The Siemens 5SY4310-8CC11 is a SENTRON miniature circuit breaker — 3-pole, D-curve, rated 10 A at 400 V AC, with a 10 kA breaking capacity tested to EN 60898.
Where it fits and how it mounts
The combined top and bottom terminals let you feed from either direction, which saves wire routing time on a crowded rail.
Environmental and compliance details
Halogen-free and silicon-free construction, so it won't outgas corrosive compounds in a sealed panel near sensitive electronics. Rated for railway applications per the design designation, which means it passed the vibration endurance test per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz).