The A9N3P03CIN is a 3-pole miniature circuit breaker from the Schneider Electric Acti9 xC60 series, rated 3 A with a C-curve trip characteristic. The 10 kA breaking capacity at 380–415 V AC (IS/IEC 60947-2) tells you it can safely interrupt a fault current up to 10 kA at that voltage — enough for most commercial and light industrial distribution boards. The 15 kA Icu at 100–125 V DC extends its use into DC circuits, though the AC rating is the primary spec for panel builders. The 54 mm width for three poles is compact — six 9 mm pitches per the spec — so it fits tightly in a crowded DIN rail assembly. IP20 finger protection is standard for enclosed distribution boards; no washdown rating here, so keep it behind a panel door.
The suitability-for-isolation marking confirms it can be used as a disconnecting means per IS/IEC 60947-2. Compliance documentation (RoHS, REACH, UL) is typically available from Schneider's product certification portal; the evidence does not list specific certs beyond the IEC standard.