The A9N18446 is a high‑power, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 C120H series, rated at 80 A with a C‑curve tripping characteristic (magnetic threshold at 8 × In). As part of the C120H family – designed for industrial and tertiary buildings – this MCB combines three essential functions in one compact device: reliable protection against overcurrents and short‑circuits, local switching control, and galvanic isolation. Its C‑curve strikes a well‑balanced response between overload protection and tolerance of moderate inrush currents, making it particularly suited for high‑capacity lighting banks, distribution feeders, small motor circuits, and HVAC equipment in commercial and light industrial environments. The breaker delivers a robust ultimate breaking capacity of 15 kA at 220‑240 V AC (both per IEC 60947‑2 and IEC 60898‑1), with derated values for higher voltages, ensuring dependable fault interruption in a wide range of applications. Certified to both industrial and residential standards, it offers seamless integration into mixed‑use projects. A prominent green indicator strip provides visible proof that contacts are physically open, guaranteeing safe downstream maintenance. The quick‑make/quick‑break mechanism, independent of manual toggle action, ensures consistent performance over 5,000 electrical and 20,000 mechanical cycles. With a compact 27 mm width (3 modular pitches) and DIN‑rail mounting, it saves panel space while the tunnel‑type terminals accept conductors up to 50 mm² (rigid) with a 3.5 N·m torque. The device operates reliably from -30 °C to +60 °C and features IP20 terminal protection. Sustainability is addressed with a 60% recyclability potential and a total lifecycle carbon footprint of 19 kg CO₂ eq., though the product contains halogen above thresholds.
