RCCB for 230/400 V AC networks — Type A, 63 A, 300 mA
The Siemens SENTRON 5SV3646-6BA is a 4-pole residual current circuit breaker (RCCB) designed for 230/400 V AC supply, rated 63 A at 40 °C and tripping on a 300 mA residual current. Rated short-circuit capacity is 10 kA per IEC 61008-1, with a conditional rating of 0.8 kA under EN 60898.
Depth is 70 mm. Silicon-free construction avoids outgassing issues in coating or potting processes.
Thermal derating and selectivity
Rated current holds at 63 A from 40 °C through 60 °C ambient. At 65 °C it derates to 57.35 A; at 70 °C to 48.84 A. The flat thermal curve up to 60 °C gives headroom in warm panels — no need to oversize for typical enclosure temperatures. Permissible let-through energy is 110 000 A²·s, and surge current withstand is rated at 1 kA. These figures support coordination with upstream MCBs — the RCCB will ride through short-duration surges without nuisance tripping.