The ABB ACS310-03E-04A5-4 is a compact 4.0 Ampere, 1.1 kW (1.5 HP) variable frequency drive from the ACS310 series, which is specifically engineered for Pump and Fan control. It represents a significant upgrade in features and intelligence over the basic ACS150 series, offering superior energy efficiency and advanced application-specific functions in a similarly small package.