circuit breaker
A circuit breaker : is a switching and current-interrupting device" basically, a C.B. comprise a set of fixed and movable contacts.
the contacts can be separated by means of an operating mechanism.
the separation of current carrying contacts produce an arc.
the arc is extinguished by a suitable medium such as dielectric oil,air,vacuum,sf6 gas.
the circuit breaker serves two basic purposes :
1- switching during normal operation condition, for the purpose of operation and maintenance.
2- switching during abnormal condition, such as short circuits, and interrupting the fault currents.
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