Answer Posted / sanket patil

A TNC SWITCH IS ALSO CALLED BREAKER CONTROL SWITCH. IT IS
LOCKABLE IN THE NEUTRAL POSITION AND IS A THREE POLE SWITCH.
WHEN IT IS IN CLOSE POSITION THE COMMAND IS GIVEN TO THE
CLOSING COIL OF THE CKT BREAKER AND THE BREAKER CLOSES.
WHEN IT IS IN THE TRIP POS COMMAND IS GIVEN TO THE TRIP
COIL OF THE CKT BREAKER AND THE BREAKER TRIPS.

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