The Schneider Electric A9F08310 is an Acti9 iC60H miniature circuit breaker — D curve, 10 A, 3-pole, thermal-magnetic trip. It's a current-production part, still actively manufactured and available through distribution. Rated 42 kA Icu at 12–133 V AC, 30 kA at 220–240 V, 15 kA at 380–415 V, and 10 kA at 440 V AC per EN/IEC 60947-2. Also carries a 15 kA Icn at 400 V per EN/IEC 60898-1. That dual-standard rating means it's certified for both industrial (60947-2) and residential/commercial (60898-1) installations — useful if the panel crosses jurisdictions or the spec calls for either standard. D curve with magnetic tripping at 12 x In ±20% — so it holds through motor inrush and transformer energization without nuisance trips. The 10 A rating handles lighting, control transformers, and smaller motor branch circuits. Thermal-magnetic element gives short-circuit plus overload protection in one package.
Snaps onto DIN rail, 6 x 9 mm pitch modules wide (54 mm). Depth 78.5 mm, height 91 mm. That footprint fits standard distribution boards and subpanels — no oddball dimensions to fight. Double terminals top and bottom accept 1–25 mm² rigid or 1–16 mm² flexible; torque to 2 N·m. Wire strip length 14 mm. IP20 finger-safe front, pollution degree 3 rated. Overvoltage category IV — suitable for main incoming panels, not just sub-distribution.
Suitability for isolation is confirmed under both standards — it's a legitimate disconnecting means. Separate earth-leakage block available if you need RCD integration downstream.