The Schneider Electric A9F06350 is a 3-pole Acti9 iC60H miniature circuit breaker rated at 50 A with a B-curve trip characteristic. It protects branch circuits in distribution panels against overloads and short circuits, using a thermal-magnetic trip unit that responds to sustained overcurrents thermally and to instantaneous faults magnetically. Depth is 78.5 mm, which matters for enclosure depth planning when gland plates or busbar shrouds are tight. IP20 finger protection is standard for panel-internal use; no washdown rating here, so keep it behind the enclosure door.
This breaker carries a 42 kA Icu at 12-133 V AC — that's its ultimate short-circuit breaking capacity at the low-voltage end, typical for control transformer secondaries or 48 VAC circuits. At 220-240 V AC it's 30 kA Icu, and at 380-415 V AC it's 15 kA Icu. The takeaway: if your service entrance fault current exceeds 10 kA at 400 V, this breaker still clears it at its Icu rating, but it may not be reusable afterward — that's the difference between Icn (service continuity expected) and Icu (one-shot survival).
Standards and compliance — what the approvals certify
This MCB is certified to both EN/IEC 60947-2 (industrial application, category A — no intentional short-time delay) and EN/IEC 60898-1 (household and similar installation). Dual certification means it's accepted in both industrial control panels and commercial distribution boards across Europe and many other jurisdictions that adopt IEC standards. Overvoltage category IV confirms it's suitable for installation at the origin of the installation, before any step-down transformer.