The Siemens SENTRON 5SM3647-4 is a 4-pole RCCB rated 80 A at 400 V AC, 50/60 Hz, with a 300 mA Type B residual current trip. The short-time delayed design provides selectivity with downstream RCCBs.
Snap-on DIN rail (REG) mounting, 4 modular-width units wide (72 mm). Depth is 77 mm; installation depth 70 mm. Mounting position is unrestricted — horizontal, vertical, or inverted all within spec. Silicon-free construction suits environments where silicone outgassing can contaminate contacts or optics.
Derate linearly above that: 76.8 A at 50 °C, 73.6 A at 55 °C, 70.4 A at 60 °C, 67.2 A at 65 °C, 64 A at 70 °C. For a panel running warm (say 50 °C interior), the continuous load should be kept under 77 A per pole — the derating curve is the real limit, not the nameplate 80 A.