The Siemens 5SY6106-6 is a 1-pole B-curve miniature circuit breaker from the SENTRON series, rated 6 kA breaking capacity per IEC/EN 60898-1 and 30 kA per IEC 60947-2. It also carries a UL 1077 listing at 5 kA, giving it acceptance across European and North American panels without a separate supplementary protector.
If this breaker feeds a contactor coil or small transformer inrush, verify the inrush doesn't exceed the B-curve's magnetic threshold; a C-curve sibling would hold better. For higher available fault current, the 30 kA rating per IEC 60947-2 applies — this is the rating an engineer should use when the breaker is applied as a branch-circuit device per 60947-2 rather than a household MCB per 60898-1. The 5 kA UL 1077 figure is the supplementary-protector rating for North American panels where the upstream branch breaker provides the main SCCR.
Compliance documentation includes IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. The part is halogen-free and silicon-free, which simplifies compliance with RoHS and REACH declarations for the BOM.
Panel integration
IP20 with connected conductors; inside a panel this is standard. The sealable option (padlockable toggle) is available if lockout/tagout is required for the line-side isolation point.