The Schneider Electric A9KF71101BQ is a 1A miniature circuit breaker from the Acti9 K60 series, built for distribution boards and sub-panels where a single-pole, C-curve thermal-magnetic trip protects a 1A branch circuit. The 18mm width (2 x 9mm pitches) fits a standard DIN-rail enclosure, and the IP20 finger-safe terminals accept up to 25mm² rigid or 16mm² flexible cable.
The C-curve (magnetic trip at 5–10 x In) means this breaker holds through moderate inrush — typical for small transformers, lighting ballasts, or control-circuit power supplies — and trips fast on a hard short. The thermal-magnetic trip unit combines a bimetal strip for overload protection and a solenoid for short-circuit; no electronic adjustment, so it's a fit-and-forget part for fixed loads.
Panel integration
Snaps onto a standard 35mm DIN rail — no tools needed for mounting. The 18mm width occupies two 9mm module pitches, so plan for that footprint in your enclosure layout. Tunnel-type terminals accept 1–25mm² rigid or 1–16mm² flexible cable; strip 14mm and torque to 2 N·m for both line and load connections. The toggle control gives a clear visual on/off state. Operating altitude is 0–2000m; above that, derate the dielectric withstand. Pollution degree 2 covers normal indoor environments with only non-conductive contamination.