Relay

A relay is an electrically operated switch that uses an electromagnet to mechanically open or close contacts, allowing a low-power control signal to switch high-power circuits. When current flows through the relay's coil, it creates a magnetic field that attracts a movable armature, which then opens or closes the switch contacts. Relays provide electrical isolation between control and load circuits, making them essential for safely controlling high-voltage or high-current devices from low-power microcontrollers or sensors. They are commonly used in automotive applications, home automation, industrial control systems, and any application requiring remote switching of electrical loads.