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 (f) A manually operated control disconnect device is provided with all circuit breakers.
When opened, this device will prevent the electrical closing of the circuit breaker; both remotely
and locally.
3.5.7.6 Malfunction. There are many things that can be the cause of a circuit breaker not
performing correctly. Problems that can be corrected by the operator are indicated in Table 3-1
(Troubleshooting Chart for Circuit Breaker Operation). The maintenance crew is, however,
responsible to remedy many circuit breaker malfunctions.
TABLE 3-1
TROUBLESHOOTING CHART FOR CIRCUIT BREAKER OPERATION
Trouble
Probable Cause
Course of Action
o Mechanism binding or
Failure to trip.
sticking - caused by:
Lack of lubrication.
Lubricate mechanism.
Mechanism out of
Adjust all mechanical
adjustment.
devices, such as
toggles, stops,
buffers, opening
springs, etc.,
according to
instruction book.
o Failure of latching
Examine surface of
latch.
device. If worn or
corroded, it should
be replaced.
Check latch "wipe",
and adjust according
to instruction book.
3-38
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