Relays are electromechanical or solid-state devices used to control a high-power circuit with a low-power signal. These devices are commonly used in automotive systems, industrial control panels, and automation systems, where they act as switches for controlling motors, lights, and other high-power devices. Relays provide isolation between control circuits and power circuits, ensuring safety and reliability.

With their ability to handle high currents and voltages, relays are essential for controlling large electrical loads in systems that require precise switching. For engineers working on control systems, relays provide a reliable and efficient solution for managing power.