This is the breaker's continuous current rating — the load it can carry indefinitely without nuisance tripping at that ambient temperature. Above 40 °C, derate per the manufacturer's curve; the 80 A figure is your baseline for sizing in a typical enclosed panel. Mounts on a backplate with front connections top and bottom — compression lug or busbar. That's a standard panel footprint; plan for the 137 mm height and 80 mm depth when laying out gland plates and busbar runs.
Suitability for isolation is confirmed per that standard — meaning it provides a visible-break isolation function when open, meeting safety requirements for lockout/tagout. The grey RAL 7016 housing is the standard industrial finish across the ComPacT range.