Motor Control, Lighting, HVAC, Power, 2,  3 or 4 pole.  Efficient New Streamline, Smaller, Low Power Drain, Low Noise, Easy to Install

A contactor is an electrically-controlled switch used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 240-volt motor switch.