Mounting envelope and what to expect at the panel
At 6.80 kgs the drive drops into the same ACS550-U1 footprint family, so an existing backplate pattern and gland plate cut-out carry across without rework on a like-for-like replacement. The two natural peers on the same 6.80 kg envelope are the ACH580-01-014A-4 and ACH580-01-023A-4 — ABB's current-generation successor family for the ACS550 line, same mass so the cabinet loading calculation does not change. Terminal pitch and strip length are not on the spec row; confirm against the ABB ACS550-U1 installation drawing before terminating.
What changes (and what does not) against the higher-current ACS550
The closer second-source on this size is the ACH580-01 series, where 014A-4 and 023A-4 share the 6.80 kg envelope — that is the ABB migration direction for the ACS550 platform, but parameter set and fieldbus cards are not identical, so a firmware and macro port goes with the swap.
Sourcing posture and what to put on the RFQ
For an MRO spare, specify ACS550-U1-017A-6 verbatim on the PO; list ACH580-01-014A-4 or ACH580-01-023A-4 as alternates only when firmware re-mapping is in scope.