The Resideo R8246A1004/B Electric Heat Contactor is an electrical switching device designed to control electric heating elements in HVAC systems. It operates by using a low-voltage control signal from the thermostat to energize the contactor, allowing high-voltage power to flow safely to the heating components. Commonly used in electric furnaces, air handlers, and packaged HVAC units,... https://www.partshnc.com/r8246a1004b-resideo-quiet-elechtcontactor