The SDM630Modbus measures and displays the characteristics of single phase two wires(1p2w) , three phase three wires(3p3w,) and three phase four wires(3p4w) supplies, including voltage, frequency, current, ,active and reactive energy, imported or exported. Energy is measured in terms of kWh, kVArh.Maximum demand current can be measured over preset periods of up to 60 minutes. In order to measure energy,the unit requires voltage and current inputs in addition to the supply required to the product.SDM630Mbus supports max. 100A direct connection,saves the cost and avoid the to external ,giving the unit a cost-effective and easy operation.-in interfaces provides and Mbus outputs.Configuration is password .Measures kWh Kvarh, KW, Kvar, KVA, PF, Hz, , V, A, etc.Bi-directional measurement IMP & EXPDin rail mounting 35mmVoltage AC (Un): 230/400VBase Current (Ib): 10AMax. Current (): 100AMini Current (Imin): 0.5AStarting current: 0.4% of Ib consumption: Less than 2W/10VAFrequency: 50/60Hz(10%)AC voltage withstand: 4KV for 1 Impulse voltage withstand: 6KV-1.2uS wavformOvercurrent withstand: 30Imax for 0.01s output rate: 1000imp/kWh (default), 100/10/1 imp/kWh/kVarh (configurable)Display: LCD with blue backlight. Max. Reading999999.99kWhcolor:As shownMaterial:plasticPackage Contents:1 x Three Phase Energy MeterOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.