Applications: DTSF870 3-phase electronic multi-rate kilowatt-hour meter is a kind of electric measuring meter, which adopts special compositive circuit and new technology of micro-electronics with SMT technic to manufacture. The meter measuring part adopts SA9105 chip, throughout to collect loop signal from DC and AC current,conversion from electric power value to correspond of electric power pulse signal, controling chip to accord to customer programmed period of time, taking different time period power pulse register into correspond rate, and complete display and communication function, so that realize the multi-rate power measuring function. Technical parameters: 1) Rated voltage: 3 x 220V/380V, 50Hz/60Hz 2) Specifications: 3 x 1.5(6)A, 3 x 5(20)A, 3 x 10(40)A, 3 x 15(60)A, 3 x 20(80)A,3 x 30(100)A 3) Accuracy: Class1 4) Working temperature range: -25 - 55癈 5) Power loss: ≤2.0W 6) Starting current: ≤0.004Ib 7) Day time error: ≤0.5s/d 8) After power stop, the batteries keep ≥10 years 9) Period of time switch error: ≤1min 10) Executive standards: GB/T17215-2002, GB/T15284-2002, and DL/T645-1997