The Schneider Electric A9F08150 is a 1-pole Acti9 iC60H miniature circuit breaker with a D tripping curve and a 50 A rated current. It's built for distribution boards and sub-panels where high inrush loads — motor starting, transformer energisation, or capacitive banks — demand a magnetic trip threshold of 12 x In (±20 %) to avoid nuisance tripping. The thermal-magnetic trip unit handles the overload side; the magnetic element clears short-circuits fast.
For industrial duty, the Icu per EN/IEC 60947-2 is 42 kA at 12–60 V AC, 30 kA at 100–133 V AC, and 15 kA at 220–240 V AC. On DC: 20 kA at 12–60 V DC, 15 kA at 60–72 V DC. The D curve's 12 x In magnetic trip ensures it won't drop out on motor start current, but still trips fast on a hard short.
Snaps onto a standard 35 mm DIN rail (EN 60715) and occupies 2 x 9 mm pitches (18 mm wide). Height is 91 mm, depth 78.5 mm — fits most distribution enclosures. Strip length 14 mm. IP20 rated — suitable for dry indoor panels only.