The Schneider Electric A9N18412 is an Acti9 C120H miniature circuit breaker (MCB) with a B tripping curve, rated 63 A at 30 °C, 2 poles, and a 15 kA Icn breaking capacity at 400 V AC.
Rated to dual standards EN/IEC 60898-1 and EN/IEC 60947-2, so it qualifies for both residential and industrial distribution panels. The 15 kA Icn at 400 V AC (per 60898-1) handles high-fault utility feeds; the 10 kA Icu at 440 V AC (per 60947-2) covers industrial motor-start transients.
Trip curve and application
B curve means magnetic trip between 3 and 5 times In (189–315 A for this 63 A unit). That suits resistive and general-purpose loads — lighting, small transformers, control circuits — where inrush is modest. Thermal-magnetic trip technology handles overloads (thermal bimetal) and short-circuits (solenoid) in one package.
IP20 finger-safe terminals accept 1–50 mm² rigid or 1.5–35 mm² flexible wire; tunnel-type terminals with a 3.5 N·m tightening torque and 15 mm strip length. Pollution degree 3 (conductive pollution) and overvoltage category IV suit main distribution boards.