What is the function of circuit breakers in aircraft electrical systems?

Circuit breakers in aircraft electrical systems serve the vital function of protecting electrical circuits from overload. This protection is pivotal because, in the event of an electrical fault or circuit malfunction, excessive current can cause damage to wiring, components, and potentially lead to system failure or fire hazards.

By interrupting the flow of electricity when it detects a fault condition (typically overcurrent), circuit breakers ensure that only the affected circuit is shut down, allowing other systems to remain operational. This enhances overall safety and reliability of the aircraft's electrical system.

In addition to current protection, circuit breakers can also be reset after they are tripped, which provides a convenient way to restore system functionality without needing to replace a fuse or similar component.