What this drive is
The ABB ACS800-U4-0210-5+E210+K451 is a wall-mount AC drive in the ACS800-U4 frame, ordered with the +E210 and +K451 option suffixes that are part of the configured BOM line — those suffixes travel with the part number and should not be silently dropped on reorder. It sits in the Motors & Motor Controls › Drives › Motor Drives class, so the cabinet provisions to expect are standard VFD mounting, line-side fusing or breaker coordination, and motor-side cabling suited to a PWM output — not soft-starter or servo footprints.
Where it sits against same-class ABB drives
The ACS550-U1-157A-4 is the same-class peer most often cross-shopped for legacy ACS800 spares — both are wall-mount ABB industrial drives, and the listed weight is within roughly a kilogram (ACS550-U1-157A-4 at 89.81 kgs versus this unit at 90.72 kgs), so the cabinet footprint and rigging plan carry over closely; what does not carry over automatically is the parameter set, the option-suffix logic, and the control terminal layout, so a swap still needs a parameter dump and a wiring check, not just a physical lift-in. The current-generation ACS880-01-156A-5 and ACS580-01-180A-4 sit in the same current class but in substantially lighter enclosures — 55.00 kgs and 54.43 kgs respectively against this unit's 90.72 kgs — which is the kind of weight delta that signals a different mechanical frame and a re-evaluation of mounting, gland plate, and cooling clearances if modernization is on the table; treating them as like-for-like spares without checking the mechanical drawing is the kind of move that ends with the new drive sitting on the floor next to the old one.
Specifying it correctly
On the BOM line the full string ACS800-U4-0210-5+E210+K451 has to travel intact — the +E210 and +K451 suffixes are how ABB encodes the option set this drive was built and priced for, and reordering against the bare base code is a common source of a drive that arrives with the wrong firmware options enabled. For cabinet planning, the 90.72 kgs figure and the wall-mount form factor together dictate hoist access and door clearance during install; the electrical design side still needs the ABB ACS800-U4 manual for SCCR, line-side protection, and cable separation distances, none of which the order-code record carries.
Sourcing posture
This line is quoted to order against an RFQ with the full suffix string on it; that is the posture to take to procurement regardless of how the part is described elsewhere, and it is also the right framing for holding a verified spare alongside an installed ACS800 asset.