The Onset T-VER-8044-100 1-/3-Phase Veris AC Kilowatt Hour Transducer Sensor, 0 to 100 AMP incorporates three split-core AC current sensors and three voltage leads and outputs a signal proportional to kilowatts of power (demand). Accepting an input primary voltage of 480 Volts AC rms, this transducer requires a FlexSmart Analog Module. Because these sensors tie directly into the line, they should be used only by qualified personnel. NOTE: Not recommended for use with variable frequency drives.