Which function does a circuit breaker perform during an overcurrent situation?

In an overcurrent situation, a circuit breaker performs the critical function of opening the circuit automatically. This means that when the current flowing through the circuit exceeds a predetermined safe level, the circuit breaker intervenes to disconnect the electrical flow. This automatic action is essential for protecting the circuit from damage that could arise due to overheating or fire hazards associated with excessive current levels.

The design of circuit breakers is such that they can detect overcurrent conditions, which could result from short circuits or overloads, and respond very quickly to ensure safety. By opening the circuit, the breaker effectively prevents further damage to the wiring, devices connected to the circuit, and can also protect against potential safety hazards.

The other options do not accurately describe the primary function of a circuit breaker. Redirecting the circuit does not align with the purpose of circuit breakers, which is to disconnect rather than reroute. While circuit breakers do have some ability to manage energy in specific ways, their primary action during an overcurrent event is to open the circuit. Limiting voltage and enhancing current are functions that contradict the purpose of a circuit breaker, as the device is designed to interrupt the flow of current altogether when a dangerous condition is detected.