What is the difference between a circuit breaker and a fuse?

The distinction between a circuit breaker and a fuse primarily revolves around their functionality and operational characteristics. A circuit breaker is designed to interrupt the flow of electricity when a fault is detected, such as an overload or short circuit. One of its key advantages is that it can be reset after tripping, allowing the circuit to be easily restored to its normal operating condition without the need for replacement. This feature makes circuit breakers more convenient and cost-effective in the long run, as they do not require physical replacement like fuses do after they blow, thus enhancing their practicality and usability in electrical systems.

In contrast, fuses operate on a simple principle: they contain a metal wire that melts when current exceeds a certain limit, breaking the circuit. Once a fuse blows, it must be replaced entirely, which can be a disadvantage in situations where frequent interruptions might occur. This fundamental difference in operation—resetting versus replacement—highlights why the first choice is the correct answer.

The other choices do not accurately capture the primary functional differences. The assertion that circuit breakers are only for low voltage and fuses for high voltage is misleading, as both can be designed for various voltage ratings and applications. Stating that circuit breakers work with DC while fuses work only with AC