Assertion: protection relay | /r/CapableOf | open the cb
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Source sentences:
text: If the circuit breaker is closed using TNC switch, and at the same instant let spring of TNC switch has failed and it did not came to its neutral state, and primary protection relay had been operated at this instant and opened the CB, since supply is being extended to 52C (CB closing coil) because of TNC spring failure, then CB will close again, since fault is still persisting the following cycle occurs.