The Schneider Electric A9P64716 is a 3P+N miniature circuit breaker from the Acti9 iC40N series, rated 16 A with a D tripping curve. The D curve means the magnetic trip operates at 10 to 14 times In (per EN/IEC 60898-1) or 12 x In ±20 % (per EN/IEC 60947-2) — that wide instantaneous threshold is sized for high-inrush loads like motor starters, transformers, and discharge lighting where the start-up surge would nuisance-trip a B or C curve breaker. The thermal-magnetic trip unit handles the overload protection; the magnetic element clears short-circuits.
This breaker carries a dual-rated breaking capacity: 10 kA Icu at 400 V AC per EN/IEC 60947-2 (the industrial standard for performance) and 6000 A Icn at 400 V AC per EN/IEC 60898-1 (the household/ commercial standard). The 6 kA Icn rating is the lower commercial-duty value; the breaker is certified to both standards, so it fits installations that require either. It is also approved for isolation (suitability for isolation per EN/IEC 60947-2) — meaning it doubles as a visible-break disconnect when locked off with a padlocking device.
The 3P+N body takes 6 x 9 mm pitches — 54 mm wide total — so it occupies three standard module spaces plus a neutral pole. Tunnel terminals accept 1 to 16 mm² rigid or 1 to 10 mm² flexible; tightening torque is 2 N.m top or bottom. IP20 on the terminals, IP40 inside a modular enclosure — fine for a clean panel, not for washdown zones.