What is the function of a disconnect switch in an electrical system?

A disconnect switch plays a critical role in electrical systems by providing a safe means to isolate power during maintenance or in case of emergencies. This switch allows technicians or electricians to cut off the electrical supply to a particular part of the system, ensuring that they can work safely without the risk of electric shock or other hazards. This isolation is essential for conducting repairs or maintenance, as it protects both the workers and the integrity of the system.

Isolating power can prevent accidents and is a required safety measure in many electrical codes and regulations. It enables the safe operation of servicing and troubleshooting tasks, ultimately contributing to the overall safety and reliability of the electrical system. The other options listed do not accurately describe the primary purpose of a disconnect switch, as they pertain to control, monitoring, or energy efficiency rather than the essential function of ensuring safety through disconnection.