The Siemens SENTRON 5SV4446-0LA01 is a 4-pole residual current circuit breaker (RCCB) for AC fault currents, rated 63 A at 230/400 V with a 10 kA short-circuit current rating. It is a short-time delayed design, meaning it tolerates brief surge currents (rated 3 kA) without tripping, which is useful for selectivity with downstream devices or loads with inrush.
At 65 °C it drops to 57.35 A, and at 70 °C to 48.84 A.
Snaps onto DIN rail (any mounting position). Depth is 70 mm, height 90 mm, width 72 mm (4 standard width units).