The Siemens SENTRON 5SL4563-6 is a 2-module (36 mm wide) miniature circuit breaker rated 63 A at 230 V AC with a B tripping characteristic and 10 kA breaking capacity per both EN 60898 and IEC 60947-2.
The B curve (3-5 In instantaneous trip) means it clears short-circuit faults fast but holds through motor inrush on smaller loads; it is the standard choice for residential and general-purpose lighting and socket circuits in Europe. The 10 kA breaking capacity (Icn per EN 60898, Icu per IEC 60947-2) tells you the breaker can safely interrupt a fault current up to 10 000 A without welding its contacts or failing catastrophically — adequate for most domestic and light commercial installations where the prospective short-circuit current at the board is below that level.
Tightening torque for the screw terminals is 2.5 to 3 N·m. IP20 with connected conductors is the expected protection for a DIN-rail device inside a closed enclosure.