What is the main purpose of a disconnect switch in an electrical system?

The main purpose of a disconnect switch in an electrical system is to provide a means to safely turn off power to a circuit. This device allows for the disconnection of electrical supply from the circuit, which is essential for safe maintenance, troubleshooting, or repairs. By allowing personnel to ensure that the circuit is completely de-energized, the switch enhances safety and protects against electrical hazards during these activities.

The disconnect switch is critical for complying with safety standards and regulations, which often require that equipment be completely isolated from its power source before maintenance can be performed. This device does not necessarily increase circuit efficiency, prevent electrical surges, or monitor current levels, as its primary role is to enable safe operation and maintenance of electrical systems.