It delivers 330 kA breaking capacity at 240 V AC, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V — numbers that tell you it is sized for high-fault-current main feeders in industrial switchboards, not branch circuits.
The 400 A rating holds flat from 40 °C through 50 °C ambient (-), then derates to 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C (-). Breaking capacity at 690 V is 52.5 kA — enough for most 690 V industrial networks, but verify against your transformer impedance and fault study.
Front-face protection is IP40, suitable for dry indoor switchgear; no washdown rating. Max power loss is 96 W; factor that into enclosure thermal rise calculations.