Main function: Anti-electricity theft; measure accurately under current reserved phase, load grounding, current loop short circuit and so on.. Main technical data: 1、 working voltage:0.9un-1.1un 2、 power consumption: voltage circuit is less than 2W(10VA), current circuit is less than 2.5VA 3、 error range: conform to GB/T17215-2002 4、 start: under reference voltage, reference frequency and COS=1.0, when load current is 0.4%IB,the watt hour meter can start and continuously measure the electricity. 5、 Creeping: when the circuit is applied 1.15Un, the current circuit breaks, the watt hour meter output test pulse is not more than one. 6、 Specified working temperature:10~45degree. 7、 Utmost working temperature:-25~55degree.