Instruction Book
Effective: May 2006
I.B. 2C12060H08
For more information visit: www.EatonElectrical.com
Page 68
Table 7.1 Circuit Breaker Troubleshooting Guide (continued from previous page)
Symptom Probable Cause Corrective Actions
Circuit breaker cannot Shunt trip control signal Check supply voltage exceeds
be opened remotely, but absent or too low 70% of rated voltage when
can be opened locally signal is applied to shunt trip
Shunt trip is faulty or Remove front cover; check
improperly installed voltage supplied to shunt
trip; make sure shunt trip is
seated and retainer snapped
into place. Check for shunt
trip motion; replace shunt
trip if faulty
Secondary contact wiring Make sure electrical pin and
problem socket connectors are properly
seated in molded plug. Verify
proper wiring
Circuit breaker cannot OPEN pushbutton locked Remove lock
be opened locally
Faulty mechanism or main Contact Cutler-Hammer
contacts welded service center
Circuit breaker makes Closing spring not fully Charge spring manually; check
no attempt to close with charged (check SPRING voltage to electrical operator;
either local (manual) or CHARGED indicator) replace electrical operator if
remote controls; springs faulty
do not discharge
If equipped with undervoltage Unplug undervoltage release
release, undervoltage release from mounting deck and retry
is not energized or is faulty closing operation; if OK, check
voltage supply to undervoltage
release (>85%); replace under-
voltage release if faulty
Circuit breaker locked in Check reason for lock
OPEN position
Drawout position interlock Make sure that circuit breaker is
is operating; levering screw at a position that permits closure;
door is open check that shutter
(door) over the levering screw
is fully closed
Circuit breaker interlocked Check for presence of an
with another circuit breaker interlocking scheme (cable
or device interlock or key interlock);
check to see if interlocked
circuit breaker is CLOSED
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