The ABB 3AUD0000004271 is an HVAC packaged drive from the ACH580 series, integrating an e-clipse bypass and a circuit breaker disconnect in a single NEMA Type 3R enclosure. It is UL listed for light-overload use at 75 Hp and 77 A output, on a 500 to 600 V three-phase supply at 50/60 Hz.
The 75 Hp light-overload rating at 77 A defines the continuous motor capacity this drive can support under typical HVAC fan and pump duty. Light-overload (UL) means it delivers that current without derating for variable-torque loads — the common case for centrifugal fans and pumps where starting torque is low. The 500 to 600 V input range covers 480 V and 575 V nominal systems common in North American industrial and commercial installations. NEMA Type 3R enclosure means the drive is rated for outdoor installation — rain-tight and sleet-resistant, but not submersible.