The Schneider Electric A9N3P10DIN is an Acti9 xC60 miniature circuit breaker rated 10 A with a D tripping curve, three protected poles, and a breaking capacity of 10 kA Inc at 380–415 V AC 50/60 Hz per IS/IEC 60947-2. Same part, different passport — this is the standard Indian-market variant (IS/IEC), but the hardware is identical to the European iC60N range. Genuine is genuine; the only difference is the standard marking on the nameplate.
D-curve trip and what it means on the line
The D curve magnetic trip is set at 12 x In ±20 %, meaning the instantaneous trip threshold is 120 A nominal. That deliberate gap above the C curve (5–10 x In) is sized for transformer inrush, motor starting, or welding equipment — loads that pull a short-duration surge well above running current without being a fault. For a 10 A MCB on a 3P distribution board feeding small motor groups or control transformers, this avoids nuisance trips on energisation.
The 54 mm width (9 mm pitch × 6) is the standard 3P MCB footprint — three modules wide. Depth 77.5 mm, height 85 mm. Biconnect bottom terminals allow daisy-chaining without separate distribution blocks. Tightening torque 2 N·m; strip length 13 mm.
Rated for isolation (suitability for isolation: Yes per IS/IEC 60947-2). Pollution degree 3, overvoltage category IV. IP20 finger-safe terminals. Relative humidity 95 % at 55 °C. The standard marking is IS/IEC 60947-2; the same hardware carries CE and UKCA for European markets — the nameplate differs, not the internals.