The A9F07350 is a Schneider Acti9 iC60H miniature circuit-breaker — 3-pole, 50 A rated current, C-curve trip (magnetic trip at 8 x In ±20 %). The 42 kA Icu at 133 V AC (per EN/IEC 60947-2) is the maximum fault current it can safely interrupt at that voltage; at 400 V AC the Icu drops to 15 kA, and the Icn (service breaking capacity per EN/IEC 60898-1) is 10 kA at 400 V. The thermal-magnetic trip handles overloads (thermal bimetal) and short-circuits (solenoid) in one unit — no separate block needed for those two functions, though earth-leakage protection requires a separate Vigi block. The toggle gives local on/off and a trip-indicator flag shows the breaker has tripped even if the handle is reset.
Dual-certified to EN/IEC 60947-2 (industrial) and EN/IEC 60898-1 (household and similar) — so it qualifies for both commercial and light-industrial installations. The IEC 60898-1 rating is the one that gives you the 10 kA Icn at 400 V; the 60947-2 rating gives the higher Icu values for industrial duty. The brand provides standard RoHS/REACH declarations on request.