The A9F08301: The D curve (magnetic trip at 12 x In ±20 %) means this breaker tolerates high inrush currents — it is sized for motor, transformer, or lighting ballast loads where the start-up surge can hit 10–14 times the running current. At 1 A rated current, it protects a small motor or control transformer branch. The 10 kA Icn at 400 V (EN/IEC 60898-1) is the domestic-grade rating; the higher Icu figure governs in an industrial distribution board where the prospective short-circuit current can exceed 10 kA.
Occupies 6 x 9 mm pitches (54 mm wide) on the rail — three poles at 18 mm per pole. Depth is 78.5 mm, height 91 mm. IP20 finger-safe front; the busbar and wiring compartment are protected inside the enclosure. Pollution degree 3 (conductive pollution, e.g. panel dust with condensation) is handled without derating.
The A9F08301 is listed as current-production (active lifecycle stage). It is not subject to a phase-out notice or last-time-buy window.