Product Size: Directed Operated / CT Operated Accuracy: Active Class0.5/1.0 Reactive Class 2.0 Power Consumption: less than1.5W/6VA Rererence Voltage(V): 3-Phase 3 Wires:3x57.7/100V 3-Phase 4 Wires:3x220/380V Basic Current(A): 5(20)A,10(40)A,20(80)A (extended current is available on request) Operating Temperature: from -20 degree C to +55 degree C. Relative Humidity: less than 85% Main Functions 1. The user purchases electric power in advance and preset maximum load limit,alarm quantity and IC card password.IC card transmits data. 2. Storage of leave-factory serial number,meter constants,initial figure of the mechanical meter and user's name and address etc. 3. Backward reading of remaining electric power quantity,accumulated quantity of negative electric power and total number of purchases etc. 4. Alarm at low remaining electric power,alarm and switch off when overload and OK Wh cut off control