The A9F55204 is a two‑pole (2P) miniature circuit breaker from Schneider Electric’s Acti9 iC60H range, rated at 4 A with a D‑curve tripping characteristic (magnetic threshold at 12 × In). The D‑curve is specifically designed for circuits with pronounced inrush currents – such as small transformers, solenoid valves, motor starters, and capacitive loads – where lower‑curve devices would be prone to nuisance tripping. With both poles protected, this 2‑pole breaker ensures simultaneous disconnection of both lines, providing enhanced safety and complete isolation in single‑phase AC or DC installations. Despite its modest 4 A rating, this MCB delivers an exceptionally high ultimate breaking capacity of 70 kA at 220‑240 V AC (per IEC 60947‑2) – a performance level typically reserved for much larger breakers – and 10 kA at 415 V AC (per IEC 60898‑1), guaranteeing reliable fault clearing even in high‑fault‑current industrial environments. It is dual‑certified to both industrial and residential standards, offering flexible deployment across control panels, distribution boards, and specialised equipment protection. The breaker incorporates the intuitive VisiTrip indicator window, which instantly identifies the tripped pole to accelerate troubleshooting, and the VisiSafe green strip that provides undeniable visual confirmation of contact opening – a critical safety feature for maintenance work. Its quick‑make/quick‑break mechanism, independent of handle position, ensures consistent performance over 10,000 electrical and 20,000 mechanical cycles. With a compact 36 mm width (4 modular pitches) and DIN‑rail mounting, it saves panel space while the double‑tunnel terminals accept conductors up to 25 mm² (rigid) and 16 mm² (flexible). Operating from -35 °C to +70 °C, this MCB is built with halogen‑free plastics and PVC‑free materials, achieving 54% recyclability and a total lifecycle carbon footprint of 28 kg CO₂ eq. – all reflecting Schneider Electric’s commitment to sustainable, safe energy management.
