What function does an isolator switch perform in an electrical circuit?

An isolator switch is designed to completely disconnect a circuit from its power source. This function is crucial for ensuring safety during maintenance or repair work, as it allows technicians to work on electrical systems without the risk of electric shock. By providing a clear and absolute disconnection from the power source, isolator switches help prevent accidents and protect equipment and personnel.

In situations where maintenance is required, isolators ensure that no current can flow through the circuit, which is particularly important for high-voltage applications. The complete isolation of the circuit means that even if other parts of the electrical network are energized, the specific circuit being serviced is safely disconnected.

Other choices represent functions that are not specific to what an isolator switch does. Regulating current flow or re-routing power supply involve devices that manage or direct electrical current rather than isolate a circuit. Converting voltage levels pertains to transformers, which serve a different purpose in managing electrical energy. Thus, the fundamental role of an isolator switch in providing a safe and complete disconnection of a circuit defines its primary function in electrical systems.