The Siemens 5SV3112-6 is a SENTRON residual current circuit breaker (RCCB), 2-pole, Type A, rated 25 A with 10 mA residual sensitivity for 230 V AC at 50 Hz. It is an instantaneous-trip device — no intentional short-time delay — so it clears a ground fault as fast as the waveform allows, which matters when coordinating with downstream electronics that can't ride through a delayed trip. The 10 kA short-circuit current rating (SCCR) per means it can safely interrupt a fault up to that level without welding its contacts or cascading failure upstream, assuming the upstream protective device is sized to let it do so.
Snaps onto DIN rail (REG per) and occupies 2 modular width units (36 mm per,). The 70 mm installation depth matches the standard SENTRON RCCB/RCD footprint — it drops into the same cutout as the 5SU9 series or the 5SL MCBs. Mounting position is unrestricted, and the supply can enter from top or bottom. The IP20 rating is typical for an enclosed distribution board; the conductors must be connected for the protection to hold. Silicon-free construction suits environments where silicone outgassing can foul contacts or optics.
The 10 mA residual rating makes this unit suitable for circuits requiring enhanced protection against electric shock — typically circuits supplying wet-area outlets or medical equipment where the standard 30 mA threshold is too high. Type A detection covers sinusoidal AC residual currents and pulsating DC residuals up to 6 mA, which covers most single-phase rectified loads like switch-mode power supplies and LED drivers. The 0.5 kA rated conditional short-circuit current per IEC 61008-1 is the withstand rating under the standard's test conditions; the 10 kA SCCR is the higher breaking capacity when backed by an appropriate series fuse rated up to 63 A. Supplementary devices can be installed — typically an auxiliary switch or shunt trip for remote indication.