ABB ACH550-UH-03A3-4 Variable Frequency Drive

ABB ACH550-UH-03A3-4 is a compact three-phase variable frequency drive designed to control small-to-mid-size motors on 380–480 VAC power, delivering 3.3 A nominal output. With a base drive rating of 2 HP at 460 VAC, the -03A3-4 variant provides a practical power band for HVAC fans and small pumps, as well as other light-industrial machinery that requires reliable speed control. This model is part of ABB's ACH550 family, a line of low-voltage drives optimized for straightforward configuration and dependable operation in commercial environments; ABB's conversion guide confirms the -03A3-4 designation within the 380–480 VAC three-phase offerings. Examples of typical applications include regulating air-handling unit fans, circulating pumps, and other 3-phase equipment where precise motor speed control and compatibility with standard control systems are important.