A high current car relay is an electromechanical switch used to control large electrical currents in a vehicle’s electrical circuit. Its main function is to allow a small control current (usually low voltage) to switch on or off high current to power devices that require substantial amounts of electricity. The relay consists of a coil, contacts, and an armature. When the coil is energized, it generates a magnetic field that pulls the armature, closing or opening the contacts. This simple mechanism enables the relay to handle high current without putting strain on the vehicle's control circuits.