What is the primary function of a relay in a control system?

The primary function of a relay in a control system is to act as a switch. Relays are electromechanical devices that allow one circuit to control another circuit. When an electrical current passes through the coil of the relay, it generates a magnetic field that closes or opens the contacts. This enables the relay to switch the power on or off for connected devices, offering a practical means of controlling larger loads or isolating different parts of a system.

Relays are commonly used in various applications such as automation, safety systems, and control panels, where they provide the ability to manage electrical circuits with a low-power control signal. By utilizing relays, control systems can enhance operational flexibility and safety, as they allow for remote control and automated functions.

Other options do not align with the primary role of a relay. For example, storing control data is handled by memory components like EEPROM or RAM, monitoring temperature is typically assigned to temperature sensors, and providing backup power is the function of uninterruptible power supplies or battery systems. Thus, the correct understanding of a relay’s role emphasizes its function as a switching device within control systems.