What this drive delivers
The ABB 3AUD0000001811 is a 3-phase HVAC drive with an integrated disconnect, rated for light-overload use at 300 Hp (361 A) on a 460 V supply per UL. The 380...480 V input range covers standard North American and 400 V class industrial feeds. Frame R9 tells you the physical footprint — this is a large-drive chassis, not a panel-mount compact unit. NEMA Type 1 enclosure means it is ventilated for indoor installation; IP21 adds drip protection but does not tolerate washdown. The integrated disconnect simplifies compliance with local lockout/tagout requirements — one less external safety switch to spec.
The 361 A output at 460 V is the light-overload rating — the drive can deliver that continuously for variable-torque HVAC loads like fans and centrifugal pumps. That is the figure that governs the motor branch circuit sizing, not the drive's peak rating. Frame R9 carries specific mounting-hole patterns and conduit entry locations; if you are swapping into an existing installation, verify the footprint matches the old drive's mounting plate.