YCHR17 series fuse switch-disconnector is a new product, it's rated insulation ... 50/60Hz,The standard is according to IEC60947-3. Rated thermal current (A) 160 250 400 630 Rated insulation voltage ( ... NT00 NT1 NT2 NT3 Rated current of matched fuse in 400V (breaking capacity ) 20,25,32,35,40,50,63 ... ,355,400,425,500,630(≥100kA) Rated current of matched fuse in 690V (breaking capacity ) 20,25,32,35,40,50, ...