The ABB ACS355-03E-12A5-4+B063 sits in the ACS355 family of three-phase motor drives, listed as a Drives line entry under Motors & Motor Controls. The code itself — ACS355-03E-12A5-4+B063 — is what a buyer puts on the BOM line; the +B063 suffix is an option-code tail on the same drive, so any substitution has to clear both the base part and that suffix before it can be released. On the desk it is a small-format drive. At 0.10 kgs it is a one-hand part; mounting is a panel-builder task rather than a rigging job, so the only mass that matters is whether the panel face has room behind the cutout, not whether a hoist is on site.
Where this class earns its keep
ACS355-class drives are the compact three-phase units typically dropped into machine-builder panels where a single motor needs independent speed control — conveyor sections, mixers, small pumps, fan stages — rather than a coordinated multi-drive cell. The point of the form factor is that the cabinet stays small and the fieldbus slice lives on top of the drive, not beside it, so the integrator is choosing an ACS355 when panel real estate is the constraint and the motor is the load.