The Siemens 5SY6625-7CC is a SENTRON miniature circuit breaker with a C tripping characteristic, rated 25 A at 35 °C on AC supply. It is a 4-pole unit wired as 3P+N — the neutral pole switches with the phases, which matters when you need to isolate the neutral on a TN-S or TN-C-S system. The 6 kA breaking capacity is rated per EN 60898, the standard for household and similar installations, so this breaker is suited for final sub-distribution in industrial control panels, machinery supply, and building power distribution where the prospective fault current stays under 6 kA.
At 25 A, that gives you a magnetic trip window of 125 A to 250 A. The 6 kA breaking capacity per EN 60898 tells you the breaker can safely interrupt a fault up to 6,000 A at the rated voltage; if your panel's prospective short-circuit current exceeds that, you need an upstream current-limiting device or a higher-rated breaker. Temperature derating is published: 25 A at 35 °C, 23.5 A at 40 °C, 22.72 A at 45 °C, 21.9 A at 50 °C, 21.05 A at 55 °C. If your enclosure runs hot — common in packed panels or near heat sources — use the 40 °C or 50 °C column to size the load, not the 35 °C figure. Rated operational voltage is 440 V AC for multi-phase operation at 50/60 Hz. The 4-pole (3P+N) design with neutral switching gives full isolation on all poles. The breaker occupies 4 modular width units (72 mm) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm.
The IP20 rating (with connected conductors) means it is protected against solid objects larger than 12.5 mm but not against moisture; install it inside a panel with at least IP54 enclosure rating for washdown areas.