A contactor is an electrical switch that controls the flow of electricity in industrial and commercial applications. They are commonly used in motor control, heating and cooling systems, lighting control, and power distribution. These electrical devices are designed to handle high currents and voltages and are capable of switching circuits on and off remotely. Selecting a suitable contactor depends on factors such as voltage, application, and environment. SIGMA Surplus has a large inventory of Allen Bradley contactors, Eaton contactors, Schneider Electric contactors, and many more from popular manufacturers.