The MGN25112 is a Schneider Electric C60H miniature circuit breaker from the Multi9 range — a 2-pole, D-curve unit rated 3 A, built for distribution duty in 35 mm DIN-rail enclosures. Breaking capacity hits 30 kA Icu at 240 V AC phase-to-phase (15 kA at 415 V, 10 kA at 440 V), which puts it in the C60H tier — high enough for most commercial and light-industrial panelboards where fault current runs under 30 kA.
The 3 A rating is at 50 °C per EN/IEC 60947-2, so no derating is needed at typical panel ambient; above that, the thermal-magnetic trip element adjusts naturally. Service breaking capacity (Ics) is 50 % of Icu — 15 kA at 240 V, 7.5 kA at 415 V, 5 kA at 440 V — meaning after clearing a fault at that level the breaker remains functional, not just safe.
Snaps onto 35 mm symmetrical DIN rail (EN/IEC 60947-2), occupies 4 x 9 mm pitches (36 mm wide) — two-pole width, standard for a 2P MCB in a Multi9 lineup. IP20 finger-safe front; pollution degree 3 per EN/IEC 60947-2, so it's rated for the conductive-dust environment inside a typical panel.