The Schneider Electric A9KF71103BQ is a 1-pole Acti9 K60 miniature circuit breaker rated 3 A with a C-curve trip characteristic (magnetic tripping between 5 and 10 times In).
The 3 A C-curve is sized for lighting, control transformers, or small resistive loads where the inrush is moderate. Thermal-magnetic trip technology means the bimetal handles sustained overloads and the solenoid clears short-circuits — no electronics to fail. That's one of the narrowest footprints for a single-pole MCB, so it packs tight in a crowded enclosure. Tighten to 2 N·m. IP20 finger protection is standard for a panel-mounted breaker — no special handling needed inside a closed enclosure. Pollution degree 2 covers normal factory-floor conditions with non-conductive contamination. Operating altitude up to 2000 m and 95% relative humidity at 55 °C with tropicalisation class 2 per IEC 60068-1 mean it holds up in hot, humid environments without derating surprises.