... IEC1107, IEC687 & IEC1268. Three-phase Multi-function Static Energy MeterDTDS3/DSSD2 three phase multi-function energy is the new generation intelligent ... adopting the advanced technology. The products have the characteristics of high accuracy, good stability, strong function, conbenient operation, etc, ... of IEC1036, IEC1107, IEC687&IEC1268. DTSD3/DSSD2 Three-phase Multi-function Static Energy Meter