The A9F75303 is a three‑pole (3P) miniature circuit breaker from Schneider Electric’s Acti9 iC60N series, rated at 3 A with a D‑curve tripping characteristic (magnetic threshold at 12 × In). As a 3‑pole device protecting all three phases, it is specifically designed for three‑phase AC systems where complete isolation of all lines is essential – making it a core component for industrial control panels, motor control centres, and distribution boards in commercial and light industrial installations. The D‑curve is engineered for circuits with high inrush currents, such as transformers, solenoid valves, capacitive loads, and motor starters, where B‑ or C‑curve breakers would be prone to nuisance tripping. Despite its low 3 A rating, this MCU delivers a robust ultimate breaking capacity of 50 kA at 220‑240 V AC (per IEC 60947‑2) and 6 kA at 400 V AC (per IEC 60898‑1), ensuring 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 features the intuitive VisiTrip indicator, which instantly identifies the tripped pole for fast fault diagnosis, and the VisiSafe green strip that provides clear visual proof 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 54 mm width (6 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) with a 2 N·m torque. Operating reliably 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 39 kg CO₂ eq. – all reflecting Schneider Electric’s commitment to sustainable, high‑performance power distribution.
