An industrial control relay is essentially an electromagnetic switch. It consists of an electromagnetic coil, moving and stationary contacts, and a frame. When an electrical current flows through the coil, it generates a magnetic field that attracts the movable contacts, thereby completing the circuit. This interaction allows a small control signal to manage larger power loads, making relays indispensable for efficient control in industrial settings.

    Operating Principle

    The operational principle of an industrial control relay involves converting electrical energy into mechanical energy. Upon energization of the coil, the magnetic field created pulls in a lever that connects or disconnects the relay contacts. When the current is interrupted, a spring mechanism returns the contacts to their default position. This electromechanical action allows for the reliable control of various electrical devices, enabling them to start, stop, or change states based on the requirements set by an automation controller (like a PLC).