What is the purpose of isolators in a switchgear system?

The purpose of isolators in a switchgear system is to ensure safe maintenance by providing visible disconnection. Isolators are designed to disconnect parts of the electrical circuit to allow for maintenance work without the risk of accidental energization. This is crucial for the safety of maintenance personnel, as it provides a clear and visible indication that the circuit is fully de-energized, thereby minimizing the risk of electrical shock or injury while work is being performed.

The visible disconnection feature is vital as it helps technicians confirm that the equipment is safe to work on. Isolators typically do not interrupt the load current; instead, they are meant to be operated when there is no current flowing. This characteristic differentiates them from circuit breakers, which can operate while carrying current and are primarily used for protection.

While other components within switchgear systems may impact power efficiency, monitor loads, or prevent overcurrent conditions, the specific role of isolators centers on ensuring safety during maintenance through reliable disconnection.