When would an isolator switch most commonly be used?

An isolator switch is primarily designed for maintenance and safety purposes. It is used to completely disconnect a circuit from the power supply, ensuring that technicians or maintenance personnel can safely work on electrical equipment without the risk of electric shock or accidents. This complete disconnection is crucial when servicing or repairing machinery, as it provides a clear method to ensure that all power is off, thereby enhancing workplace safety.

Isolators are typically operated manually and are not intended for regular circuit operation; instead, they serve as a safety device. Their purpose is to isolate specific parts of electrical systems, allowing safe maintenance work to occur without interference or risk from live wires.

In contrast, using an isolator during normal operation could lead to unnecessary interruptions, and relying on it for power surge protection or noise reduction does not align with its designated function. Understanding the specific applications for isolator switches highlights their vital role in promoting safety and effective maintenance strategies in electrical systems.