The Schneider Electric A9F03350 is a 3-pole Acti9 iC60N miniature circuit breaker rated at 50 A with a B-curve thermal-magnetic trip unit. Breaking capacity is 36 kA Icu at 12-133 V AC, 20 kA Icu at 220-240 V AC, 10 kA Icu at 380-415 V AC, and 6 kA Icu at 440 V AC per EN/IEC 60947-2. Under the 60898-1 standard it carries a 10 kA Icn at 400 V AC.
The double-terminal top and bottom accepts 1-35 mm² rigid or 1-25 mm² flexible, with a stripping length of 14 mm and a tightening torque of 3.5 N.m. That 35 mm² capacity on a 50 A breaker means you can land the incoming feeder without a separate terminal block, saving a row of DIN rail. Pollution degree 3 per EN/IEC 60947-2 and overvoltage category IV — this breaker is rated for the harsh electrical environment of a main distribution board where transient overvoltages are common, not just a clean subpanel. IP20 finger-safe terminals are standard for enclosed panels.