SENTRON 5SQ2570-0KA02 — 2 A C-Curve MCB, 1P+N, 3 kA
That neutral conductor switching makes it the right choice for single-phase final circuits where isolating both conductors is required by local code or for maintenance safety. The 3 kA breaking capacity per EN 60898 at 240 V AC covers most residential and light commercial distribution boards — but if your panel's prospective short-circuit current exceeds 3 kA, step up to the 6 kA or 10 kA variants in the same SENTRON family.
Two modular width units at 18 mm each means this breaker occupies 36 mm of DIN-rail space — standard for a 1P+N device with neutral switching. Installation depth is 55 mm, shallower than the 70 mm typical of the 5SU series RCBOs, so it leaves more wiring room in shallow enclosures. Overvoltage category III confirms it's rated for fixed-installation downstream of the utility meter, not for equipment-level protection.