The 5SY8414-8: Rated breaking capacity reaches 70 kA at AC per IEC 60947-2, with 15 kA at DC per the same standard, and 5 kA at AC per UL 1077 and CSA C22.2 No.235. The D curve (10–20× In) suits high-inrush loads like motor starters and transformers, where the MCB must ride through the starting surge without nuisance tripping.
Thermal derating and environmental range
Rated current holds at 0.3 A up to 45 °C, then derates to 0.29 A at 50 °C and 0.28 A at 55 °C.
IP20 protection applies with connected conductors; touch protection is integrated. Vibration resistance per IEC 60068-2-6 covers ±1 mm at 5–25 Hz and 50 m/s² at 25–150 Hz.