What does the circuit breaker in the instrument lighting system primarily protect?

The circuit breaker in the instrument lighting system is primarily designed to protect wiring from too much current. When the current exceeds a certain threshold due to faults or overloads, the circuit breaker interrupts the flow of electricity, effectively preventing potential damage to the wiring. This protection is crucial because excessive current can generate heat, leading to insulation breakdown, short circuits, or even fires within the aircraft’s electrical system.

While circuit breakers may indirectly protect lights and instruments from damage by interrupting current, their primary role is to safeguard the integrity and safety of the wiring itself. Maintaining proper current levels prevents overheating and ensures reliable operation of all electrical components within the system.