Contactor

A contactor is a device for opening and closing an electric power circuit.

Usually a magnetically operated switch for repeated operation, but may include a mechanical latching system to hold the contactor closed without requiring a continuous power supply.

A contactor differs from a circuit breaker in that it is able to operate a lot of times, >300000 compared to 10000 for a circuit breaker. Generally contactors have lower continuous current ratings than ANSI circuit breakers and have lower interrupting and making capacities.

A contactor is not intended to interrupt fault current on its own and is therefore often used in association with fuses or a circuit breaker.


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Subjects: Electrical Engineering