The DD862 single phase meter is designed to meet the latest IEC 521. With accuracy of class 2, it measures active energy in single-phase two-wire or three-wire alternating power grids. Connection is direct or by instrument transformers. It is a reliable long service life meter. The average service life (MTTF) is 10 years and the maximal overload capacity is 667%Ib. The specifications of the meter can be tailored to customer requirements.