The Siemens 5SJ4102-8HG42 is a 1-pole SENTRON miniature circuit breaker with a D tripping curve, rated 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. Rated 60 V DC (maximum), this pole can switch DC control circuits or small DC bus feeds, but the 1-pole format limits it to ungrounded or single-load DC applications — not for bipolar DC systems. The 95% humidity tolerance at max temperature is standard for non-condensing indoor environments.
Mounting, wiring, and panel fit
Width is 18 mm (1 modular unit), depth 70 mm, height 121 mm. IP20 with connected conductors, IP40 in the handle range — sufficient for enclosed panel mounting; handle area is protected against tools. Vibration resistance tested at 50 m/s² over 25–150 Hz and 60 m/s² at 35 Hz for 4 seconds, which covers most industrial machine vibration profiles.