Rated current and breaking capacity — what they mean for the BOM line
The A9F44303 is a Schneider Electric Acti9 iC60N miniature circuit breaker rated at 3 A with a C-curve magnetic trip characteristic (8 x In ±20 %).
Dual standard certification — the compliance gate
This breaker is certified to both EN/IEC 60898-1 and EN/IEC 60947-2. That dual certification is the compliance gate for panel builders: 60898-1 covers the domestic / commercial MCB application, while 60947-2 covers the industrial circuit-breaker role with higher interrupting ratings (50 kA Icu) and a pollution degree 3 rating, meaning it's verified for conductive-dust environments typical of control panels. The utilisation category is Category A per 60947-2, which means it is not intended for current making and breaking under fault — that is the upstream moulded-case or air breaker's job.
Panel integration — DIN rail and terminal constraints
It occupies 6 x 9 mm pitches (54 mm width) on the rail, which is the standard 3-pole MCB footprint — no surprise for a panel layout. The wire stripping length is 14 mm. IP20 finger protection is provided on the front face, so it is safe for open-panel installation but not for washdown zones. The toggle provides local on/off and trip indication; the unit can be padlocked in the off position for lockout/tagout.