If you hear a chirping sound from your fuse box, it isn't going to be one of our feathered friends trapped in there, and it's unlikely to be an insect either. It is almost certainly some kind of ...

An MCB (miniature circuit breaker) can be reset and uses an electromagnet to open a switch if the current goes above a certain value. MCBs switch off the current faster than a fuse. An RCCB ...