What is the function of a disconnect (or safety switch) in electrical systems?

The function of a disconnect or safety switch in electrical systems is to provide a means to isolate electrical circuits. This isolation is critical for ensuring safety during maintenance and repair work, as it allows personnel to safely work on electrical systems without the risk of accidental energization. Disconnect switches enable workers to quickly and effectively cut off power to specific circuits or equipment, making it easier to perform repairs or inspections safely.

Providing a means of isolation is essential for protecting both the electrical system and the workers, as it helps to prevent electrical shocks and reduces the risk of accidents. While it's true that overload protection and voltage regulation are important aspects of electrical systems, these functions are typically managed by circuit breakers, fuses, and voltage regulators rather than disconnect switches.