... , active power, reactive power, power factor, frequency, Kwh, 4 quadrant energy, etc. Total 28 elect DW9A/B ... current, active power, reactive power, power factor, frequency, Kwh, 4 quadrant energy, etc. Total 28 electrical parameters;2) ... , additional 1 line 8 digit to show the KWH separately;3) Two On-Off input / output, ... protocol);9) With power down memory function for KWH / KvarH. DW9A/B/C/D/E series ...