The A9F55140 is a 40‑ampere, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 iC60H series, engineered with a D‑curve tripping characteristic (magnetic threshold at 12 × In). This high‑threshold D‑curve is specifically tailored for circuits that experience substantial inrush currents – such as large motor starters, hoists, transformers, solenoid banks, and capacitive loads – where lower‑curve devices would be prone to nuisance tripping. Rated at 40 A, this MCB delivers robust protection against both overloads and short‑circuits, with a dependable ultimate breaking capacity of 15 kA at 220‑240 V AC under the EN/IEC 60947‑2 industrial standard, and 10 kA at 240 V AC per the EN/IEC 60898‑1 residential norm. Its dual‑standard compliance ensures versatile deployment across factory automation, commercial distribution boards, and residential consumer units. The breaker incorporates the intuitive VisiTrip fault‑finder window, which instantly highlights the tripped pole to accelerate troubleshooting, and the VisiSafe green strip that provides irrefutable visual proof of contact separation – a critical safety check for downstream maintenance. Its fast‑make/quick‑break mechanism, independent of the toggle handle, guarantees consistent switching performance over 10,000 electrical and 20,000 mechanical cycles. Despite its high current rating, the device maintains a compact 18 mm width (2 modular pitches) and clips securely onto DIN rails, maximising panel density. The double‑tunnel terminals accept large conductors, and the breaker operates reliably from -35 °C to +70 °C. On the sustainability front, it is PVC‑free and achieves 54% recyclability, though it contains halogen above thresholds; its total lifecycle carbon footprint is quantified at 21 kg CO₂ eq., with full environmental disclosure in line with Schneider Electric’s net‑zero commitments.
