Industrial relays are electromechanical devices that are used to control electrical circuits. They consist of an electromagnet that is used to operate a switch or set of switches, which can be used to turn a circuit on or off. Industrial relays are often used in industrial control systems, where they can be used to switch high-voltage or high-current circuits. They are available in a wide range of sizes, ratings, and configurations to suit different applications. Some common types of industrial relays include latching relays, which can maintain their state even after power is removed, and time delay relays, which can be used to introduce a delay in a circuit.