The Siemens 5SV3312-6BA is a SENTRON residual current circuit breaker (RCCB) — a 2-pole, Type A device rated at 25 A with a 30 mA trip threshold, designed for 230 V AC systems. It carries a 10 kA short-circuit current rating (SCCR) per IEC 61008-1 and a 0.5 kA rated conditional short-circuit current per EN 60898. The instantaneous design means it trips without intentional delay on residual currents exceeding 30 mA, providing personnel protection against direct contact in final circuits.
The 30 mA trip threshold is the common personnel-protection level (IEC 60364-4-41), suitable for socket-outlet circuits, lighting, and general-purpose final subcircuits where the touch voltage must stay below 50 V. Rated current holds at 25 A from 40 °C through 60 °C ambient, then derates to 23.3 A at 65 °C and 17.62 A at 70 °C. In a warm panel (55 °C typical near a transformer or drive), the 25 A rating is still valid — no derating needed. Above 60 °C, the thermal curve governs; a 16 A load is safe at 70 °C, but a 20 A continuous load would risk nuisance tripping.
Mounting position is unrestricted, which simplifies layout in a crowded enclosure. The supply can enter from the top or bottom, so busbar routing is flexible. It is silicon-free, which matters for automotive or aerospace panels where silicone outgassing can contaminate contacts or optics.