What is the purpose of a disconnect switch?

The purpose of a disconnect switch is to allow safe disconnection of electrical equipment. This device is critical for ensuring the safety of maintenance personnel and the integrity of electrical systems. By providing a means to completely isolate a piece of equipment from the power source, a disconnect switch enables safe troubleshooting, repair, or maintenance without the risk of electrical shock or arc flash.

When electrical systems require servicing, it is essential to ensure that no power is present. The disconnect switch makes this possible by providing a clear method to cut off power. This is especially important in environments where workers may be working near high voltage or sensitive electrical equipment. The switch can typically be locked in the off position to further protect personnel from accidental re-energization.

Other functions related to electrical systems, such as regulating power flow to different circuits or measuring current, are not within the scope of what a disconnect switch is designed to accomplish, and converting AC power to DC power pertains to a different set of equipment entirely, such as rectifiers. Therefore, while those options describe important aspects of electrical systems, they do not accurately define the specific purpose of a disconnect switch.