What lands in the cabinet
The ABB ACS800-704-0910-7 is a 6/12-pulse diode supply unit in the ACS800 family, built as a chassis-mount, 3-phase rectifier block rated at 960 A across a 400 - 690 V AC range and packaged in a Frame D4 enclosure. It is not an inverter; it is the line-side DC feed that sits ahead of the matching ACS800 inverter modules in a multi-pulse drive stack.
Reading the headline ratings
The 960 A current figure is the diode bridge's continuous DC-side rating and is the number that governs upstream fuse and cable sizing for this Frame D4 unit, not a motor output current. The 400 - 690 V AC range covers the standard ABB low-voltage drive mains windows on 400, 500 and 690 V supplies, so the same order code is specified into installations regardless of which of those three mains levels the cabinet is fed from. The 503 kW figure carried in the title string reflects the diode supply unit's class rating at the listed mains levels; it is the rating that the cabinet builder works back from when sizing the inverter stage downstream and the cooling arrangement around Frame D4. Mounting is chassis only, so the unit is intended for fixed cubicle build rather than wall or DIN-rail integration.
Procurement posture
Specify the ABB ACS800-704-0910-7 into the BOM by its full order code with the 960 A, 400 - 690 V AC and Frame D4 references called out on the purchase document, so the line item is unambiguous against the ACS800 family. The unit is sourced to order against an RFQ rather than off the shelf; the relevant decision for the buyer is confirming that the cabinet is being built around a 6/12-pulse ACS800 supply stage of this current class, not a different supply topology from the same family.