The Siemens 5SV3312-3 is a 2-pole SENTRON residual current circuit breaker (RCCB) rated 25 A with a 30 mA trip threshold, type F, short-time delayed, for 230 V AC single-phase circuits. Type F means it handles residual currents up to 1 kHz — covers variable-speed drives and frequency converters that generate smooth DC or mixed-frequency fault currents a standard AC type would miss. The short-time delayed design (selective/short-time delayed) lets it coordinate with downstream RCCBs, so a fault on a branch trips the branch device before this main unit, keeping the rest of the panel live.
Type F detection covers residual pulsating DC, smooth DC, and mixed-frequency AC up to 1 kHz, so it's the right choice downstream of a VFD or UPS where a standard AC type would be blind to DC fault components. The short-time delayed characteristic (IΔn = 30 mA with intentional delay) provides selectivity: a downstream 30 mA instantaneous RCCB will trip first, leaving this unit closed and the rest of the circuit powered.
Depth is 70 mm, width 36 mm (2 MW), height 90 mm. Grid spacing 60 mm aligns with standard distribution board cutouts. IP20 with connected conductors and distribution board installed — protected against solid objects >12 mm, not against water ingress, so it belongs inside a closed panel or enclosure. Ambient operating range -25 °C to 45 °C; storage down to -40 °C. Silicon-free construction, which matters for automotive or aerospace panels where silicone outgassing can contaminate contacts or optics.