What mechanism does a circuit breaker use to operate?

A circuit breaker operates using an automatic mechanism that opens the circuit in response to overloads or short circuits. This design is crucial for protecting electrical systems and preventing potential hazards, such as fires or equipment damage. When the current exceeds the rated limits due to an overload or fault condition, the circuit breaker quickly senses this change and interrupts the current flow by opening the circuit. This automatic action is what distinguishes circuit breakers from devices that require manual intervention, ensuring that it can react promptly to dangerous electrical conditions without delay.

In contrast to manual options, which require human operation, the automatic feature provides essential protection. While there are reset switches and manual levers in some device designs, they do not represent the primary operating mechanism of a standard circuit breaker. The system's inherent ability to detect issues and operate autonomously is its most critical function, making it a vital component in modern electrical systems.