What is the primary function of a sectionalizing switch?

The primary function of a sectionalizing switch is to isolate a faulty section of an electrical distribution line. This is crucial for ensuring safety and reliability in power systems. When a fault occurs, it is vital to cut off power only to the affected section to prevent damage and ensure that the rest of the network remains operational. The sectionalizing switch allows operators to quickly identify which segment of the circuit is experiencing issues and isolate it, enabling maintenance and repairs without disrupting service to the entire network.

In contrast to the other options, which describe different operations and equipment within electrical systems, the function of isolating a fault directly aligns with the role of a sectionalizing switch. Options that imply enhancing voltage or switching power sources do not pertain to the operation or intent of sectionalizing switches. Instead, they involve other devices designed for different purposes within the electrical distribution framework.