What is the function of a circuit breaker in electrical systems?

A circuit breaker serves the critical function of protecting electrical systems from overcurrent situations, which can lead to overheating, equipment damage, or even electrical fires. By detecting excess current flow through the circuit, the circuit breaker automatically interrupts the electrical circuit, cutting off the power to prevent further damage or hazardous conditions. This safety device is essential in maintaining the integrity of electrical installations and ensuring safety in residential, commercial, and industrial environments.

In contrast, enhancing voltage levels is not the role of a circuit breaker; instead, voltage regulation is typically managed by transformers and voltage regulators. Maintaining power quality, such as voltage stability and minimizing harmonics, requires other devices like filters and conditioners rather than a circuit breaker. Converting AC to DC is a function performed by rectifiers, not circuit breakers.