The A9F77140 is a 40‑ampere, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 iC60N series, featuring a C‑curve tripping characteristic (magnetic threshold at 8 × In). The C‑curve offers an ideal trade‑off between overload protection and tolerance of moderate inrush currents, making it a versatile solution for general‑purpose distribution – including lighting networks, power outlets, small motor feeders, and control circuits in commercial buildings, industrial plants, and residential complexes. This MCB delivers a rated ultimate breaking capacity of 10 kA at 220‑240 V AC under the industrial standard EN/IEC 60947‑2 (with higher values at lower voltages) and 6 kA at 230 V AC per the residential norm EN/IEC 60898‑1, ensuring dependable fault clearance across a broad range of applications. Certified to both standards, it offers seamless integration into mixed‑use installations. The breaker incorporates the well‑proven VisiTrip fault‑finder window, which instantly pinpoints the tripped pole to reduce downtime, and the VisiSafe green strip that provides clear visual evidence of contact opening – a vital safety check for maintenance personnel. Its quick‑make/quick‑break mechanism, independent of handle position, ensures consistent switching performance over 10,000 electrical and 20,000 mechanical cycles. Despite its 40 A rating, the device 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 breaker 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. With a 54% recyclability rate and a total lifecycle carbon footprint of 21 kg CO₂ eq., this MCB aligns with Schneider Electric’s sustainable development goals.
