What are the main functions of a circuit breaker?

The main functions of a circuit breaker center around safety and protection in electrical systems. Specifically, a circuit breaker is designed to provide overcurrent protection, which means it automatically interrupts the flow of electricity when the current exceeds safe levels. This prevents potential damage to electrical equipment, reduces the risk of fires, and enhances overall system reliability.

In addition to overcurrent protection, circuit breakers can disconnect circuits during faults—this may include short circuits or ground faults—ensuring that these dangerous conditions do not cause further harm to the electrical system or pose risks to individuals. By interrupting power flow during such incidents, circuit breakers play a crucial role in maintaining the integrity of electrical installations and safeguarding users.

This understanding underscores the importance of the correct function attributed to circuit breakers. Other options may highlight aspects such as efficiency or aesthetics, but these do not reflect the primary, critical roles that circuit breakers serve in protecting electrical circuits and ensuring safety.