The 10 kA interrupting rating per EN 60898 at 415 V AC tells you this breaker can safely clear a fault up to 10 kA without welding its contacts or rupturing the housing — that's the standard for most residential and light commercial distribution boards in Europe and markets following IEC 60364. At 63 A, this is a main or heavy-feeder MCB — not a final-subcircuit device. Width is 18 mm (1 modular width unit), so it occupies a single 18 mm DIN-rail slot. Mounting position is unrestricted.
Integration notes
Power dissipation is 5.4 W per pole in hot operating state at rated current — total 21.6 W for the 4-pole unit. Factor this into enclosure thermal calculations to avoid nuisance tripping from ambient heating inside a crowded panel.