SENTRON 5SY6310-6 — panel-builder field note
The Siemens 5SY6310-6 is a 3-pole SENTRON miniature circuit breaker with B-curve tripping characteristic, rated 6 kA per EN 60898-1 and 15 kA per IEC 60947-2. At 400 V AC it handles the standard 50/60 Hz supply; the DC side is rated 15 kA at 60 V (max 72 V). This is a current-production part — no end-of-life notice on file — so it's a straightforward BOM line for new panels or replacement of an older 5SY-series MCB in the same footprint.
Breaking capacity — what the dual rating means
Two breaking-capacity numbers: 6 kA under EN 60898-1 (the household / commercial standard) and 15 kA under IEC 60947-2 (the industrial standard). The B-curve (3–5× In instantaneous trip) is standard for lighting and general-purpose loads, not motor starts. If your line uses this MCB for a motor branch, confirm the inrush won't nuisance-trip the B characteristic.
IP20 with conductors connected — fine for a closed panel, not for washdown zones.
Listed to IEC / EN 60898-1, IEC / EN 60947-2, and UL1077 / CSA C22.2 No.235 (5 kA at AC under UL). Halogen-free and silicon-free construction. The manufacturer provides a declaration of conformity covering RoHS and REACH; the standard IEC/EN ratings are printed on the nameplate for panel traceability.