Main Features: 1 Accurate active energy measurement for long-term operation without calibration under normal operation condition; 2. IC card is adopted for prepaid energy consumption and able to display current read/surplus/accumulated/ energy value, preset permitted load value, alarming energy value, max load; 3 Alarm at low remaining power and switch off the power supply to remind the user of timely purchasing; 4 Recording the extraordinary events,automatically recording all data of illegal energy consumption events;Alarm for overload,switch off the power if overload continuing and record No.s of overload automatically; 5 Display user's current load and record user's maximum load, switch off the power if overload and record the times of overload automatically; 6 Featuring with tamper and fraud proof by using unique card for each user; 7 Reading user ID number and accumulated energy consumption by using collection card; 8 Provided both photo-electric insulated impulse test output and LED test output; 9 Transmitting meter's data to collector via RS485 interface; 10 Three phase power supply designment, the meter can ensure the accuracy of measurement even if any one or two phases fail.