The Siemens 5SV3647-6KK01 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON series, rated at 80 A with a 300 mA residual operating current and a 400 V AC supply voltage.
Rated at 80 A continuous (hot operating state), this RCCB handles the full load current of a sub-distribution board feeding mixed lighting, socket, and small-power circuits. The 300 mA residual sensitivity is the standard for fire protection in many IEC 60364 installations — it won't nuisance-trip on normal cable leakage but will clear a ground fault before cable insulation degrades to a fire risk. The short-time delayed characteristic (0.8 kA rated conditional short-circuit current per IEC 61008-1) lets it coordinate with an upstream MCB or fuse: the RCCB rides through the inrush of a downstream short-circuit so selectivity is maintained. The 4-pole design (3L + N) suits three-phase four-wire systems up to 400 V line-to-line. Storage down to -40 °C is fine for unheated warehouses. The IP20 rating (with conductors connected and distribution board installed) is standard for enclosed panel-mount devices — no special sealing required inside the cabinet.