FAA AMT Airframe Test 2026 – 400 Free Practice Questions to Pass the Exam

The function of a circuit breaker is to interrupt the flow of electricity in a circuit when the current exceeds a certain limit, thereby protecting the components in the circuit from damage. In this case, the circuit breaker in the instrument lighting system is specifically designed to protect the wiring from being overloaded with too much current. The other options may also be important for the proper functioning of the system, but they are not the primary purpose of the circuit breaker in this case. B The switch may become hot due to high current, but this is not the main purpose of the circuit breaker. A: While the circuit breaker may indirectly protect the bulbs from burning out by preventing excessive current, its main purpose is to protect the wiring. D: Short circuits may cause excessive current, but the circuit breaker is designed to protect the wiring from any type of excessive current, not just from short circuits.