Finally, there is usually (but not always) a ‘zero-crossing detection circuit’. This causes the relay to wait until ... but I added a one ampere fuse on the mains input to prevent it from ...

The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that ...

These circuit breakers have two states ... E-fuses, which are placed into a computer chip, function like a mash-up of a fuse and a relay (basically an electrically powered switch) but with ...