The A9F55104 is a 4‑ampere, single‑pole miniature circuit breaker from Schneider Electric’s Acti9 iC60H range, equipped with a D‑curve tripping characteristic (magnetic threshold at 12 × In). This high‑threshold D‑curve is purpose‑built for circuits with significant inrush currents – think small transformers, solenoid valves, motor starters, and capacitive loads – where B‑ or C‑curve breakers would be susceptible to nuisance tripping. Despite its modest 4 A rating, this MCB delivers an exceptional ultimate breaking capacity of up to 70 kA at 220‑240 V AC under the industrial EN/IEC 60947‑2 standard (with derated values for higher voltages and DC applications), and 10 kA at 240 V AC per the residential EN/IEC 60898‑1 norm, ensuring robust fault clearing even in high‑fault‑current environments. It complies with both standards, offering seamless integration across industrial control cabinets, commercial distribution boards, and residential consumer units. The breaker features the intuitive VisiTrip fault‑finder window, which visually identifies the tripped pole to shorten troubleshooting time, and the VisiSafe green strip that provides unmistakable proof of contact separation – a vital safety check for maintenance personnel. Its fast‑make/quick‑break mechanism, independent of the toggle handle, guarantees consistent switching performance over 10,000 electrical and 20,000 mechanical cycles. With a compact 18 mm width (2 modular pitches) and DIN‑rail clip‑on mounting, it optimises panel space. The double‑tunnel terminals accept rigid conductors up to 25 mm² and flexible up to 16 mm², with a 2 N·m torque. The device offers IP20 terminal protection, operates from -35 °C to +70 °C, and is built with halogen‑free plastics, PVC‑free construction, and a 54% recyclability rate, with a total lifecycle carbon footprint of 14 kg CO₂ eq. – all transparently disclosed in the product’s environmental profile.
