What is the primary purpose of an airbrake switch?

The airbrake switch is primarily designed to be manually operated where two circuits meet, which is essential for controlling and isolating electrical power in specific sections of a circuit. This functionality allows operators to safely maintain, troubleshoot, or facilitate other operational needs without affecting the entire system. The manual operation provides a direct means to control the flow of electricity and ensures safety by allowing for intentional interruption of the circuit.

In contrast, while some other options mention interrupting electrical loads or detecting faults, these functionalities are typically associated with different types of devices or protection mechanisms, such as circuit breakers or overload relays, rather than a manual airbrake switch. The purpose of the airbrake switch highlights its role in operational control, emphasizing the importance of manual intervention in electrical circuit management.