switchdisconnectors

A switch disconnector is an electrical switching device used in power systems to isolate parts of a circuit. It is designed to be operated only when the circuit is not carrying load current, or when the current is very small. While it can interrupt fault currents under specific conditions, its primary function is safe isolation rather than circuit breaking. Switch disconnectors are typically used in conjunction with other protective devices, such as circuit breakers, which are designed to interrupt fault currents.

The operation of a switch disconnector is usually manual, although some may be motorized for remote control. They provide a visible air gap when in the open position, confirming that the circuit is electrically separated. This visible isolation is a crucial safety feature, particularly during maintenance operations, as it ensures personnel can work on the de-energized equipment with a high degree of certainty.

These devices are commonly found in medium and high-voltage substations, industrial facilities, and other electrical installations. They are available in various configurations, including indoor and outdoor types, and can be rated for different voltage levels and current carrying capacities. The design prioritizes safety and reliability in ensuring complete isolation.