What is the purpose of a disconnect switch?

A disconnect switch is a crucial safety device designed to safely isolate a circuit from the electrical supply. This isolation is essential during maintenance or repairs, ensuring that technicians can work on the electrical system without the risk of accidental energization. By providing a clear means to disconnect power, these switches help prevent electrical shock and other hazards, making them integral to both safety procedures and operational protocols in electrical systems.

In contrast, the other options focus on aspects of electrical circuits that disconnect switches do not address. Controlling the amount of current in a circuit pertains to devices like circuit breakers or rheostats that manage flow, while enhancing device performance involves components designed for efficiency or optimization. Lastly, measuring voltage is done using voltmeters or multimeters, which are specifically designed tools for that purpose, rather than disconnect switches. Thus, the primary function of a disconnect switch emphasizes safety and isolation in electrical systems.