The ABB S801S-K10 is a 1-pole high-performance miniature circuit breaker (MCB) with a K-trip curve, rated at 10 A and 230 V AC. It snaps onto a DIN rail for panel integration. The K characteristic means it's designed for loads with moderate inrush — think motor starters, transformers, or industrial lighting circuits — where the magnetic trip threshold is set higher than a standard B or C curve to avoid nuisance trips on startup.
Breaking capacity and selectivity
Interrupt rating is 50 kA at 240/415 V AC — that's a serious short-circuit capacity for a 1-pole device. It means the breaker can safely clear a fault up to 50 kA without welding contacts or cascading upstream. For a panel engineer coordinating selectivity, that figure gives headroom downstream of a larger main breaker. The dual tripping mechanism (thermal for overload, electromechanical for short circuit) is standard for MCBs, but the K-curve's magnetic trip point is typically 10–14× rated current, so it holds through motor start without dropping out.
Panel fit and compliance
Mounts on a standard DIN rail, 1-pole width (roughly 18 mm per pole). Cage terminals accept solid or stranded copper up to 25 mm². The S801S-K10 complies with IEC/EN 60898-1 and IEC/EN 60947-2, covering both residential and industrial applications. Compliance documentation (RoHS, REACH) is available from the manufacturer; UL/CSA listings are typical for this series but should be verified against the specific project jurisdiction.