What it is and what the ratings mean for fit
The Siemens 5SV5412-0 is a SENTRON residual current circuit breaker (RCCB) — a 2-pole, Type AC, instantaneous device rated 25 A at 230 V AC, 50 Hz, with a 100 mA trip threshold. That 100 mA rating means it's sized for general fault protection on circuits where a lower 30 mA threshold would cause nuisance tripping from normal leakage (e.g., long cable runs or equipment with inherent leakage). The 6 kA short-circuit current rating (SCCR) tells you it can safely interrupt a fault up to that level without upstream damage — coordination with a 6 kA MCB or fuse is straightforward.
Mounting and panel integration
Snaps onto a DIN rail (REG), occupies 2 modular width units (36 mm), and can be mounted in any position. Depth is 70 mm — standard for a 2-pole RCCB in a distribution board. The IP20 rating applies when the board is installed with conductors connected, so it's intended for enclosed panels, not open washdown areas. Supply can enter from top or bottom, which saves time during rework or when the panel layout forces a reverse feed.
Key approvals and standards
Rated according to EN 60898 and IEC 61008-1 at 0.5 kA for the switching capacity under those standards. Overvoltage category III, silicon-free design. The 2,000 mechanical switching cycles typical service life is standard for an RCCB — not a high-cycle contactor, but fine for its protection role.