... DDS877 , DDS48 type electronic single phase energy meterApplication : DDS877 , DDS48 type electronic single phase energy meter is the most advanced static electronic meter in China ... circuit, high reliability step motor, it can meter the AC single-phase active energy (voltage rating: 220V; frequency 50Hz), positive and negative ... 5(20),10(40),15(60),20(80),30(100) single phase electronic energy meter