An automotive relay is an electrical switch that uses a low-power signal to control a higher-power circuit. Essentially, it acts as a middleman between the vehicle's control system and the electrical devices that require substantial power, such as the starter motor, headlights, or cooling fan. Relays allow for precise control over these high-power components, all while safeguarding the vehicle's sensitive electronics.

    Automotive relays typically consist of an electromagnet, a set of contacts, and a spring. When the relay is activated by a low-power signal (often from the vehicle’s control unit or a switch), the electromagnet is energized. This causes the contacts to either open or close, completing or interrupting the electrical circuit. The use of relays allows for the switching of high-power components without subjecting the vehicle’s sensitive electronics to heavy electrical loads.