The Siemens 5SN6210-7CN is a SENTRON miniature circuit breaker — 2-pole, C-curve, rated 10 A at 400 V AC, with a breaking capacity of 6 kA per EN 60898. Two poles let it switch both phase conductors in a single-phase or two-phase branch, but it does not switch the neutral — the neutral conductor must be connected separately or through a dedicated neutral bar.
Panel fit and DIN-rail footprint
At 36 mm wide (2 modular width units), this breaker occupies two standard 18 mm DIN-rail slots. Height is 90 mm. Mounting position is unrestricted, so it can sit horizontally or vertically in a sub-distribution board. The IP20 rating applies with conductors connected, meaning the busbar stabs and terminals are finger-safe once wired. It accepts solid conductors up to 25 mm², which covers most sub-feed and branch-circuit sizes in a residential or light commercial panel.