A 12V automotive relay is an electromagnetic switch that uses an electrical signal to open or close circuit paths. This allows a small current to control a larger current, thus regulating devices that require substantial power without the risks associated with high voltage directly feeding into control switches. Relays are typically designed to operate on a 12-volt direct current (DC) supply, making them suitable for most automotive batteries.

    How Does a 12V Automotive Relay Work?

    The working principle of the 12V automotive relay is quite straightforward. The relay consists of a coil, a movable armature (also known as a contact), and two electrical contacts. When a low-voltage current flows through the coil, it generates a magnetic field that attracts the armature, causing it to move and close the circuit at the contacts. This allows a high-voltage and high-current circuit to be activated without having a direct connection to the vehicle's control switches, which can often be low power.