The Schneider Electric A9N1P03CIN is a 1-pole miniature circuit breaker from the Acti9 xC60 series, rated 3 A with a C-curve trip characteristic. Breaking capacity is 10 kA Icu at 240 V AC, 15 kA at 12–48 V DC, and 6 kA at 60 V DC, all per IS/IEC 60947-2.
The 3 A C-curve is the key selection gate: C-curve trips magnetically at 5–10 x In (here 15–30 A), so it handles moderate inrush from small transformers, lighting ballasts, or control circuits without nuisance trips. The thermal-magnetic trip unit means bimetal for overload, solenoid for short — no electronics to drift. Overvoltage category IV means this breaker is rated for the mains supply entry point — it can handle the transient energy at the service entrance, not just downstream sub-panels. Suitability for isolation per IS/IEC 60947-2 means you can safely use it as a disconnecting means for the downstream circuit during maintenance, provided it's locked off.
Wire strip length is 13 mm for top or bottom connection. IP20 finger-safe terminals — fine inside a locked panel, not for wet locations.