... .5A,10A,15A,20A. For 10A-10KA,use external current transformer with secondary current 1A or 5ASpecificanon of voltmeters:3V,5V,7.5V ... ,200V,250V,450V500V,600V, For450-450KV meters can use potential transformer with secondary voltage 100V.Heat resi stance:Case of non ...