The A9F75140 is a 40‑ampere, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 iC60N series, engineered with a D‑curve tripping characteristic (magnetic threshold at 12 × In). The D‑curve is specifically designed for circuits with substantial inrush currents – such as motor starters, transformers, solenoid banks, and capacitive loads – where B‑ or C‑curve breakers would be susceptible to nuisance tripping. With a robust 40 A rating, this MCB provides a rated ultimate breaking capacity of 10 kA at 220‑240 V AC under the industrial EN/IEC 60947‑2 standard (with higher ratings at lower voltages) and 6 kA at 230 V AC per the residential EN/IEC 60898‑1 norm, ensuring dependable fault clearance even in demanding high‑fault‑current environments. Certified to both standards, it offers versatile deployment across industrial motor control centres, commercial distribution boards, and heavy‑duty residential applications. Designed with Class‑2 insulation for enhanced operator safety, the breaker also coordinates fully with Acti 9 RCDs and Compact NSX MCCBs, streamlining system design. The device incorporates the intuitive VisiTrip fault‑finder window, which instantly highlights the tripped pole to accelerate troubleshooting, and the VisiSafe green strip that delivers unmistakable visual confirmation of contact opening – a critical safety feature for maintenance crews. Its quick‑make/quick‑break mechanism, independent of toggle position, guarantees consistent switching performance over 10,000 electrical and 20,000 mechanical cycles. Despite its high 40 A rating, the breaker retains a compact 18 mm width (2 modular pitches) and clips onto DIN rails, saving valuable panel space. The terminals are engineered for heavy‑duty wiring, accepting rigid conductors up to 35 mm² and flexible up to 25 mm² with a 3.5 N·m tightening torque. The device offers IP20 terminal protection and IP40 when enclosed, operates reliably from -35 °C to +70 °C, and is built with PVC‑free materials, though it contains halogen above thresholds. Achieving a 54% recyclability rate and a total lifecycle carbon footprint of 21 kg CO₂ eq., this MCB aligns with Schneider Electric’s sustainability objectives.
