What is the main function of the circuit breaker in the instrument lighting system?

The primary function of a circuit breaker in the instrument lighting system is to protect the wiring from excessive current. This is crucial because if the current flow exceeds the rated capacity of the wiring, it can lead to overheating, which may cause insulation failure, potentially resulting in electrical fires or system malfunctions. The circuit breaker serves as a safety device that automatically disconnects the electrical supply when it detects an overload or short circuit, thereby preventing damage to the wiring and connected components.

While other functions, such as enhancing lighting performance or supplying power to additional systems, may be relevant in different contexts, they do not pertain to the specific and critical role that a circuit breaker plays in safeguarding the electrical infrastructure of the instrument lighting system. The focus on current protection underscores the importance of safety and reliability in aircraft systems.