The Schneider Electric A9F07403 is a 4-pole Acti9 iC60H miniature circuit breaker rated at 3 A with a C curve, designed for distribution in AC or DC networks at 50/60 Hz. Its thermal-magnetic trip unit protects against overload and short-circuit, with a magnetic tripping limit of 8 x In ±20%. Rated breaking capacity hits 70 kA Icu at 380–415 V AC per EN/IEC 60947-2, and 10 kA Icn at 400 V AC per EN/IEC 60898-1 — enough headroom for high-fault panelboards where selectivity matters. It snaps onto a DIN rail (8 x 9 mm pitches) and occupies 72 mm width, 91 mm height, 78.5 mm depth — standard for a 4P MCB in a distribution board.
Overvoltage category IV qualifies it for main distribution boards at the service entrance.