The Siemens 5SV3657-6 is a SENTRON residual current circuit breaker (RCCB) rated 80 A with a 300 mA tripping fault current, Type A sensitivity, and 4-pole construction. It is an instantaneous (non-delayed) design, meaning it trips without intentional time delay on a ground fault — suited for general-purpose protection where selectivity with downstream devices is not required. Rated short-circuit current withstand is 10 kA per IEC 61008-1, with a conditional rating of 0.8 kA per EN 60898. The I²t let-through is 110 000 A²·s, and surge current resistance is rated at 1 kA (8/20 µs waveform). These ratings define the device's ability to clear a fault without damage and ride through lightning-induced surges on the line side.
Thermal derating and mounting
Full 80 A rating holds at 40 °C ambient. At 45 °C the continuous current derates to 77.57 A, dropping to 48.8 A at 70 °C. If the panel ambient runs warm — common in a crowded DIN-rail enclosure — size the upstream protective device for the derated value at your actual cabinet temperature. Mounts on DIN rail (REG) and occupies 4 modular width units (72 mm). Depth is 70 mm, height 90 mm. Feed from top or bottom; mounting position is unrestricted. The housing is IP20 with conductors connected — standard for enclosed distribution boards, not for wet or dust-exposed locations.