The Siemens SENTRON 5SM3317-0 is a 2-pole residual current circuit breaker (RCCB) rated at 80 A on a 230 V AC, 50 Hz line. It's an instantaneous type for AC fault currents — no intentional delay, so it trips fast on a ground fault.
Full 80 A rating holds up to 45 °C ambient. Above that it derates linearly: 76.8 A at 50 °C, 73.6 A at 55 °C, 70.4 A at 60 °C, 67.2 A at 65 °C, and 64 A at 70 °C. Mounts on DIN rail (REG profile), any position, and takes 2.5 width units (about 45 mm of rail). Depth is 70 mm, so it clears a standard 80 mm deep enclosure. IP20 with conductors connected — fine inside a distribution board, not for washdown.