Cartridge fuses come in a cylindrical shape and have contacts points at each end. They have a fuse link connected to the two ends and are rated for 240-volt circuits and protect the circuit from over-current. The Ferrule-type fuses are rated up to and including 60 amps.
It's big brother, the knife-blade cartridge fuse, is similarly shaped with blades on each end. The difference is that they protect circuits above 60 amps up to 600 amps. All of these fuses can be installed and removed by using a special tool, a fuse puller. It mimics the shape of the fuse and snaps over the fuse for easy removal. It is usually made out of plastic.