What is a common application of a circuit breaker in electrical installations?

A circuit breaker is a critical component in electrical installations primarily designed to automatically disconnect circuits in the event of a fault. This function is vital for safety; when there is an overload, short circuit, or any electrical fault that could lead to hazardous conditions such as electrical fires or equipment damage, the circuit breaker interrupts the flow of electricity.

By doing so, it protects both the wiring and connected devices, ensuring that potential hazards are minimized. This automatic disconnection capability distinguishes circuit breakers from other devices that may provide manual control or enhance performance without addressing safety during fault conditions. The quick response of a circuit breaker to fault conditions exemplifies its role in maintaining the integrity of the electrical system and safeguarding the property and lives of individuals present.

In contrast, the other options describe functions that do not characterize the primary purpose of circuit breakers. Enhancing performance and regulating voltage are duties related to different types of equipment, while providing a manual switch pertains more to isolation switches rather than the automatic safety function of circuit breakers.