What is the purpose of an airbrake switch in electrical systems?

An airbrake switch is designed to allow manual control at circuit junctions. This functionality is essential in electrical systems, particularly in industries like utilities, where precise control over various electrical pathways is crucial for safety and operational efficiency. By providing the ability to manually intervene in a circuit, the airbrake switch enables operators to isolate specific sections of the network, allowing for maintenance or troubleshooting without disrupting the entire system. This capability is vital for safely managing the flow of electricity and ensuring that maintenance personnel can work without live electrical hazards.

The options related to primary circuit breakers, managing overload conditions, and replacing fusible links do not capture the specific purpose of an airbrake switch. These functions are typically associated with other components in electrical systems that serve different roles in protection and circuit management.