The Siemens 5SV3346-6KK01 is a 4-pole SENTRON residual current circuit breaker (RCCB), type A, short-time delayed, rated at 63 A with 30 mA residual sensitivity on a 400 V AC supply. The short-time delayed design (0.8 kA per IEC 61008-1) means it tolerates brief surge currents from downstream equipment without nuisance tripping — useful on circuits feeding motor drives or switched-mode power supplies that draw a short inrush.
Grid spacing is 60 mm, so it lines up with standard busbar systems and enclosure cutouts. Mount in any position — no derating for orientation. Supply can enter top or bottom, which simplifies busbar routing in crowded panels. IP20 with conductors connected; fine inside a distribution board, not for wet environments.