The 5SY6425-7CC: At 35 °C ambient it carries the full 25 A; at 40 °C it derates to 23.5 A, at 45 °C to 22.72 A, at 50 °C to 21.9 A, and at 55 °C to 21.05 A (–).
Where it goes — panel integration
This breaker snaps onto a DIN rail using the quick assembly system and mounts in any position. It occupies 4 modular width units — standard 18 mm per unit, so 72 mm total. Installation depth is 70 mm; total depth is 76 mm. The top and bottom terminals are combined, meaning the same terminal accepts both the busbar and the outgoing conductor. Rated IP20 with connected conductors — fine inside an enclosure, not for wet washdown areas. Halogen-free and silicon-free matters if you're placing it in a sealed cabinet near sensitive electronics or in a clean-room zone where outgassing is a concern.