The Siemens SENTRON 5SV3414-6 is a 2-pole residual current circuit breaker (RCCB) rated for 40 A at 50 Hz, with a 100 mA trip threshold and Type A sensitivity. It handles a 10 kA short-circuit current rating and fits a standard 2-module DIN-rail footprint (36 mm wide).
The 40 A rating holds at 40 °C ambient; at 45 °C it derates to 38.1 A, and at 60 °C it drops to 28.19 A. If your panel runs warm, size the upstream breaker accordingly — the 40 A nameplate is only valid at 40 °C. Type A detection covers pulsating DC residual currents up to 100 mA, which is the standard for single-phase electronics and variable-speed drives. The instantaneous design means no intentional delay — it trips within the RCD curve, not the S-curve. Not a daily-switch application.
Snaps onto DIN rail (REG), any mounting position. Depth is 70 mm, width 36 mm (2 MW), height 90 mm. IP20 with the distribution board installed and conductors connected.