Relay meaning: A relay is an electrically operated switch

A relay is an electrically operated switch that uses an electromagnet to mechanically operate a set of contacts. It is widely used in circuits to control a high-power or high-voltage circuit with a low-power signal, providing isolation between the control and load circuits. To summarize, a relay is a simple electromechanical device used to control electrical circuits by opening and closing contacts in response to an external signal. 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. Relay definition: a series of persons relieving one another or taking turns; shift.. See examples of RELAY used in a sentence.