Peer comparison
The closest functional peer in the same ABB S280 family is the S273-K6A — a 3-pole version at the same 30 A rating. The S282UX-K is a 2-pole device, so it occupies two DIN modules instead of three and is the correct choice for single-phase or split-phase branch circuits where a neutral pole is not required. If your panel was originally wired for a 3-pole breaker, the S282UX-K will not drop in without rewiring the load side; the footprint is shorter by one module, but the busbar and load connections differ.