The Siemens 5SY6610-8 is a SENTRON miniature circuit breaker in the 5SY6 design series, rated 10 A at 400 V AC with a D tripping characteristic. Four poles configured as 3P+N, which covers three-phase plus neutral in a single module.
Breaking capacity is rated 6 kA per EN 60898 and 15 kA per IEC 60947-2 — the higher figure under the industrial standard gives you selectivity headroom downstream of a larger upstream device. At DC, the maximum rated voltage is 72 V with a 15 kA breaking capacity per IEC 60947-2. For UL 1077 and CSA C22.2 No. 235 applications, the interrupting rating is 5 kA at AC.
Mounts via the quick assembly system — snap onto DIN rail, any position. The housing is 72 mm wide (4 width units), 90 mm tall, 76 mm deep with a 70 mm installation depth. Combined terminals top and bottom accept solid or stranded conductors from 0.75 to 35 mm². IP20 with connected conductors; touch protection is built in. Halogen-free and silicon-free construction suits environments where outgassing matters, such as clean rooms or sealed enclosures.