Feature: 1. Excellent long‑term reliability, small 3‑phase meter keeps light weight with perfect appearance, easy installation, etc. 2. Such kind of counter meter can directly measure the 50Hz active power consumption of the AC grid. 3. Imported large‑scale integrated circuits, advanced digital technology and SMT technology, etc. This meter has completely independent intellectual property rights and the smallest size. 4. Completely in line with the relevant technical requirements of the class 1 active energy meter specified by the international standard IEC62053‑21. 5. Insulation performance keeps that AC voltage 4kv for 1 minute, 1.2 / 50us waveform pulse voltage of 6kv. Specification: Item Type: 3-Phase meter Model: DTS1891 Product Material: Pure copper + plastic Voltage: 3 x 230V/400V Current: 3 x 5 (100) A Power: 400imp/kwh 50Hz Insulation Performance: AC voltage 4kv for 1 minute, 1.2 / 50us waveform pulse voltage 6kv Functions and Features: 1. 35mm standard DIN rail installation, in line with standard DIN EN50022. 2. Ten widths (modulus 12.5mm), in line with standard DIN43880. 3. Standard configuration 6 + 1 (999999.1kWh) LCD display. 4. Standard configuration of passive pulse output (polarity), long-distance passive pulse output (no polarity) can be selected. It also complies with IEC 62053-31 and DIN 43864 standards, making it easy to contact with various AMR systems. 5. Two LEDs indicate power status (green) and energy pulse signal (red). 6. Direction measurement of AC active power consumption. The direction in which the load current flows does not matter. Meet the standard IEC62053-21. 7. Direct connection operation, two types of wiring can be selected. The standard configuration is S-type wiring, but U-type wiring is possible. 8. Extend the terminal cover to protect the safety of use. Size: Approx. 88mm / 3.5in Approx. 63mm / 2.5in Approx. 125mm / 4.9in Approx. 35.5mm / 1.4in Approx. 5mm / 0.2in Approx. 44mm / 1.7in Approx. 68mm / 2.7in Approx. 45mm / 1.8in . Package List: 1 x 3-Phase Meter1 x User Manual