The Siemens 5SY4106-7CV is a 1-pole miniature circuit breaker (MCB) with a C-curve trip characteristic, rated 6 A at 230/400 V AC and a breaking capacity of 15 kA per IEC 60947-2. That puts it in the industrial-control-panel class — not just residential final circuits.
Nacelle-ready: temperature and vibration
That's the full nacelle envelope — cold start on a North Sea winter morning through summer heat soak under the canopy. No up-tower swaps needed for ambient extremes. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz. That's the shake a pitch-drive cabinet sees on a 2 MW turbine. It takes the shake. Humidity derating is specified: max 95% RH up to 55 °C, then 55% up to 70 °C, 35% up to 75 °C. If the panel breathes coastal air, the rating holds.
18 mm wide, one modular unit. Snaps onto any DIN rail, any mounting position. Combined terminal top and bottom. Spring-cage or screw? The spec calls it combined — accepts the same conductor range top and bottom, no special feed-through lug needed. Quick assembly system for ganging multiple poles. IP20 with connected conductors. Fine inside a sealed IP54 or IP65 cabinet; not for open-panel washdown.
Thermal derating — real-world current
Full 6 A rating holds at 35 °C ambient. At 40 °C it's 5.56 A, at 45 °C 5.33 A, at 50 °C 5.1 A, at 55 °C 4.82 A.