It carries a maximum breaking capacity of 242 kA at 240 V AC, dropping to 187 kA at 415 V and 121 kA at 500 V — sufficient for high-fault industrial distribution panels where upstream transformer capacity is large.
At 40 °C the breaker carries its full 400 A; derating begins above 55 °C, reaching 385 A at 55 °C and 340 A at 70 °C. Maximum power loss is 98.5 W — a figure to consider when calculating enclosure heat rise, especially in a sealed panel with multiple breakers. Panel placement should avoid direct adjacency to high-heat sources (transformers, VFDs) to stay within the derating curve.