3-phase 4-wire energy meter with high accuracy is designed for the measurement of rated frequency 50 or 60Hz single-phase AC active electricity. High-quality flame retardant ABS case, with good impact resistance, heat/ cold resistance, insulativity and durability. With 6+2 digits backlight LCD display, the meter accurately counts and clearly displays the energy consumption. Adopts 35mm DIN standard guide rail installation, compact size and light weight make installation easier. Pure copper wiring terminal with excellent conductivity and resistance can large current during long-time performance. Display: LCD Display with Backlight Current: 3x20(80)A Voltage: 3x220/380V Accuracy Class: 1.0 Standard: IEC62053-21 Frequency: 50/ 60Hz Impulse Constant: 400imp/kWh Power Consumption: less than equal 2W Starting Current: 0.004lb Working Temperature: -20~55 Storage Temperature: -25~70 Material:ABS colour:transparent Package Contents: 1 * Energy Meter DTM024 1 * English instructions Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.