EM3-DIN is a three-phase energy meter for the measure of active or reactive energy. The 208VL-L, 220VL-L and 400VL-L meters are self-sup-plied, while the 660VL-L meters are provided with auxiliary power supply. EM3-DIN is provided with: 6+1DGT electromechanical indicator for the indication of kWh or kvarh; one green LED for the indication of power ON; one red LED blinking proportionally to the consumed energy.