I was thinking that the fuse and breaker could have its own slot that only they could occupy and the machine wouldn't function without them as an added for very early if you didn't wont to craft a fuse you could put a wire in there. there would be no protection offered the machine would operate.
Also the recipe for the fuse was tried to make cheep so it would be easy to make the breaker quite a bit more expensive as it is more od a permanent fix as it will trip and not need either repair of trashed and a new one made
the electromagnet is a component of the circuit breaker very similar to a coil could be used instead