What does a circuit breaker do in an electrical system?

A circuit breaker serves a critical role in an electrical system by protecting the circuit from overloads and faults. When an excessive current flows through the circuit, typically due to a fault like a short circuit or an electrical overload, the circuit breaker detects this abnormal condition. It interrupts the flow of electricity, thereby preventing potential hazards such as electrical fires or equipment damage. This safety mechanism ensures that the electrical system operates within safe limits, allowing it to function effectively while safeguarding both devices and individuals.

The other provided options do not accurately describe the primary function of a circuit breaker. While increasing power output, reducing energy consumption, or enhancing connection stability may be beneficial aspects of various electrical devices, they do not reflect the protective function that a circuit breaker was specifically designed for.