Answer / pradhyumn

relays are devices that detects the fault and initiates the
operation of the circuit breaker to isolate the defective
elment from the rest of the system.(V.K. Mehta)

Answer / syed

it need relay otherwise it will not work at all

Answer / avd

It depends on circuit breaker. If sensing eliment is
installed inside the CB or outside the CB. Like MCCB with
maganetic trip latch will operate. Same way MCB will also
operate as it has short ckt and O/L sensing eliment. But
large circuit breakers have relays outside.

Answer / deepak yadav

yes, relay is used in circuit breaker for automatic opration. without relay it is oprated manually

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