The Schneider Electric Square D 31041-400-42 is a 120-volt coil magnetic contactor intended for use in a variety of HVAC applications. It manages the flow of electricity to powerful parts like compressors, motors, and heaters by acting as an electronically controlled switch. The coil completes the circuit and allows current flow when it is powered. https://www.partshnc.com/31041-400-42-schneider-electric-square-d-120v-coil-formagneticcontactor