AC-1, 18 Amp. AC-3 Normally Open (N.O.) contacts 600V 32A. Incandescent, LED or resistive load 20A. Ballast, Motor 7.5HP @480V Auxiliary contact 1NO/1NC Power Lug Terminal Capacity AWG # 6 Coil 110/120VAC A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings.A contactor is controlled by a circuit which has a much lower power level than the switched circuit. Contactors come in many forms with varying capacities and features. Unlike a circuit breaker, a contactor is not intended to interrupt a short circuit current. Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 V DC to many kilovolts. The physical size of contactors ranges from a device small enough to pick up with one hand, to large devices approximately a meter on a side. Contactors are used to control electric motors, lighting, heating, capacitor banks, thermal evaporators, and other electrical loads.