What it is and what it does
The Siemens 5SV3417-6 is a 2-pole residual current circuit breaker (RCCB) from the SENTRON family, rated 80 A at 50 Hz with a 100 mA trip threshold and Type A waveform sensitivity. The 100 mA rating means it detects sinusoidal AC faults plus pulsating DC faults — the type of leakage you get from half-wave rectified loads like switching power supplies or variable-speed drives. The 10 kA short-circuit current rating (SCCR) per IEC 61008-1 tells you it can safely interrupt a fault up to that level without welding contacts or cascading upstream; the EN 60898 rating of 0.8 kA is the lower conditional rating for the same device under that standard's test sequence.
Mounting and integration
Snaps onto standard 35 mm DIN rail (REG) — two modular width units (36 mm wide) — and can be mounted in any orientation. Depth is 70 mm, which matches the typical SENTRON enclosure depth; no extra clearance needed behind the rail. Supply can enter from top or bottom, which simplifies busbar routing in a crowded panel. The IP20 rating is only valid with the distribution board installed and conductors connected — treat it as panel-internal only, not for exposed or washdown locations.
Thermal derating and operating limits
The 80 A rating holds at 40 °C ambient. Above that, the device derates: 77.87 A at 45 °C, 74.77 A at 50 °C, 70.26 A at 55 °C, 64.32 A at 60 °C, 56.96 A at 65 °C, and 48.2 A at 70 °C. If your panel ambient runs hot — say 50 °C inside a sealed enclosure — you need to account for the 74.77 A continuous limit, not the nameplate 80 A. Operating ambient range is -25 °C to 45 °C; storage range extends from -40 °C to 75 °C.