DDS43T-X type single-phase static watt-hour meter is a new type meter measuring single-phase alternating current active energy and it adopts special large-scale integrated circuit, high-performance CPU, as well as advanced surface mounting technology (SMT). Therefore, the meter is characterized with high accuracy, tamper-proof function, high anti-interference, long service life and so on. The meter is easy to operate and can meet the customers' requirements well for its reasonable design. All functions and technological specifications comply with the related provisions and technical requirements specified in IEC62053-21 and brought forward by electric power company of Hubei province. Technical data and function: * rated voltage: 220V * rated frequency: 50Hz * rated current: 2.5A, 5A, 10A, 15A, 20A * power consumption: < 1.0W, 6VA (adopt LCD) * relative humidity: 0~95% * constant: refer to the nameplate * energy register: 0~99999.9 kWh * operating temperature : -20 ℃ ~+55 ℃ * limit range of operation temperature: -25 ℃ ~+70 ℃ * Electromagnetic compatibility: Comply with the requirements of electrostatic discharge, electromagnetic HF-field, electrical fast transient burst pulse train and surge immunity specified in Standard GB/T 17626 * Infrared communication interface * Measure bi-direction active energy and accumulate in deliver direction * Under power failure, the data can be stored for more than 10 years * 6 digits LCD display, 5 integers and 1 decimal fraction