Instruction Book
Page 67
Effective: May 2006
I.B. 2C12060H08
For more information visit: www.EatonElectrical.com
SECTION 7: TROUBLESHOOTING
7-1 INTRODUCTION
Table 7.1 will help to determine the probable causes of
simple circuit breaker problems and possible corrective
actions. Possible problems associated with the elec-
tronic trip unit are covered in companion publications,
I.L. 70C1037H04 and I.L. 70C1036H05. If the problem
cannot be resolved with the aid of one or both of these
guides, contact the Cutler-Hammer service center for
more in-depth assistance.
Table 7.1 Circuit Breaker Troubleshooting Guide (continued on next page)
The circuit breaker trips open Rating plug not installed Install rating plug that
(red fault trip indicator button and load current through corresponds to current sensors
is out and/or fault indicator LED the breaker
is lighted) when closed on a
load current Repeated closing on Wait for circuit breaker (and
transient (in-rush) current loads) to cool before re-closing
with thermal memory active
An overload or fault current Use status and fault
condition indicators to help locate and
remove overload or fault
condition
Circuit breaker opens Undervoltage release Check and correct the UVR
(fault trip indicator button operates; voltage too low supply voltage (85-110% rated
is not out) or zero voltage)
Shunt trip operates Check control signal(s) to
shunt trip; correct if necessary
Trip latch is defective Inspect latch condition and
engagement before closing;
consult Cutler-Hammer service
center
Symptom Probable Cause Corrective Actions
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