Reading the plus-options
The ACS800-U1-0004-5+N661+P901: The +N661 and +P901 suffixes are factory-fitted option codes that change what ships with the drive rather than re-rating it — control board variant, I/O or fieldbus adaptation, or a language/package option are the usual N6xx / P9xx roles on an ACS800-U1 build. The base code ACS800-U1-0004-5 carries the frame and voltage class; the plus-options layer onto that, so substitution or repair has to match the full string, not just the base.
Where it sits in the panel
Listed mass is 5.44 kgs — relevant to the panel wireman's mounting and lift handling, not a selection criterion. The U1 frame is sized for cabinet or through-wall mounting; weight at this level is a one-person lift but the cabinet layout still has to clear the drive's footprint and keep the required clearance for airflow around the heatsink.
Sourcing posture
No lifecycle or production-status entry is on record for the seed code, so production posture is left unstated. The line is quoted against an RFQ with the full plus-option string carried into the order to match the BOM.