Main technical data: 1)Rated voltage drop range:1A-50A 10mV~800mV;51A-2500A 10mV~300mV;2501-12000A 10mV~100mV; 2)Ambient condition-25~+40℃;Relative humidity≤80%(35℃); 3)Temperature rise:Put in rated current for 2hr,after the temperature rising steady test it:When the rated current less than 100A,the temperature rise should be no more than 80K;When the rated current more than 100A,the temperature rise should be no more than 120K. 4)Over load performance:120% of rated current for 2hours.