The Siemens 5SM3347-6 is a 4-pole SENTRON residual current circuit breaker (RCCB) — instantaneous trip, Type A, rated 80 A at 40 °C and 30 mA residual sensitivity. Type A detects AC residual currents plus pulsed DC, covering most single-phase rectified loads like switching power supplies and LED drivers.
Snaps onto DIN rail (REG profile) in any orientation — mounting position any. Depth is 77 mm; installation depth 70 mm. Supply can enter from top or bottom.
Derates linearly above 45 °C: 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. Operating ambient -25 °C to +45 °C; storage -40 °C to +75 °C. The thermal curve governs continuous load — if your panel ambient runs 50 °C, plan for 76.8 A max continuous.