What lands on the panel
The ABB ACS800-ITT01-0030-3+E200+K458+L503 is an industrial motor drive from the ACS800 platform, built up with the +E200, +K458 and +L503 plus-code option set, and it sits in the motor-drives line under Motors & Motor Controls. Chassis mass is 6.35 kgs on the spec, so it is a two-hand lift at install — plan the cabinet mounting bracket and the swing-out clearance for that, not for a palm-sized module. The category trail (Motors & Motor Controls / Drives / Motor Drives) frames it as a wall- or cabinet-mount drive intended to command a low-voltage induction or permanent-magnet motor in an industrial panel.
Reading the option codes
Plus codes are how ABB orders the specific build of an ACS800 — +E200, +K458 and +L503 are stamped into the suffix and they govern the firmware, I/O and any factory-fit cards that ship on this chassis, so the same body code with a different suffix is not the same drive. When you quote a replacement, write the full suffix string out — copy the order code as it reads, including the plus signs, because the option set is what makes this build this build.
Second-source question: ACS880-01-07A6-5
The closest same-function cross-shop candidate is the ACS880-01-07A6-5, the next-generation successor in the ACS880-01 wall-mount family — both units record 6.35 kgs chassis mass and the same Motor Drives classification. Drop-in interchange is not a safe assumption just because the mass matches: the ACS880-01 control board, the assistant-panel connector, the fieldbus mapping and the parameter identifiers all change from ACS800 to ACS880, so the panel layout survives but the commissioning file does not.