The Siemens 5SV4412-0 is a 2-pole residual current circuit breaker (RCCB) from the SENTRON family, Type AC, rated 25 A with a 100 mA trip threshold at 230 V AC. That 100 mA sensitivity is sized for equipment protection rather than personnel shock — it catches insulation degradation on fixed wiring or motor windings before leakage climbs high enough to trip a 30 mA device, provided the downstream circuit is coordinated for it.
What the ratings mean for fit
Rated 25 A continuous at 230 V AC, with a 10 kA short-circuit current rating (SCCR) per IEC 61008-1. That 10 kA withstand means the RCCB can safely interrupt a fault up to that level without welding its contacts or cascading damage upstream — provided the prospective short-circuit current at the installation point does not exceed it. The 100 mA residual sensitivity is instantaneous (no intentional delay), so it clears earth faults within the standard trip curve for Type AC devices, which detect sinusoidal AC leakage only. Supply voltage is 230/400 V AC, 50 Hz only — this unit is not rated for 60 Hz operation. The 2-pole construction switches both phase and neutral on a single-phase supply or one phase plus neutral on a three-phase system. Power dissipation is 0.6 W per pole in the hot operating state, negligible for panel thermal budgeting but worth noting if the RCCB sits in a densely packed enclosure with other heat sources.
Mounting and integration
Snap-on DIN rail (REG) mounting per EN 60715, occupying 2 modular width units (36 mm wide). Installation depth is 70 mm; the device can be mounted in any orientation. IP20 rating applies only when the distribution board cover is installed and conductors are connected — bare terminals are not finger-safe. The grid spacing of 60 mm matches standard European distribution board cutouts. Supply can enter from top or bottom.