True power monitoring suitable for 1- and 3-phase supplies for frequency-controlled motors, 9 measuring ranges 0 – 1000 Hz, measuringvoltage 0 – 550 V AC/DC, 1 changeover contact, 1 analogue output 0 – 10 V DC or 4 -20 mA, width = 22.5 mm, UB = 110 – 230 V AC/DC.