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Dec 07, 2016

Contactors: It is used for long distance frequently switching on and off AC & DC main circuit and large capacity control circuit, the main control objects are electric motors, lighting, capacitor bank, etc., divided into AC contactor and DC contactor. 

Compared with the circuit breaker, the difference is: action frequency is very high (therefore require the electrical life and mechanical life long enough); high breaking and connecting capacity, but generally used in the 1kV and below voltage levels, can't be compared with a circuit breaker of hundreds of tens of kilovolts.