Cartridge Fuse

The cartridge fuse operates exactly like the plug-type fuse. In the cartridge fuse, the fuse link is enclosed in a tube of insulating material with metal ferrules at each end (for contact with the fuse holder). Some common insulating materials are glass, bakelite, or a fiber tube filled with insulating powder. Figure 5 shows a glass-tube fuse. In figure 5, view A, notice the fuse link and the metal ferrules.

Figure 5, view B, shows a glass-tube fuse that is open. The open fuse link could appear either of the ways shown in figure 5, view B.

Cartridge fuses are available in a variety of physical sizes and are used in many different circuit applications. They can be rated at voltages up to 10,000 volts and have current ratings of from 1/500 (.002) ampere to 800 amperes. Cartridge fuses may also be used to protect against excessive heat and open at temperatures of from 165°F to 410°F (74°C to 210°C).