The Schneider A9F05170 is a 1-pole Acti9 iC60 miniature circuit breaker rated at 0.5 A with a D curve. It's a thermal-magnetic MCB built for distribution boards, snapping onto a standard DIN rail.
Breaking capacity is 50 kA Icu at 220...240 V AC per EN/IEC 60947-2, and 6 kA Icn at 230 V AC per EN/IEC 60898-1. That 50 kA rating at typical mains voltage gives you real fault-current headroom in a panel — it's not a residential-grade device. It also carries 15 kA at 12...60 V DC. The part is certified to both the industrial (60947-2) and household (60898-1) standards, so it's accepted across commercial and light industrial builds. Overvoltage category IV means it's rated for the main incoming supply, not just sub-circuits.
Width is 18 mm (2 x 9 mm pitches), height 91 mm, depth 78.5 mm. That's a standard single-module footprint on a DIN rail — no surprises in a populated enclosure. Wire stripping length is 14 mm. IP20 rated, so it's for indoor panel use only.