Low voltage fuses can be classified into
- Cartridge Fuses where the fuse element or the fuselink is located in a cartridge and
- Wirable Fuses where the fuselink is a wire that is wired over a ceramic fuse carriers
The material used for the fuselinks needs to have low melting and vaporising temperatures and low specific heat. This ensures that the fuselink acts quickly, melts and interrupts the circuit. The vast majority of fuselinks used today are alloys which use either copper or silver as the main ingredient in their construction.
The fuselink is enclosed in a filling material which is usually quartz. The function of the filling material is to absorb the energy released during fuse operation and to extinguish the arc which may occur.