What device is used to visually confirm that a circuit has been disconnected from electrical energy?

A disconnect is specifically designed to visually confirm that a circuit has been disconnected from the electrical energy. This device physically separates a portion of the electrical circuit from the power source, ensuring that no energy is present in the section of the circuit being worked on. Disconnects are often equipped with a clear visual indication (such as an open switch or a gap in the connection) that shows whether the circuit is in an open state. This feature is crucial for the safety of personnel working on electrical systems, as it allows technicians to safely perform maintenance and repairs without the risk of electrical shock.

Transformers and voltage regulators serve different purposes in electrical systems, primarily related to voltage changes and regulation rather than disconnection. Circuit breakers are safety devices that automatically cut the power in the event of a fault but do not provide a definitive visual confirmation of disconnection as a disconnect does. Thus, a disconnect is the most appropriate choice for indicating that a circuit has been isolated from the energy source.