M · Glossary
Main fuse
Also known as Cut-out fuse, Service fuse
Main-fuse wording refers to the incoming supply fuse or cut-out fuse, not proof that the home has spare electrical capacity for new equipment.
The main fuse, often called the cut-out fuse or service fuse, is the fuse in the incoming electricity supply equipment, usually close to the meter. It sits before the consumer unit and may be recorded or checked when the property supply is assessed for solar, battery storage, EV charging, heat-pump equipment or other high-demand loads. The main fuse is separate from the fuses or circuit breakers inside a consumer unit.
Category
Electrical supply and protection
Applies to
Solar, Battery storage, EV charging, Heat pumps & AC
Last reviewed
02 Jun 2026