A relay is an electrically operated switch that allows a circuit to be controlled by a low-power signal or to control multiple circuits with a single signal. These devices are essential for providing automation, protecting systems, and enabling the smooth functioning of complex electrical systems. Relays are used in applications where it is necessary to control high-voltage or high-current circuits with a low-power signal. They are designed to isolate the control circuit from the load circuit, preventing damage to delicate components.

    Relays come in various types, including electromagnetic, solid-state, thermal, and hybrid relays, each suited to different requirements depending on factors such as voltage, current rating, switching speed, and environmental conditions. The versatility and adaptability of relays make them integral to modern technological infrastructure.