Answer / raj

relay are device which are use to sense fault .
and cntactor are device which reacived signal through relay
and remove contact from the line or connect the line
(manually)

Answer / sahilnabi

Relay is basically an electronic device which manufact because of sensing very small parameters of electricity.

In connectivity of the same contactor is made for basically for manual as well as automatic switching operation for secure the machine from several surges.

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