The Schneider Electric A9F03250 is an Acti9 iC60N miniature circuit-breaker (MCB) rated 50 A, B curve, 2 poles. Breaking capacity is the headline: 36 kA Icu at 12–133 V AC, 20 kA at 220–240 V, 10 kA at 380–415 V, and 6 kA at 440 V (per IEC 60947-2). Under IEC 60898-1 it is rated 10 kA Icn at 400 V. That means this 50 A MCB can interrupt a 36 kA fault on a low-voltage secondary — useful on high-fault panels where a standard 10 kA breaker would need upstream fusing.
Mounts on DIN rail (EN 60715) — 36 mm wide (4 x 9 mm pitches). Wire strip length 14 mm, tightening torque 3.5 N·m. Thermal-magnetic trip unit with B curve: magnetic tripping limit 4 x In (±20 %), so it holds 200 A peak and trips on moderate overloads — typical for lighting, residential, and general-purpose distribution where inrush is low.