What is the function of a circuit breaker in an electrical system?

A circuit breaker primarily functions to interrupt current flow in an electrical system when certain conditions are met, such as a fault or overload situation. This interruption is crucial for protecting the electrical circuits and connected devices from damage that can occur due to excessive current. By breaking the circuit, the breaker prevents overheating, potential fire hazards, and equipment failures that may arise from sustained high current levels.

In contrast, reducing voltage or increasing current are not functions of a circuit breaker. Additionally, while circuit breakers can disable a circuit, they do not provide power; their role is to act as a safety device to prevent the consequences of electrical overloads and short circuits.