Functions: 1. The 35 mm DIN rail mounting meets the requirements of DIN EN50022. 2. The pole width of 17,5 mm meets DIN43880 standards. 3. Digital LCD display with backlight, no reset button to avoid human data manipulation. 4. Displays electricity, voltage, current, frequency and power. 5. Red LED energy pulse signal. 6. Built-in end cover for power security. 7. It is characterized by good reliability, small size, light weight, beautiful appearance and easy installation. 8. Adopt microelectronics and digital processing technology to measure electricity accurately and reliably. 9. Large-scale integrated circuits and precise SMT technology, with good resistance to electromagnetic interference and stable performance. Specification: Material: plastic Model: DDM15SD Accuracy: First Class Reference voltage: 220 V / 230 V 50/60 Hz Reference current (maximum current): 5 (80) A. Insulation properties: 1 min 4KV alternating voltage, 1,2/50us 6KV waveform pulse voltage Display: digital LCD display with backlight Installation: 35mm DIN rail Wiring method: up and down/up and down Power: 17000 W. Ambient temperature: -20 ℃ - and 50 ℃ Pole Width: 17,5 mm / 0,7 inch Functions: display of electricity, voltage, current, frequency, power factors Package Size: approx. 8,6 x 4,2 x 7,2 cm / 3,4 x 1,7 x 2,8 inch Weight: approx. 127,8g List of packages: 1 x energy meter There is NO reset function.