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

A circuit breaker serves a crucial role in electrical systems by providing protection against overloads and short circuits. Its primary function is to interrupt the electrical flow when it detects an abnormal condition, such as excessive current due to an overload or a fault in the circuit. This automatic interruption helps prevent damage to wiring, equipment, and connected devices, which could otherwise result in overheating, fire hazards, or permanent failure.

By tripping and disconnecting the power supply, a circuit breaker ensures that the system and its components remain safe during abnormal conditions. This protective feature is essential for maintaining the integrity and reliability of electrical installations.

While increasing efficiency, improving voltage, or ensuring constant current might be important in other contexts, they do not directly relate to the protective function that a circuit breaker provides. Hence, the primary purpose of a circuit breaker is indeed to safeguard against overloads and short circuits.