This series of uses are mainly used in circuits of AC 50Hz, rated voltage of 1500V and rated current of 1000A, to protect the semiconductor components and the whole unit from short circuit. The breaking capacity of the fuses is up to 100kA The fuses are compliant with the IEC60269-1 IEC60269-4 and GB13539.1 GB/T13539.4.The variable cross-section fuse element made of pure silver sheets are sealed in the melting tube made of epoxy glass fibre which is heat resistant. The fuse tube is filled with chemically-treated high-purity quarts as arc-extinguishing medium,The two ends of the melting body are connected to the (knife) contacts by dot welding.The models, dimensions, ratings are shown in Figures 7.1~7.6 and Tables 7 .