The 5SY4103-8CC: The D-curve characteristic means the breaker tolerates high inrush currents typical of motor loads, transformers, or capacitive banks — it trips between 10× and 20× rated current, so it won't nuisance-trip on a compressor start. The 10 kA breaking capacity (per EN 60898) at 400 V AC is the maximum fault current it can safely interrupt; for UL 1077/CSA C22.2 No.235 installations, that figure is 5 kA. Rated operating voltage is 400 V AC (440 V max single- or multi-phase), and it also carries a DC rating of 72 V max.
Mounting position is any, which helps in tight enclosures. The breaker is sealable for tamper-proof applications. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.