The Schneider Electric A9KF71420BQ is an Acti9 K60 miniature circuit breaker — a 4-pole, 20 A thermal-magnetic MCB with a C-curve trip characteristic. It breaks 10,000 A Icn at 415 V AC, 50/60 Hz, per EN/IEC 60898-1, which is the standard governing residential and light commercial overcurrent protection. The C-curve (magnetic trip at 5 to 10 x In) suits it for mixed loads where moderate inrush — like small motors, fluorescent banks, or transformers — is present but not extreme. The 20,000-cycle electrical and mechanical endurance aligns with the duty cycle of a typical sub-distribution board, not a switch-disconnector cycled daily. IP20 finger-safe terminals keep it inside a panel; this is not a standalone outdoor breaker.
The Acti9 K60 series is Schneider's current-generation compact MCB range, so the A9KF71420BQ carries full manufacturer support and compliance documentation. Standards compliance includes EN/IEC 60898-1, pollution degree 2, overvoltage category II, and tropicalisation class 2 per IEC 60068-1 — meaning it handles 95% relative humidity at 55 °C without derating.
Integration notes
The toggle control is fixed-mount only — no rotary handle option on this variant. Earth-leakage protection is not integrated; if you need that, it's a separate RCBO or add-on Vigi module in the Acti9 range. Operating altitude is rated to 2000 m without derating. Above that, the dielectric withstand and cooling drop off — consult the thermal curve if your panel sits at elevation. The 70 mm depth is standard for this pole count; it leaves enough finger space behind a 100 mm deep enclosure.