The 3AXD50000454075: The 250 A heavy-duty (HD) rating governs continuous motor load for most pump and fan profiles. The 271 A light-overload (LO) figure gives headroom for variable-torque applications where the drive can run above rated current for short periods. Both are UL-listed.
The R9 frame is the physical footprint; plan gland plate entry and clearance for the heatsink airflow accordingly.
