While the breaker is rated 400 A at 40 °C, that figure holds through 50 °C — useful for enclosures with marginal ventilation. Above 55 °C the continuous current must be reduced: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C.
Breaking capacity by voltage — selectivity planning
The 3VA2340-6HN32-0HH0 delivers 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V. The steep drop at 690 V means this is primarily a 480 V-class breaker; for 600 V-class systems verify the available fault current stays under 7.5 kA or step to a higher-rated frame.