A relay is an electrically operated switch that allows a low-voltage signal to control a high-voltage or high-current circuit. The 12V 100A relay is designed to operate with a control voltage of 12V, which is common in automotive systems, and can switch electrical loads that draw up to 100 amperes of current. This relay is typically composed of a coil that, when energized with the 12V signal, creates a magnetic field strong enough to pull contacts together, thus closing the circuit and allowing current to flow through the load.

    The “100A” part of the name refers to the maximum amount of current the relay can handle. A 12V relay capable of handling 100 amps is generally used for controlling large loads, such as motors, lights, or other electrical equipment that require a high current to operate.