Which device is used to isolate a segment of the power grid for maintenance?

The correct choice is Switchgear because it is designed specifically to control, protect, and isolate electrical equipment. In the context of maintenance, switchgear provides a safe means to disconnect portions of the electrical grid, allowing technicians to work on sections of the power system without the risk of energized lines. This functionality is crucial for safely maintaining and repairing electrical equipment, thereby ensuring the reliability and safety of the power distribution system.

Switchgear encompasses various devices, including circuit breakers and disconnect switches, allowing operators to manage the electrical flow effectively. This is vital in preventing accidental energization while maintenance personnel are performing their work.

Other devices listed serve different primary functions: A recloser is used primarily for automatic fault isolation and restoration rather than maintenance isolation. A voltage regulator regulates voltage levels to provide consistent power supply, while a capacitor bank manages power factor and voltage stabilization, neither of which directly isolate segments of the grid for maintenance purposes.