What this order code is
The ABB ACS355-03U-17A6-2+J400 is a general-purpose micro drive in the ACS355 family, sold under the ASEA BROWN BOVERI brand line, with the 3-phase input class carried by the order code and the +J400 option appended to the base part number. It sits in the Motor Drives sub-category — Drives under Motors & Motor Controls — so it is the wall-/cabinet-mount class rather than a field-mount or integrated servo.
What the ratings actually tell the buyer
The three-phase input band on the order code names the supply class this drive expects on its line terminals; specifying it onto a different voltage class or single-phase feed is a fault before commissioning, not a tuning problem. The 17A6 current frame (the digits after the dash) is the continuous output rating around which motor pairing, branch protection and SCCR headroom get sized — the input voltage band and the current frame are the two numbers a panel builder needs before ordering cable and fuses. At 1.36 kgs the unit is a one-hand lift for a panel builder and does not require a reinforced mounting surface; thermal design in a sealed cabinet still follows the drive's own derating curve rather than mass. The +J400 option suffix is a factory-installed option bundle that ships as one line item; option-letter combinations on ACS-series drives are not field-recombined, so any replacement order needs the suffix carried through verbatim.
Where the ACS355 class is used
The ACS355 line is the ABB micro-drive tier used for variable-torque and constant-torque loads — conveyors, fans, pumps, mixers and small hoists — where a compact cabinet-mount unit with simple scalar/VHz control is enough.
ABB ACS310 — same family, different job
The ACS310-03U-02A6-4 and ACS310-03U-06A2-4 share the 1.36 kgs macro-drive weight and the same Motor Drives placement, but they live in the ACS310 family aimed at pump/fan duty, not the ACS355 general-purpose tier — they are not a verbatim cross, and substituting them into an ACS355 BOM line means revisiting parameters, macros and the option-suffix stack. The ACS310-03U-08A3-2 carries the same three-phase input class as the listed drive and a marginally higher 1.41 kgs mass; the relevant question is not weight but whether the ACS310 firmware macros cover the load profile the ACS355 was specified for.
Sourcing posture
The ACS355-03U-17A6-2+J400 ships through the ABB ACS355 distribution channel with the +J400 option pre-applied at the factory; orders are quoted against an RFQ on the full MPN including the suffix, and pricing varies with option content rather than just current frame.