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A relay is an electrically operated switch. It has a set of input terminals for one or more control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof. Relay can be a verb meaning to repeat or broadcast something, or a noun meaning a team, a race, or a device. Learn more about the meaning, usage, and examples of relay with Cambridge Dictionary. A relay is an electrically operated switch that can be used to control an electrical circuit. It typically consists of an electromagnet that, when activated by an electrical current, attracts a movable contact (or contacts) to close an electrical circuit. Relays are used in a wide variety of applications, such as controlling the operation of motors, lighting, and other electrical devices, and can be used to amplify electrical signals or to switch high-voltage or high-current circuits with a ... A Relay is a simple electromechanical switch. While we use normal switches to close or open a circuit manually, a Relay is also a switch that connects or disconnects two circuits.
