1. Measuring of active energy , accuracy class B&A (CI.1&2 ) 2. 7 Din module 3. 35mm standard DIN rail installation 4. Direct metering up to 100A 5. 5A CT version for mearuring with current transformers available 6. 27 CT changing-ratios to change 7. M-bus interface built-in 8. Communication baud rate can be set 300 , 2400 , 9600 9. The protocol is based on international standard EN13757-3:2004 , EN1434-3:2007