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The figure demonstrates the closed and open contacts. When the current carrying contacts are separated, arc is produced between them.
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During separation arc is produced between the contacts, which must be extinguished in order to stop the flow of current. When a fault occurs in a system, the trip coil of the breaker energizes and moving contacts are separated through a mechanism. The contacts of the circuit breaker remain closed during normal conditions and are opened when a fault occurs. PRINCIPLE OF OPRERATION OF A CIRCUIT BREAKER: Control circuit diagram of circuit breaker The contacts remain closed during normal conditions and are opened when a fault occurs.Ī control circuit of a circuit breaker is shown in the figure. The arc can be extinguished by any insulating medium such as air, dielectric oil, SF6 and vacuum etc. If the arc is not extinguished, the contacts can get welded together.
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Similarly different pole circuit breakers exist depending upon the number of sets of fixed and moving contacts.Įach pole consists of an arc extinguishing chamber. If there is a single set of fixed moving coil and the circuit breaker is connected in a single phase then it is called single pole circuit breaker. How circuit breaker works ?īasically a circuit breaker consists of a fixed and a moving contact. How circuit breaker works ? What is Circuit breaker?Ī breaker is a device which is used to turn a circuit on or off during normal operating conditions and automatically breaks the circuit during abnormal conditions when heavy currents start flowing through the system due to some fault.