What this MCB does and where it fits
The Siemens SENTRON 5SL6225-8CC is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 25 A at 400 V AC and a 6 kA breaking capacity per EN 60898. The D-curve means it tolerates high inrush currents — typically motor, transformer, or lighting ballast loads — without nuisance tripping on startup. It occupies 2 modular width units (36 mm) on a DIN rail, with an installation depth of 70 mm and overall depth of 76 mm, so it fits standard residential and light-commercial distribution boards.
Key ratings and what they mean for your panel
Breaking capacity of 6 kA at 400 V AC per EN 60898 — this is the standard residential/infrastructure rating; verify the prospective short-circuit current at the installation point doesn't exceed this. The D-curve trips magnetically between 10× and 20× In (250–500 A), so it's sized for loads with a high starting surge, not for general-purpose socket circuits where a B or C curve would be more selective. Power loss per pole is 3.2 W at rated current in hot state — factor that into enclosure thermal calculations if the board is densely populated.
Mounting and integration notes
Mounts on DIN rail in any position — no derating required for horizontal or inverted orientation. The IP20 rating (with connected conductors) means it's for enclosed panel use only, not for wet or dusty environments. Pollution degree 2 and overvoltage category III cover standard fixed-installation conditions. The breaker accepts supplementary devices (auxiliary contacts, shunt trips, under-voltage releases) for remote signaling or emergency-off circuits.