Allmän
The variable cross-section melt made of pure silver sheet (or siver wire winding)is soldered with low-temperature tin and packaged in a fusion tube made of high- strength porcelain.The fusion tube is filled with chemically treated and specially processed Process-treated high-purity quartz sand isused as the arc-extinguishing medium,and the two ends of the melt are firmly electrically connected with the contacts byelectric welding.