In addition, automotive relays are also widely used in scenarios such as automatic regulation, safety protection, and conversion circuits. In cars, relays usually need to be able to withstand harsh environmental conditions such as high and low temperatures, sand and dust, water, salt, oil, etc., as well as vibration and impact.

The main function of automotive relays is to control high currents, as directly controlling high currents through switches may generate electrical sparks and cause danger. Automotive relays belong to switches that control high current with low current, and are a type of electrical component in automotive electrical systems.