SPECIFICATION:Used for AC three phase four wire active energy measuring. DIN rail installation type, compact ... )A,Reference frequency:50Hz, 60HzStarting current: 0.004IbConnection type choice: three phase four wires, down in down out,L1,L1,L2,L2 ... constant:1600imp/kWhStandard level:1.0class,2.0classPower consumption of meter: