The Schneider Electric A9N2P40CIN is a 40 A, C-curve, 2-pole miniature circuit breaker from the Acti9 xC60 series. The thermal-magnetic trip unit gives you a magnetic tripping limit of 8 x In ±20% — meaning the magnetic coil picks up around 320 A for a fast short-circuit break.
Breaking capacity — what the 10 kA rating means in practice
The A9N2P40CIN carries a breaking capacity of 10 kA Icn at 380–415 V AC, certified to IS/IEC 60947-2. On the DC side it's rated 6 kA Icu at 100–125 V DC. Below that, on downstream sub-circuits, it has headroom.
Where it fits — panel integration and environment
The breaker occupies 36 mm width (4 x 9 mm pitches) on a 35 mm DIN rail, with a depth of 77.5 mm and height of 85 mm. That's a standard 2-module footprint — it leaves room for a separate earth-leakage block downstream if you need RCD protection. The clip-on mounting means no screws or tools to install it; just snap it onto the rail and wire it. Pollution degree 3 means it's tested for conductive dust and occasional condensation, typical of industrial control rooms and factory floors.