Have you ever heard of functional devices relays? It’s what runs the world behind the scenes! Functionally designed devices relays are typically used in industrial automation and process control applications. They provide a means of connecting electrical circuits together while controlling the power to the circuits, or devices, within the circuit. At their most basic level, functional devices relays are simple on/off switches that close a circuit when activated. But with multiple components, these relays can be used to build complex control systems. So if you’re looking for the official business definition of functional devices relays, here it is: Functional Devices Relays are critical components that enable modern electrically-controlled system operations, allowing them to respond to changes in a wide variety of conditions.