Question

where is the main fuse connected in a house circuit

Answer 1

A fuse is nothing more than a short length of wire designed to melt and separate in the event of excessive current. Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component

Answer 2

Outside the house in the main switch where the electricity passes from the electric poles to the house .