The Schneider Electric A9P44740 is an Acti9 iC40N miniature circuit breaker rated 40 A, 3P+N, B curve, with a 10 kA Icu breaking capacity at 400 V AC per IEC 60947-2 and 6000 A Icn per IEC 60898-1.
Breaking capacity and standard compliance
The 6000 A Icn (IEC 60898-1) is the rated short-circuit capacity for the domestic-standard test sequence. Dual-rated to both standards means this MCB qualifies for either a residential consumer unit (EN 60898-1) or an industrial panel (EN 60947-2) without a separate part number.
B-curve trip characteristic
The B curve trips magnetically at 3 to 5 times In (120 to 200 A for this 40 A unit), with a factory-calibrated instantaneous threshold of 4 x In ±20 % per IEC 60947-2. That makes it suitable for circuits where inrush is minimal — lighting, socket outlets, control transformers — and where selectivity with upstream C-curve or D-curve breakers is desired.
Physical fit and installation
Width is 54 mm (6 x 9 mm pitches), depth 74 mm, height 85 mm. Clip-on mounting to DIN rail. Tunnel terminals accept 1 to 16 mm² rigid or 1 to 10 mm² flexible wire; strip length 14 mm, tightening torque 2 N·m. Neutral is on the left.