The A9F74170 is an ultra‑low‑current, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 iC60N series, featuring a C‑curve tripping characteristic (magnetic trip at 8 × In). With a rated current of just 0.5 A, this MCB is specifically tailored for the most sensitive circuits – including control transformers, signal lines, electronic power supplies, and instrumentation – where even minor overcurrents can damage delicate components and where traditional higher‑rated breakers offer inadequate protection. The C‑curve strikes a fine balance between immunity to harmless transient surges and rapid response to genuine faults, ensuring nuisance‑free operation in low‑power applications. Despite its minimal rating, this breaker delivers an outstanding ultimate breaking capacity of 50 kA at 220‑240 V AC under the industrial EN/IEC 60947‑2 standard, and 6 kA at 230 V AC per the residential EN/IEC 60898‑1 norm – guaranteeing reliable fault interruption even in high‑fault‑current scenarios. It is certified to both standards, making it suitable for industrial automation panels, commercial control cabinets, and specialised residential metering systems. The device incorporates the proven VisiTrip fault indicator, which instantly highlights the tripped pole for rapid diagnosis, and the VisiSafe green strip that offers positive visual confirmation of contact opening – a vital safety check for maintenance. Its quick‑make/quick‑break mechanism, independent of the toggle handle, ensures consistent performance over 10,000 electrical and 20,000 mechanical cycles. With a compact 18 mm width (2 modules) and DIN‑rail mounting, it optimises panel space. The double‑tunnel terminals accept conductors up to 25 mm² (rigid) and 16 mm² (flexible) with a 2 N·m torque, and the breaker offers IP20 terminal protection and IP40 when enclosed, operating from -35 °C to +70 °C. Built with halogen‑free plastics and PVC‑free materials, it achieves 54% recyclability and a total lifecycle carbon footprint of 14 kg CO₂ eq., reflecting Schneider Electric’s eco‑design approach. The model carries NF quality label and is fully compatible with the Acti 9 range of RCDs and busbars.
