what is the function of NAT & NAC contacts in breaker
control switch (TNC)??






what is the function of NAT & NAC contacts in breaker control switch (TNC)??..

Answer / k.prakashchandra

NAT- normal after trip and NAC normal after close.These are
'lost motion contacts' which indicate last operated position
of breaker .With NAC contact we get 'Auto-trip' indication
when the breaker is tripped by relay.

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