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Variable cross-section fuse element made from pure metal sealed in cartridge made from high-duty ceramic or epoxy glass. Fuse tube filled with chemically treated high-purity quartz sand as arc-extinguishing medium. Dot-welding of fuse element ends to the caps ensures reliable electric connection; Striker may be attached to the fuse link to provide immediate activation ous signals or cut the circuit of micro- switch to give variautomatically.Special fuse as per Figure 1.2~1.4 can be supplied according to customers requirements.