135mm standard DIN rail installation , complying with standard DIN EN50022. 2Ten pole width (Modulus 12.5mm), complying with standard JB/T7121-1993. 3Seven digits display LCD, 6+1 digits display (999999.1 kWh) . 4There are a polarity port of pulse output passive closed and a nonpolarity port of pulse output passive distant . Complying with standard IEC 62053-31 and DIN 43864. 55 LED instructions respectively every power supply state, signal of closed energy impulse and distant energy impulse and data communication state. Features:35mm standard DIN rail installation , complying with standard DIN EN50022. Ten pole width (Modulus 12.5mm), complying with standard JB/T7121-1993.Type S wiring (Type U).Seven digits display LCD, 6+1 digits display (999999.1 kWh) .There are a polarity port of pulse output passive closed and a nonpolarity port of pulse output passive distant . Complying with standard IEC 62053-31 and DIN 43864.5 LED instructions respectively every power supply state, signal of closed energy impulse and distant energy impulse and data communication state.Automatic detection the direction of the flow of load current. And Instructions on individual LCDSingle direction three components measure three phase four wire active energy consumption. It is nothing with direction of the flow of load current. Complying with standard IEC 62053-21.Standard configuration short terminals cover, may select extension terminals cover, in order to protect to use safety. Specifications:Model: XTM1250SA-UAccuracy: Class 1Voltage: 3x220V/380VCurrent: 5(30)A,15(60)A, 20(80)A,10(40)A, 30(100)A (Optional)Insulation performance: AC voltage 4kv for 1 minute,1.2/50us waveform impulse voltage 6kvSize: as the pictureWeight: 498gPackage included:1 x DIN-Rail Electric Meter1 x Manual