What this RCCB does and where it fits
The Siemens SENTRON 5SV3314-6KK13 is a 2-pole residual current circuit breaker (RCCB) rated for 40 A at 50 Hz, with a 30 mA trip threshold and Type A sensitivity — meaning it detects sinusoidal AC fault currents plus pulsating DC residual currents, which covers most modern electronic loads like VFDs, switched-mode supplies, and single-phase rectifiers. Its instantaneous design (no intentional time delay) trips within milliseconds of the fault exceeding 30 mA, making it the right choice for circuits where fast disconnection is needed — general socket outlets, lighting circuits, and small appliance feeds in residential or light commercial distribution boards. Rated short-circuit withstand is 10 kA per the product standard, with an IEC 61008-1 / EN 60898 conditional rating of 0.5 kA — the 10 kA figure governs the upstream backup fuse or MCB coordination; the 0.5 kA is the RCCB's own breaking capacity under those standards.
Thermal derating — what the 40 A means at panel temperature
The 40 A rating holds at 40 °C ambient. At 45 °C it derates to 38.1 A, at 50 °C to 35.59 A, at 55 °C to 32.29 A, at 60 °C to 28.19 A, at 65 °C to 23.3 A, and at 70 °C to 17.6 A. If the distribution board runs hot — adjacent high-current breakers, poor ventilation, or a sealed enclosure — the actual continuous current the RCCB can carry drops significantly. Size the upstream load accordingly.
DIN-rail footprint and panel integration
Snaps onto standard DIN rail (REG), occupies 2 modular width units (36 mm), with a depth of 70 mm and height of 90 mm. Mounting position is any orientation. Supply can enter from top or bottom. Rated IP20 once installed in the distribution board with conductors connected — the enclosure provides the environmental seal; this is a panel-internal device, not a standalone outdoor unit.