Its D tripping characteristic — 10 to 20 times rated current — is sized for high-inrush loads: motor starters, transformers, or welding equipment where a B- or C-curve would nuisance-trip on startup. The 50 A rating at 45 °C (48.75 A at 50 °C, 47.45 A at 55 °C) means you size the breaker for the actual ambient in the enclosure, not the nameplate. Breaking capacity is 20 kA per IEC 60947-2 (15 kA DC, 5 kA per UL 1077/CSA C22.2 No. 235) — enough for most industrial panelboards with a 10 kA or higher available fault current at 400 V.
Rated per IEC 60947-2 and UL 1077/CSA C22.2 No. 235. Halogen-free and silicon-free construction. Sealable for lockout/tagout. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz.