What this MCB is and what it does
The Siemens 5SL6208-7RC is a 2-pole miniature circuit breaker from the SENTRON 5SL6 series, rated 8 A with a C tripping characteristic and a breaking capacity of 7.5 kA per EN 60898. It protects branch circuits in residential and infrastructure panels against overloads and short circuits — the C curve means it tolerates moderate inrush (e.g., from small motors or transformers) before tripping, so it's a common choice for general-purpose socket circuits and lighting in commercial fit-outs.
Key ratings and what they mean for fit
Rated 8 A at 415 V AC (multi-phase) and 250 V AC single-phase, with a maximum multi-phase voltage of 440 V AC. The 7.5 kA breaking capacity (EN 60898) tells you it can safely interrupt fault currents up to that level without welding contacts or cascading upstream — adequate for most residential and light commercial distribution boards where the prospective short-circuit current stays under that threshold. For DC circuits, it's rated up to 72 V, so it can also serve DC sub-distribution in telecom or solar combiner boxes. Mechanical endurance is 10 000 switching cycles — not a high-cycle part for frequent switching duty, but fine for a protective device that operates only on fault or during manual isolation. The IP20 rating (with connected conductors) means it's for dry indoor enclosures only; no washdown or outdoor exposure without a higher-rated enclosure around it.
Mounting and integration
Snaps onto standard DIN rail (35 mm). Width is 36 mm (2 width units), depth 76 mm, height 90 mm, with an installation depth of 70 mm behind the panel face. Mounting position is any — no derating for horizontal or inverted orientation. Sealable design allows the installer to lock the toggle in the OFF position for lockout/tagout compliance. Touch protection is built in (finger-safe terminals). Halogen-free and silicon-free construction — relevant for environments where outgassing during a fire could damage electronics or harm personnel (e.g., data centers, clean rooms, or public transit infrastructure).