The Siemens SENTRON 5SL6125-7YA is a 1-pole miniature circuit breaker with a C-curve tripping characteristic, rated 25 A and 6 kA interrupting capacity per EN 60898. It's designed for residential and infrastructure branch-circuit protection — think lighting, socket outlets, and small appliance circuits where moderate inrush (motors, transformers) needs a C-curve to avoid nuisance tripping.
C-curve means it holds through 5–10× rated current for a few seconds, so it won't trip on the starting surge of a 1–2 hp pump or a small compressor. Mount it in any position; the -40 to 75 °C ambient range covers unheated basements and outdoor enclosures alike.