The Siemens 5SJ6508-7 is a SENTRON 5SJ6 miniature circuit breaker — a 1P+N unit with a C-curve trip characteristic, rated 8 A at 240 V AC and 6 kA breaking capacity per EN 60898 and IEC 60947-2.
At 8 A and 6 kA, this breaker fits a final subcircuit protecting a 1.5–2.5 mm² cable run against overload and short-circuit — the C-curve avoids nuisance tripping on the magnetizing inrush of a small contactor or a few fluorescent ballasts. IP20 with connected conductors is the standard protected-environment rating for distribution boards indoors — no washdown or outdoor exposure without an enclosure.