A switch relay is essentially an electrically operated switch that can be controlled by a small amount of electrical current to switch a larger current. Relays work by using an electromagnet to create a magnetic field that causes the relay to either open or close contacts, enabling the flow of electricity to different circuits. This mechanism allows for the isolation of control circuits from high-power circuits, providing an extra layer of safety in electrical systems.

    Switch relays come in various types, including electromechanical relays, solid-state relays, and reed relays, each with specific advantages depending on the application. Electromechanical relays are known for their durability and versatility, while solid-state relays offer faster switching speeds and longer lifespans. Reed relays, on the other hand, are ideal for low-power applications due to their compact size and low cost.