The MGN25085 is a 1-pole C60H miniature circuit breaker from the Multi9 range, rated 10 A at 50 °C per EN/IEC 60947-2. The 15 kA Icu at 240 V AC phase-to-neutral is the maximum fault current it can safely interrupt; the Ics (service breaking capacity) is 7.5 kA at the same voltage, which is 50 % of Icu and tells you it can be reclosed after a fault at that level without immediate replacement. At 415 V AC the Icu drops to 4 kA and Ics to 2 kA — if your panel feeds a 400 V line-to-line circuit, this breaker is not the right choice; you need a higher-rated C60H variant or a different frame.
The single-pole module occupies 18 mm (2 x 9 mm pitches) — standard width, no surprises in a populated enclosure. IP20 rated, so it is for dry indoor panels only, not washdown areas.