Three Phase 4 Wire Digital Kwh Energy Meter, type three-phase four wire electronic multifunction Meter machine, is a new type of multi-function meter.Three phase digits frequency power meter is according with the correlative standard, rules of the nation , has the function as high-accuracy, well stability, advanced technology and easy operation. The performance index of the Three Phase 4 Wire Digital Kwh Energy Meter accord with the technical requirements of nation standard, such as GB/T 17215.321 -2008 Class I and 2 Static A.C Active Watt-hour Meter, GB/T 17215.322-2008 Class 0.2S and 0.5S Static A.C Reactive Watt-hour Meter, GB/T 17215.323-2008 Class 2 and 3 Static A.C Reactive Watt-hour Meter and DL/T 614-1 997 Multi-function Watt-hour Meter the communication agreement accord with DL/T 645-1 997.