An automatic relay is an electrically operated switch that uses an electromagnet to mechanically operate a switch. When a specific condition is met—such as the flow of current or a change in voltage—this switch closes or opens a circuit automatically. This action enables the control of high power devices or the protection of circuits without the need for manual intervention.

    The operations of automatic relays can be triggered by various factors, such as temperature, pressure, and current flow. Their capability to handle large amounts of power while being triggered by low power signals makes them indispensable in numerous applications.