ABB ACS320-03U-44A0-4 low voltage AC drives for HVAC, 1.2 to 50.8A. The ACS320 comes standard with four embedded communication protocols, including BACnet (MS/TP) for easy integration into building management systems. Built-in real time clock and timers help you optimize energy use. The drive provides full output current at ambient temperatures of up to 50°C without derating. The ACS320 drive is specifically designed to meet the variable torque loads demanded by centrifugal fans and pumps.