The Schneider Electric A9N3P25CIN is an Acti9 xC60 miniature circuit-breaker — 3-pole, 25 A rated current, C-curve trip characteristic. The C curve (magnetic trip at 8 x In ±20%) handles moderate inrush loads like small motor starters or lighting banks without nuisance tripping, while the 10 kA breaking capacity at 380–415 V AC (15 kA Icu at 100–125 V DC) means it can safely interrupt a hard fault on a distribution sub-panel without cascading upstream.
The body is 54 mm wide (6 x 9 mm pitches), 85 mm tall, 77.5 mm deep, so it occupies three adjacent 18 mm pole spaces in a distribution board. IP20 rated, so it's for inside an enclosure, not a washdown zone.