The variable cross-section fuse body made by pure copper/silver piece (or silver wire)is sealed in the fusion tube which is made by the high strengh porcelain; there is full of the high-purity quartzand processed after chemistry to take the extinguishing of arc medium in the tube. The two sides of the fuse use the spot welding to reliably connect with the end plate(pr juncion panel) and to form the knife shape contact insert type strucure. The fuse may have fuse indicator or striker, when the fuse element fusing i t can demonstrate fusing (indicator) or transforms each kind of singnal as well as automatic transfer circuit(striker).
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