The ABB S802U-K40 is a 2-pole K-curve miniature circuit breaker from the S800 series, rated at 40 A. The K-curve trips between 10 and 14 times rated current, making it suited for motor and inductive load circuits where moderate inrush is expected without nuisance tripping on start-up.
Snap-on mounting to DIN rail per EN 60715. The S800 family uses a modular 17.5 mm per-pole width, so this 2-pole unit occupies 35 mm of rail space — fits standard panel layouts without adapters.