Small size, light weight and beautiful appearance Good reliability and easy installation 35mm standard DIN rail mounting, in accordance with standard DIN EN50022. Single pole width (modulus 18mm) in accordance with DIN43880. The standard configuration 5+1 backlight LCD display (99999.1KWh) Features: 1. RS485 (communication protocol Modbus-RTU) remote meter reading function. 2. Display and reading: electricity, current, voltage, frequency, power factor 3. Standard configuration output passive (polarity), select remote output passive (non-). It is easy to contact with various and conforms to the standards IEC 62053-31 and DIN43864. 4. Double color LED indicates the power status (green) and the energy signal (red). 5. Automatically detect the flow direction and of the load current 6. One-way measurement of single-phase two-wire active power. 7. Direct S type connection 8. Extend the terminal cover to the use. Specification: Condition: Model: DDM18SD Voltage Specification: 220V Frequency: 50Hz Current Specifications: 5(100)A Communication : RS485 Screen Display: Multi-function Display Accuracy Level: 1.0 Working Temperature: -10 Celsius- +50 Celsius Installation : DIN Rail Mounting Communication protocol: MODBUS-RTU, DL/T645-1997, DL/T645-2007 (optional) Weight: . 102g / 3.6oz Colour:white Material:plastic Package Contents: 1 * DDM18SD Energy Meter 2 * Shell Accessories 1 * manual Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.