Cartridge type fuse and cartridge fuse diagram
Cartridge fuse
Cartridge fuse is designed for high voltage, low voltage and miniature applications.Cartridge fuse link, which is replaceable is often fitted into a fuse holder that consists of a fuse carrier and fuse base, an example being shown in figure 1.4.
Cartridge fuse links for low current ratings contains a single element while those for higher ratings have a number of parallel connected elements. The elements are usually of silver or silver plated copper, it being necessary to ensure that oxidation will not occur as stated earlier. Wire elements are used in cartridge fuses with ratings below 10 amperes but for higher rated strips with one or more sections of reduced cross-sectional area are used. The elements are attached to plated copper or brass end caps which together with the body form an enclosure or cartridge. In cartridge fuse link, the bodies which must be good insulators, must also be robust and able to withstand the conditions which occur during the interruption. They were almost exclusively of ceramic or glass in the past but glass reinforced plastics have been introduced in recent years. For high breaking capacity cartridge fuse link, the space within the body is usually filled with quartz of controlled grain size and chemical purity. A cross-sectional view through cartridge fuse link is shown in figure 1.5.
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