LCD RECTANGLE,PRE-WIRED,WITH CT'S- 1 PHASE FOOL PROOF INSTALLATION The DDS28 static single-phase watt-hour meter measures active energy in single-phase three-wire alternating current power grids at rated frequency 60Hz and voltage 240V. The meter complies with the international standard IEC 61036 and the accuracy class is 1. Featuring high accuracy and reliability, it also prevents the illegal action of pilfering electricity. The reliability and service life of the meters have been greatly improved by adopting large-scale integration (LSI) and SMT as well as long-life key components of international brand. The meters have a solid structure that is suitable for household power consumption and long-life running.