... three phase four wire active energy measuring. DIN rail installation type, compact design. Display type: mechanical counter, unit is kwh, record active ... :Total energy= positive active+negative activePhase failure indicate function for A/B/C phase voltage Display function even ... frequency:50Hz, 60HzStarting current: 0.004IbConnection type choice: three phase four wires, up in down out,L1,L1,L2,L2 ...