MC ac contactor MC(LS) series AC contactor is suitable for using in the circuits up to the rated voltage 660VAC 50Hz or 60Hz, rated current 9A to 85A, making and breaking and frequent starting, controls the AC motor. Combined with the auxiliary contact group, air delayer, machine interlocking device etc, it is combined into the delay contactor, mechanical interlocking contactor, drat-delta starter, with the thermal relay, it is combined into the electro magnetic starter.