If the circuit breaker will not close or it will trip, what will you do?

If the circuit breaker will not close or it will trip, what
will you do?

Question Posted / ilong

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If the circuit breaker will not close or it will trip, what will you do?..

Answer / k.prakashchandra

Check the DC supply first

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If the circuit breaker will not close or it will trip, what will you do?..

Answer / asif khan

I can follow below trouble shooting steps,

check the error code to see if there was any short ckt or
earth fault, if there was (check for cable termination if
the connections are not burnt out due to short circuit,
check earth resistance and current voltage etc. of the
terminals) eliminate the fault then it should work fine.
Check the control wiring of the breaker check the fuses,
contactor operations etc.

check the under voltage release to see if it did not trip
due to under voltage or over voltage. check shunt trip
mechanism.
check if breaker is not overheated as a breaker may not
close if magneto thermal release is tripped.

check closing coil operation and see whether breaker gets
charged automatically with help of the motor.

if none of the above problem found, Rack out the
breaker(keep it in isolated position)trip the breaker
manually a few times and try closing it again should work fine.

In case it does not happen you can try and by pass the
breaker with help of crocodile pin Jumpers ( In case of
Emergency), but one need to be extremely careful and should
ensure that the incomer supply to breaker is turned off
while doing it, as a high risk is involved. Also you should
be confident that breaker did not trip due to an abnormal
condition.

Note: Some breakers indicate nuisance fault as well

Further,