The Siemens 5SJ4145-7HG41 is a SENTRON 1-pole miniature circuit breaker with a C-curve trip characteristic, rated 10 kA interrupting capacity per EN 60898 and 15 kA per IEC 60947-2 at 400 V AC. At 60 V DC the same breaker handles control-circuit protection on a DC bus — common in 24 V or 48 V automation supplies, though the DC rating is a single-pole break, so it's one wire only. The IP20 rating (IP40 in the handle area) is standard for panel-mount breakers — not for wet washdown, but fine inside a sealed enclosure.
Designed for mechanical engineering and industrial environments per the manufacturer's suitability listing. The 50 m/s² vibration resistance (25–150 Hz) and 60 m/s² at 35 Hz for 4 seconds mean it holds calibration and contact pressure on a machine-tool panel or conveyor drive cabinet — not just a static distribution board. Halogen-free and silicon-free construction avoids outgassing issues near sensitive electronics or in clean-room adjacent zones. Sealable with a lead or tag (yes, the spec confirms it), which matters for applications requiring tamper-evident isolation — think safety circuits or metering points where you need to prove the breaker hasn't been reset without authorization.