Main Features: 1. Measuring instantaneous voltage, current, power and frequency of three phases; 2. Record function of voltage-loss (phase failure), current-loss, voltage eligible rate, electric break and restore, programming, maximum demand reset, broadcast time synchronization and so on; 3. Measuring positive and negative active energy against each time segment; Measuring positive and negative reactive energy against each time segment (time of use) and measuring methods can be set; reactive energy measurement of 4 quadrants; measuring accumulated energy of each phases (optional); 4. Maximum Demand measurement of positive active/reactive, negative active/reactive with different segment; 5. Ability of programming 4 tariffs, 16 day tables, 4 time zone and 12 public holiday tables; 6. Self-detecting, warning alarm provided, online detecting important components and the meter's running status; 7. Scroll-display parameters (no more than 32 items), interval time and order can be set as required; 8. Active and reactive impulse test output port, positive/negative active and reactive remote impulse output ports; 9. Synchronous output second signal (optional) for detect the accuracy of the set-inside clock; adopt photo-electric insulated output method; 10.Built-in RTC clock, broadcast time synchronization via RS485 communication interface; 11.The permission of meter parameterization or data clearing is controlled by authorized person with authorized password as well as the status of sealed switch on the meter; 12.Going to sleep-mode while electric break; it can be waked up by pressing Button or infrared HHU, infrared meter reading is possible during electric break; 13.Convenient replacement of the battery without removing the upper cover (broken seal); 14.Provided with 2 RS485 port (optional) and 1 optical port; it can transfer data from or to meter via 2 RS485 ports and optical port in the meantime by using PCs and HHU; 15.Provided with fault alarm and load trip output; 16.Optional function: Electric current detecting while electric break, energy consumption store at certain time, day load table, load curve (load profile), etc.