Relay System's Application in the Industry Check out the full blog post over at https://realpars.com/what-is-a-relay-system/ A relay is an electrical device that closes one circuit by being energized by another circuit. These can be used for many reasons. One that we covered today was for safety. When we use a relay to power a high voltage or high current device, while a lower voltage is used to power the controls that energize the relay. Relays are commonly controlled with switches, push button