The answer to 'difference between circuit breaker and fuse' is that circuit breakers and fuses are both safety devices used to protect electrical circuits from overloads and short circuits, but they have some key differences. Circuit breakers are reusable devices that can be reset after they trip, while fuses are single-use devices that need to be replaced when they blow.
Circuit breakers are more convenient and cost-effective in the long run, as they can be reset instead of replaced. They also provide more precise overload protection and can be used to manually disconnect a circuit. Fuses, on the other hand, are generally less expensive upfront and provide a simpler, more basic level of protection. They are often used in older electrical systems or in applications where a circuit breaker isn't practical.