The 5SV4644-0KL: Rated 40 A at 40 °C, with a published derating curve: 38.1 A at 45 °C, stepping down to 17.6 A at 70 °C. The 300 mA trip threshold suits it for general-purpose earth-leakage protection in distribution boards — not for personnel protection (30 mA) or fire-prevention (300 mA is borderline). Snaps onto DIN rail (REG), occupies 4 modular-width units, and can be fed from top or bottom. IP20 with conductors connected — intended for enclosed distribution boards, not open-panel washdown areas.
Fault-current ratings and selectivity
Short-circuit current rating (SCCR) is 10 kA per the main spec; the conditional rating per EN 60898 and IEC 61008-1 is 0.8 kA. That 0.8 kA figure governs coordination with the upstream protective device — the RCCB itself is not a short-circuit interruption device, so the upstream MCB or fuse must clear faults above that level. Permissible let-through energy (I²t) is 58,000 A²·s; permissible let-through current is 5,200 kA — these bound the thermal and magnetic stress the device can withstand during a fault before the upstream protector opens.
Temperature and environment
Operating ambient -25 °C to 45 °C; storage -40 °C to 75 °C. Overvoltage category III, pollution degree unspecified but typical for distribution-board installation. Silicon-free construction.
Lifecycle status is 'current' — this is an active-production part.