1,YCHR17 Fuse type switch disconnector; 2,Rated thermal current (A):160,250,400,630; ... GeneralYCHR17 series fuse switch-disconnector is a new product, it's rated insulation voltge up to 800V,rated operationalvoltage up to 690V,rated operational ... current up to 630A,rated frequency 50/60Hz,The standard is according to IEC60947-3 ...