An electromagnetic relay is a type of electrical switch that is operated by an electromagnet. When an electric current flows through the coil of the relay, it generates a magnetic field that attracts a movable armature, which in turn changes the state of one or more electrical contacts. These contacts can either close or open, depending on the type of relay. The relay, thus, allows one circuit to control another circuit without direct electrical connection, making it crucial for both low- and high-voltage applications.

    Basic Structure and Components

    Electromagnetic relays typically consist of four main components：