The Siemens SENTRON 5SL1163-7MB is a 1-pole miniature circuit breaker rated 63 A at 230/400 V AC, with a C tripping characteristic. Above that threshold, you need a higher-rated unit.
Width is 18 mm (1 modular unit), depth 76 mm, height 90 mm. Installation depth of 70 mm leaves clearance for rear-connected busbars. Mounting position is unrestricted, which helps in tight gland-plate layouts.
Halogen-free and silicon-free construction reduces outgassing in sensitive environments. Mechanical service life is rated at 4,000 switching cycles typical — adequate for branch-circuit protection where daily switching is rare.