Regulators in the DRM300 (Slave) and RGM300 (MasterSlave) range are three-phase multi-function power units, managed by a cutting-edge extended range micro processor (-40/85 °C), to control three-phase Vac voltage through an SCR phase capacity step system. DRM300 and RGM300 units are used in Air Conditioning, Refrigeration, Heating, Ventilation, De-stratification, Thermo-ventilation, Suction and air Treatment plants in general.