What distinguishes an isolating switch from other types of switches?

An isolating switch is specifically designed to ensure safe disconnection of electrical circuits, and it is distinguished by its lack of an interrupting rating. This means it is not intended to interrupt live loads or operate under load conditions. Instead, an isolating switch is used after the circuit has been opened, providing a way to isolate a circuit safely for maintenance or service. This characteristic ensures that personnel can work on the circuit without risk of accidental energization.

The design and operational standards for isolating switches prioritize safety and the necessity of ensuring that the circuit is not live at the time of disconnection. Therefore, isolating switches play a critical role in systems by allowing safe access to electrical equipment after the circuit is de-energized. Other types of switches, like circuit breakers or load switches, are built to handle operations while the circuit is energized, which underscores the unique function of isolating switches.