... frequency 5HZ rated current 160A-630A 1 Use HR17 series fuse type isolating switch,rated insulating voltage AC 800V,rated operating voltage ... 690V: AC-20B ,AC-21B, AC-22B2.6 Fuse link installed: The fuse is conformity with GB13539.1,relation of switch and ... Rated limiting short current:When the switch installed with standard fuse, the rated withstanding short making capacith is 50kAunder the condition ...