A power relay is an electrically operated switch that allows for the control of electrical circuits by opening or closing the connection between contacts. Unlike mechanical switches, relays are typically used in automated systems where remote operation or protection is needed. Power relays are designed to handle high power levels, which makes them suitable for applications in various industries, including automotive, industrial machinery, HVAC, and consumer electronics.

    These relays consist of several components, including an electromagnet, a set of contacts, and a spring. When current flows through the electromagnet, it creates a magnetic field that pulls the contacts together, allowing electricity to flow through the circuit. Conversely, when the current is removed, the spring mechanism returns the contacts to their original position, interrupting the flow of electricity. This action can be used for a variety of functions, such as turning on/off appliances, controlling motors, or triggering alarms.