Fuse & Fuse Box
The pre-breaker overcurrent protection: a metal element that melts and opens the circuit when overloaded. Fuse boxes still serve many pre-1965 homes.
A fuse does the same job as a breaker, once. The blown fuse is replaced, not reset, and that is its quiet virtue: a fuse cannot be worn out by repeated trips. The problems are everything around it: 60-amp fuse services are undersized for modern loads, screw-in sockets accept oversized fuses (the infamous penny trick made permanent), and the panels are old enough that the wiring around them usually shares their age.
Insurance companies increasingly surcharge or decline fuse-served homes, which forces the upgrade conversation independent of any actual failure. The standard path is replacement with a modern breaker panel, often paired with a service upgrade since the labor overlaps.
Talking to a contractor about this?
Run the project past a licensed electrical pro first. Calls are answered around the clock and routed to a pro serving your area.
- Main Breaker : The single large breaker at the top of your panel that can disconnect the entire house, and whose rating (100, 150, 200 amps) defines your service size.
- Subpanel : A secondary breaker panel fed from the main panel, used to add circuit capacity or put breakers closer to where the power is used: garages, shops, additions, ADUs.
- Bus Bar : The rigid metal bars inside a panel that distribute power to the breakers.
- Double-Pole Breaker : A breaker occupying two panel spaces that connects across both hot bus bars to deliver 240 volts, used for dryers, ranges, AC units, EV chargers and other heavy loads.