Rockwell Automation 140U Q and M-Frame Circuit Breakers Instruction Leaflet for Shunt Trip - Manual

A
WARNING
CONTACT WITH ENERGIZED EQUIPMENT CAN
RESULT IN DEATH, SEVERE PERSONAL INJURY, OR
SUBSTANTIAL PROPERTY DAMAGE. DO NOT
ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT
IS
ENERGIZED. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING WITH THE TASK,
AND ALWAYS FOLLOW GENERALLY ACCEPTED
SAFETY PROCEDURES.
ALLEN-BRADLEY IS NOT LIABLE FOR THE
MISAPPLICATION OR MISINSTALLATION OF ITS
PRODUCTS.
The user is cautioned to observe all recommendations,
warnings, and cautions relating
to the safety of personnel
and equipment as well as all general and local health and
safety laws, codes, and procedures.
The recommendations and information contained herein
are based on Allen-Bradley experience and judgement,
but should not be considered to be or cover-
ing every application or circumstance which may arise. If
any questions arise, contact Allen-Bradley for further
information or instructions.
1. INTRODUCTION
Fig. 1-1 Shunt Installed in Q-Frame Circuit Breaker
GENERAL INFORMATION
The shunt trip (Fig. 1-1) provides remote controlled elec-
trical tripping for the circuit breaker.
It consists of an inter-
mittent rated solenoid with a tripping plunger and a cutoff
switch attached to a plug-in module. The plug-in module
is mounted in
slots in the top of the trip unit and occupies
the accessory cavity in the circuit breaker frame. When
the solenoid is energized, the plunger extends and
presses against an intermediate plunger which operates
the trip bar in the trip unit. As the circuit breaker trips, the
molded crossbar presses against the cutoff switch oper-
ating arm to open the cutoff switch, disconnecting power
to the solenoid and preventing coil burn out.
40752-075(1) Effective 4/02
Q and M-Frame Circuit Breakers
Instruction Leaflet for Shunt Trip
Bul. 140U