What size Mini circuit breaker is the same as a 13 amp fuse?

13 amp breaker. A fuse and circuit breaker perform the exact same function so they should be the exact same size. They protect the wiring within a circuit from overheating and catching on fire.

A 13 amp breaker is a superior product that has a good chance of operating between 13 and 13½ amps, while a fuse might not blow until the current reaches 15 amps.