Introduction:

The aim of a circuit breaker is to break the circuit and stop the current flow while the current exceeds a predetermined value without causing damage to the circuit or the circuit breaker. Circuit breakers are generally used in place of fuses and sometimes eliminate require for a switch. The circuit breaker differs from a fuse in which it "trips" to break the circuit and might be reset, although a fuse melts and must be replaced. ACBs (Air circuit breakers) are breakers where the interruption of the breaker contacts takes place in an air environment.  OCBs (Oil circuit breakers) use oil to quench the arc while the breaker contacts open.