3 - Phase Power Network Meter; Harmonic up to 51st; Display: 4 x 4(1/2) LED Digit with 14 mm Digit Height (Red or Green Colour); Input: Voltage (100V or 400V or 690V); Current (1A or 5A) - Ratio Programmable; 1 Pulse Input; Output: 1 Analog 3 Relays 1 Pulse.