
Fuses 23
the fuse wire melts. A disadvantage of semi-enclosed fuses, other than their
limited breaking capacity and longer operating time, is the tact that a blown
fuse wire may be replaced by one of an incorrect size.
Cartridge fuses
The fuse consists of a tube with two end caps to which the fuse element is
attached, and a filler. The tube or body is normally made of porcelain, or
bakelite, of high strength and resistance to intense local heating. The end caps,
of tinned brass or copper, are attached rigidly to the body of the fuse so that
they do not blow off when the fuse operates. With the larger sizes of fuse, lugs
or tags are brazed t ...