The A9F04640 is a 40 A, C-curve miniature circuit breaker from the Schneider Acti9 iC60N family, 1P+N. Magnetic tripping at 8 x In ±20%. Breaking capacity is where this breaker earns its keep: 36 kA Icu at 12-60 V AC, 20 kA at 100-133 V AC, and 10 kA at 220-240 V AC per EN/IEC 60947-2. For residential-style service at 230 V, it also carries a 6 kA Icn rating per EN/IEC 60898-1 — so it's dual-rated for both industrial (60947-2) and domestic (60898-1) applications.
That 78.5 mm depth is worth checking if you're fitting it into a shallow enclosure — it's deeper than some compact MCBs, so leave room for wiring and the toggle throw. If you're putting this in a washdown area, it needs an enclosure. The trip indicator gives a visual flag on the toggle — handy for a maintenance tech walking the line to spot which breaker tripped without poking at each one.
Current-production part. The Acti9 iC60N line is Schneider's standard distribution MCB, widely stocked and specified globally.