Generator Circuit Breaker (GCB)
GCB is also the circuit breaker with the major concern to protect generator during synchronizing process, overload, shortcircuit, out of step and so many function related to generator operation. Specific requirement you can find on IEEE or ANSI C37.013.
The characteristic of GCB is capabillity of carrying high rating current on normal and fault condition. GCB price is very high. Hence this only applied for high rating generator such as 25MW above. Not many vendor can produce GCB, only some such as ABB, Alstom and Siemens.
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