What is a contactor on your ac unit?

A contactor in an air conditioning unit is an electrically operated switch that controls the flow of electricity to the compressor and the condenser fan. It acts as a relay, allowing the system to turn on and off based on the thermostat's signals. When the thermostat calls for cooling, the contactor closes, enabling power to the necessary components for operation. If the contactor fails, it can prevent the AC unit from functioning properly.