... arc over. Its fixed isolation voltage is 750V, is suitable in exchanges 50Hz,fixed working voltage 690V and below, the fixed ... the power equipment is not damaged.if you are intercede in these products,Please feel free e mail me for price ... /25/22.5/12.5/1--NF-50CS2,310,15,20,30,40,50A5/25/22.5/12.5/1--NF-60CS360A5/25 ... .52.5/1.52.5/1.0--NF-50SS310,15,20,30,40,50A5/1010/7.57.5/57.5/52.5/1 ...