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 prevent unauthorized data adjustment. 4. Displays energy, voltage, current, frequency, and power. 5. Red LED energy pulse indicator. 6. Built-in end cover for electrical safety. 7. Features high reliability, compact size, lightweight design, attractive appearance, and easy installation. 8. Utilizes microelectronics and digital processing technology for accurate and reliable energy measurement. 9. Equipped with large-scale integrated circuits and precision SMT technology, offering strong electromagnetic interference resistance and stable performance. Specifications: Material: Plastic Model: DDM15SD Accuracy: Class 1 Reference Voltage: 220 V / 230 V, 50/60 Hz Reference Current (Maximum Current): 5 (80) A Insulation Properties: 1 min 4 kV AC voltage, 1.2/50 μs 6 kV impulse voltage Display: Digital LCD with backlight Installation: 35 mm DIN rail Wiring Method: Top and bottom connection Power Rating: 17000 W Ambient Temperature: -20 °C to +50 °C Pole Width: 17.5 mm / 0.7 inch Functions: Energy, voltage, current, frequency, and power factor display Package Dimensions: Approx. 8.6 x 4.2 x 7.2 cm / 3.4 x 1.7 x 2.8 inch Weight: Approx. 127.8 g Package List: 1 x Energy Meter Note: This device does not have a reset function.