The Schneider Electric A9F04140 is a 1-pole Acti9 iC60N miniature circuit breaker rated at 40 A with a C-curve trip characteristic.
Under the industrial standard (60947-2), the ultimate breaking capacity (Icu) is 10 kA at 220–240 V AC, 36 kA at 12–60 V AC, and 20 kA at 100–133 V AC. For DC circuits, it delivers 15 kA at 12–60 V DC and 10 kA at 60–72 V DC. Under the residential/light-commercial standard (60898-1), the rated short-circuit capacity (Icn) is 6 kA at 230 V AC. This dual rating means the breaker is suitable for both industrial distribution panels requiring high fault interruption and general-purpose final subcircuits. The C-curve (magnetic trip at 8 x In ±20%) is the standard choice for inductive loads like small motors, lighting ballasts, and transformers where inrush current is moderate. For a 40 A rating, the magnetic trip threshold is approximately 320 A, which avoids nuisance tripping on startup while clearing hard faults.
Panel integration
The 18 mm width (2 x 9 mm pitches) and 78.5 mm depth fit standard DIN-rail enclosures with minimal overhang. The IP20 finger-safe terminals accept rigid conductors up to 35 mm² or flexible up to 25 mm², with a stripping length of 14 mm and a tightening torque of 3.5 N.m. The toggle control and trip indicator provide local status at a glance. Pollution degree 3 rating means it tolerates conductive pollution in industrial environments, and tropicalisation class 2 (per IEC 60068-1) covers humidity up to 95% at 55°C.
Rated insulation voltage (Ui) is 500 V AC, and overvoltage category IV means it can be installed at the service entrance or main distribution board.