The Siemens 5SY4310-8CC is a SENTRON miniature circuit breaker, 3-pole, D-curve, rated 10 A at 400 V AC with a 10 kA breaking capacity per EN 60898. That D characteristic means it handles high inrush currents — motor starts, transformer energization, welding equipment — without nuisance tripping on the magnetic release. The 10 kA rating at 400 V gives you selectivity headroom downstream of a larger feeder breaker in a 400 V panel.
Ratings & Compliance
Breaking capacity: 10 kA per EN 60898, 5 kA per UL 1077 and CSA C22.2 No. 235. That UL/CSA supplementary protector rating matters if the panel ships to North America — the 5 kA SCCR at 400 V is enough for most branch circuits behind a current-limiting feeder. Halogen-free and silicon-free construction meets clean-room and high-reliability specs.