The Siemens SENTRON 5SJ6210-7RC is a 2-pole miniature circuit breaker from the Retail line, rated 10 A with a C tripping characteristic and a 6 kA breaking capacity per EN 60898. It's a current-production part, so you're not chasing a last-time buy — this one stays in the catalog for new builds and panel spares alike.
At 10 A and 6 kA, this breaker handles residential or light commercial sub-feeds; the 6 kA SCCR per EN 60898 is adequate for most panelboards fed by a transformer of typical impedance. The 2-pole design switches both line and neutral on a single-phase circuit. Mounting position any simplifies panel layout — no derating needed if you install it sideways or upside down.
The breaker accepts supplementary devices like shunt trips, auxiliary contacts, and alarm switches — all from the SENTRON accessory range. If your panel already uses those add-ons, the 5SJ6210-7RC drops in without rewiring the accessory bus.