The Siemens 5SL3250-7MB is a SENTRON miniature circuit breaker — 2-pole, C-curve, 50 A rated current at 400 V AC, with a 4.5 kA breaking capacity per EN 60898. The 4.5 kA rating at 400 V tells you it's sized for standard domestic or light-commercial fault levels, not heavy industrial switchgear.
Depth is 76 mm, height 90 mm, so it clears most shallow enclosures. The 70 mm installation depth means the busbar and wiring pocket fit without forcing the backplate.
The C-curve trips at 5–10 times rated current for short-circuit protection — so a 50 A C-curve will hold a motor starting surge around 250–500 A for a brief period before clearing a hard fault.