Load-break Fuse switches Technical data for IEC 947-3 GB14048.3 In63 ~ 5000A AC400 、690 、 1000V XK 集 团 企 业 2009 Lrongxk 1 2 effects described manifest themselves both in the case of through faults and when the switches are closed on a short-circuit, due to the high closing speed of the switch. The extreme breaking capcity (Category AC3 at 660 V) is reached primarily by dividing the breaking pr