The Siemens 5SV3612-8 is a SENTRON selective residual current circuit breaker (RCCB), 2-pole, Type A, rated 25 A at 40 °C on a 230/400 V AC system at 50 Hz. Selective design means it coordinates with downstream RCCBs — only the faulted branch trips, keeping the rest of the panel live. That's the difference between a short line-down and a whole-section blackout. The 70 mm installation depth matches standard distribution board cutouts — no panel rework needed to swap in this unit.
Rated 25 A continuous from 40 °C up to 60 °C without derating — that's the full thermal headroom for most panel environments. At 65 °C it drops to 23.3 A, and at 70 °C to 17.62 A. If your enclosure runs hot, size upstream protection accordingly. Short-circuit current rating is 10 kA per IEC 61008-1, with a 0.5 kA rating under EN 60898. Surge current resistance is 5 kA. Type A detection catches sinusoidal AC fault currents plus pulsating DC fault currents — the standard for circuits with single-phase rectifiers, switch-mode supplies, or electronic loads. Not for pure DC fault currents (that's Type B territory).
IP20 rated with connected conductors and distribution board installed — standard for enclosed panel mounting. Finger and back-of-hand safe per the protection class. Silicon-free construction, which matters for coating and potting processes in sensitive environments.