Operating duty of a Circuit Breaker

According to ANSI/IEEE C37.4-1999, clause 5.6: "Rated standard operating duty (standard duty cycle). The standard operating duty of a circuit breaker is:

O - t - CO - t' - CO

Where:
O = Open;
CO = Close - Open
t' = 3 minutes
t = 15 seconds for circuit breakers not rated for rapid reclosing, and
t = 0.3 seconds for circuit breakers rated for rapid reclosing".


Sidharthan.G
Electrical Miracles.





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