The SENTRON 5SM3317-6KK12 is a 2-pole residual current circuit breaker (RCCB) from the 5SM3 series, rated 80 A at 40 °C and 230 V AC, with a 30 mA trip threshold and Type A fault current detection. The 70 mm depth matches standard distribution board cutouts — no extra clearance needed behind the panel.
Thermal derating and conductor sizing
Full 80 A rating holds up to 45 °C ambient; above that it steps down 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.
Installation notes
Mounting position is any — no orientation restrictions on the DIN rail. Supply connects at the bottom terminals. Rated surge current resistance is 1 kA, and the I²t withstand is 70 000 A²s, so it handles typical inrush without nuisance tripping.