Answer / jithendra

circuit breakers works mainly for protection of circuit
so it needed to trip when fault occurs

inside the breakers current transformers (CT's) are placed for sensing the fault

Breaker are operated with closing,triping,shunttrip & Under&over voltage coils

Through ct's fault will sense then pulse will be given to
the triping coil at that time breaker will trip

Breaker will have these faults protections

OVER LOAD
EARTH FAULT
INSTANTANEOUS CURRENT
SHORT CIRCUIT CURRENT

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