What the order code lands on
The ABB ACS880-01-077A-5+P944 is a wall-mount industrial drive from the ACS880-01 single-drive family, with a 3-phase 380-500 V input as stated in the listing title and description. It sits in the Drives / Motor Drives line, which is the right class to confirm before any panel-fit or substitution decision. Chassis mass is 23.13 kg, so plan for wall-mount handling and lift support before the unit goes on the wall.
Frame fit against the next step down
The closest same-function sibling is the ACS880-01-065A-5; both list 23.13 kg, which is the cleanest evidence they share the ACS880-01 enclosure and mounting pattern. That shared envelope is what matters for retrofit: a panel laid out around the 065A will accept the 077A on the same mounting pattern, with the only real engineering difference being the current headroom step up the ladder. Further down the same ladder, the ACS880-01-040A-5 weighs 18.14 kg and the ACS880-01-034A-5 weighs 10.43 kg — scale references placing the 077A at the heavier end of the wall-mount range.