The fully enclosed variety may use a fuse carrier that is inserted into a holder or have other means to fully enclose the fuse. Standard fuse sizes range from ¼” diameter, 5/8” length (1AG) to ¼” ...
Fuses in plugs are made in standard ratings. The most common are 3 A, 5 A and 13 A. The fuse should be rated at a slightly higher current than the device needs: if the device works at 3 A ...