The Siemens 5SJ4203-8HG41 is a SENTRON 5SJ4 miniature circuit breaker (MCB) with a 2-pole design and D tripping characteristic, sized for 400 V AC and 60 V DC circuits. Its 10 kA breaking capacity per EN 60898 and 15 kA per IEC 60947-2 mean it handles moderate fault currents in industrial panelboards — the higher IEC figure gives headroom for motor-starting or transformer inrush where coordination studies demand the 60947-2 rating. The D curve (10–20× In) avoids nuisance trips on high-inrush loads like small motors or solenoid banks.
IP20 with connected conductors (IP40 in the handle area) — suitable for enclosed panels; not rated for washdown. Halogen-free and silicon-free construction, sealable for tamper-proofing. Vibration resistance: 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 s).
Listed as current-production (active lifecycle stage). No official successor — this is the current catalog number.