The A9F05416 is a Schneider Electric Acti9 iC60N miniature circuit-breaker, 4 poles, rated 16 A with a D curve. It's built for distribution panels where high inrush loads—motors, transformers, welding gear—need a magnetic trip threshold of 12 x In ±20 % so the breaker doesn't nuisance-trip on startup. Breaking capacity hits 36 kA Icu at 12–133 V AC (EN/IEC 60947-2) and 10 kA Icn at 400 V AC (EN/IEC 60898-1), giving solid fault-clearing headroom for most industrial and commercial mains.
The D curve (12 x In magnetic trip) is the key differentiator here—it's sized for loads that draw a brief, high surge on energization, like a 16 A motor or a bank of switched-mode supplies. The 16 A rating is the continuous thermal current (In), so the load should not exceed 16 A steady-state. Breaking capacity of 36 kA Icu at low voltage (12–133 V AC) and 10 kA Icn at 400 V AC means this breaker can safely interrupt a short-circuit fault up to those levels without welding contacts or cascading upstream—critical for selectivity studies in a distribution board. Dual-certified to EN/IEC 60947-2 (industrial) and EN/IEC 60898-1 (residential/commercial), so it's accepted in both worlds—panel builders often spec the 60947-2 rating for SCCR compliance, while the 60898-1 rating covers standard branch-circuit protection.
IP20 finger-safe front, but the busbar area is live when installed; isolate upstream before working on it. Trip indicator and contact-position indicator give visual confirmation of state without removing the cover.