The Siemens 5SY4102-7CC is a 1-pole SENTRON miniature circuit breaker with a C-curve trip characteristic, rated 10 kA breaking capacity at 400 V AC according to EN 60898.
Where it fits and how it mounts
Depth is 76 mm overall, installation depth 70 mm — that 6 mm difference is the front toggle throw, so plan your gland plate clearance accordingly. Mounting position any orientation, which helps when you're stuffing a tight sub-panel.
Termination and accessories
Combined terminal top and bottom — same clamping system accepts copper or aluminum conductors without changing lugs. Sealable if your site requires lockout-tagout on the breaker handle. Supplementary devices installable: shunt trip, auxiliary contacts, alarm switch — all snap onto the right side without losing a module width.