Features: 35mm standard DIN- rail installation, complying with standard DIN EN50022. Bipolar width (Modulus 17.5mm), complying with standard DIN43880. Standard configuration 7+1 digits display (9999999.1kWh) by blue backlight source LCD. May select 7+1 digits display (999999.1kWh) without backlight source general LCD. Standard configuration pulse output passive (polarity), May select distant pulse output passive ( nonpolarity). And contact with all kind of AMR system conveniently, Complying with standard IEC 62053-31 and DIN 43864. Two LED instructions power supply state and signal of energy impulse Automatic detection the direction of the flow of load current. And instructions on LCD (when display HELP 1 on LCD, that is meaning the direction of the flow of load current reverse). Single direction measurement single phase two wire active energy consumption. It is nothing with direction of the flow of load current. Complying with standard IEC 62053-21. Extension terminals cover, in order to use safely Specifications: Model: XTM35SA Accuracy: Class 1 Voltage: 220V Current: 5(30)A, 20(80)A (Optional) Insulation performance: AC voltage 4kv for 1 minute,1.2/50us waveform impulse voltage 6kv Size: 17 x 7cm / 6.7 x 2.8in Weight: 176g Package included: 1 x DIN-Rail Electric Meter 1 x Manual 1、35mm standard DIN- rail installation,complying with standard DIN EN50022. 2、Bipolar width (Modulus 17.5mm), complying with standard DIN43880. 3、Standard configuration 7+1 digits display (9999999.1kWh) by blue backlight source LCD. May select 7+1 digits display (999999.1kWh) without backlight source general LCD. 4、Standard configuration pulse output passive (polarity)，May select distant pulse output passive ( nonpolarity). And contact with all kind of AMR system conveniently，Complying with standard IEC 62053-31 and DIN 43864. 5、Two LED instructions power supply state and signal of energy impulse