What is the role of circuit breakers in aircraft systems?

Circuit breakers play a critical role in aircraft systems by protecting electrical circuits from overload. When an electrical circuit experiences an excess flow of current—often due to short circuits or equipment malfunctions—the circuit breaker automatically interrupts the current flow. This helps prevent overheating, fires, and damage to the electrical components and wiring within the aircraft. In essence, the circuit breaker is a safety device designed to ensure that electrical systems operate within their rated capacities, thereby maintaining the integrity and safety of the aircraft's electrical system.

The other options do not accurately describe the function of circuit breakers. While increasing voltage or regulating power would imply a modification of electrical characteristics, that is not the purpose of a circuit breaker. Similarly, reducing overall power consumption or regulating cabin temperature falls outside the scope of what circuit breakers are designed to accomplish. Their primary purpose is clearly defined as protection against overloads in electrical circuits.