A 220V AC relay is an electromagnetic switch designed to control the flow of alternating current (AC) in circuits where high voltage (typically 220V) is involved. It consists of a coil, a set of contacts (normally open or normally closed), and a mechanical or magnetic armature. When an electric current flows through the coil, it generates a magnetic field that causes the contacts to either open or close, thereby controlling the connected load.

    The main advantage of using a relay is its ability to control high-voltage circuits using a low-voltage signal, making it an indispensable tool in the world of automation, control systems, and electronic devices.