Features 35mm standard DIN rail installation, complying with standard DIN EN50022 Six pole width (Modulus 12.5mm), complying with standard JB/T7121-1993. May select 5+1LCD digits display (99999.1kWh) . Standard configuration short terminals cover, may select extension terminals cover, in order to protect to use safely. Single direction measure single phase two wire active energy consumption. It is nothing with direction of the flow of load current. Complying with standard IEC 62053-21. Features: 35mm standard DIN rail installation, complying with standard DIN EN50022. Six pole width (Modulus 12.5mm), complying with standard JB/T7121-1993. May select 5+1LCD digits display (99999.1kWh) . Standard configuration one port of pulse output passive (polarity), May select increase  a distant port of pulse output passive (nonpolarity), complying with standard IEC 62053-31 Standard configuration don't detection direction of the flow of load current. May select automatic detection the direction of the flow of load current. And instructions by an individual LED. Single direction measure single phase two 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 safely. Specifications: Model: XTM75S-U Accuracy: Class 1 Voltage: 220V Current: 5(30)A,15(60)A, 20(80)A ( Optional) Insulation performance: AC voltage 4kv for 1 minute,1.2/50us waveform impulse voltage 6kv Size: 10 x 7.6cm / 3.94 x 2.99in Weight: Approx. 270-277g Package included: 1 x  DIN-Rail Electric Meter 1 x Manual Package List