... .They are sealed in the fuse tube filled with chemically treated high-purity quartz sand.The fuse tube is made from heat ... glass.When fault circuit happens,the fuse link melts,the high-resistant metal wire paralleling to fuse linsk melts immediately at the ... many merits and high current-liming ability,high breaking capacity,quick and punctual in action,reliable in performance High Voltage Fuse type A/ ...