1、35mm standard DIN rail installation , complying with standard DIN EN50022. 2、Ten pole width (Modulus 12.5mm), complying with standard JB/T7121-1993. 3、Seven digits display LCD, 6+1 digits display (999999.1 kWh) . 4、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、5 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 LCD Single 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-U Accuracy: Class 1 Size: as the picture Weight: 498g Package included: 1 x  DIN-Rail Electric Meter 1 x Manual