 (31.8m m )
R 0.188
(4.8m m )
0.281
(7.1m m )
2.047
(52m m )
CL Breaker H andle
1.016
(25.8m m )
0.5 (12.7m m )
4
(101.6mm )
(3 Pole)
CL
Breaker H andle
Load
40752-021(1)Effective 3/02
5.375 (136.5m m )
(4 Pole)
2.078
(52.8m m )
2.00
(50.8m m )
Load
Mounting
3
Operation
5
ON
TR IP
10 in -lb
(0.2 N ⋅m )
OFF
RESET
PUSH
TO TR IP
Connections
4
Trip Unit
6
Motor Circuit Protection
M agnetic A djustm ent
Line Protection
See Table
M ag n etic
A djus t
T he rm a l
A djus t
Endcap
4 P 3 d (0 % )
N e u tra l P o le
A d ju st
Terminal
Catalog
Wire Size Range
mm2
Number
AWG
140U-J-TLS *
4-350
140U-J-TLA
4-350
Torque
Wire
N-m
Type
Material
25-185
180
20
Cu
STAINLESS STEEL
25-185
250
28
Cu/Al
ALUMINUM
40752-021(1) Effective 3/02
M ag n e tic
A d ju st
Terminal Body
in.-lb
* Standard collars mounted on line and load end
4 P 4 d (1 0 0 % )
or
4 P 4 d n/2 (6 0% )
Molded Case Switch (Isolation)
T he rm a l
A d ju st
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Key features

Thermal-magnetic protection
Adjustable trip settings
Wide amperage ratings
Single/multi-pole options
Compact design
Easy installation
Durable construction
UL Listed
CSA Certified

Frequently asked questions

Thermal tripping protects against overloads (excessive current over a longer period) while magnetic tripping protects against short circuits (sudden high current spikes).

Refer to the "Operation" section in the viewed document for detailed instructions on adjusting the trip settings. The specific adjustment method depends on the type of breaker.

The maximum wire size will vary depending on the specific model of the breaker. Refer to the "Connections" section in the viewed document for detailed information on wire size ranges and torque specifications.