A relay power supply is essentially a power distribution system that uses a relay to control the delivery of power from one circuit to another. A relay is an electrically operated switch that opens or closes contacts to control the flow of current in a circuit. The relay itself is activated by a low-power control signal, typically from a microcontroller or other low-voltage electronic device, and when the relay is triggered, it either allows or interrupts the high-power circuit's current flow.

    This arrangement enables the control of high-voltage or high-current equipment, such as motors, lights, and industrial machinery, using low-power electronics. Relay power supplies are commonly used in industrial automation, automotive applications, home appliances, and many other fields.