The Cutler Hammer–Eaton C25DNJ350A 3-Pole Contactor is a heavy-duty 50A, 120V control component designed for demanding HVAC applications. It uses an electromagnetic coil to open and close electrical circuits, providing safe and reliable power switching for compressors, electric heaters, and large air-handling units. https://www.partshnc.com/c25dnj350a-cutler-hammer-eaton-3p-50a-120v-contactor