The 400 A rating holds steady through 50 °C; above that, it derates to 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C, so a warm enclosure or high-ambient panel needs that curve checked against the actual load. Interrupting capacity is the headline here: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 11.9 kA at 690 V.
Panel integration
The 3-pole breaker measures 110 mm deep, 138 mm wide, and 248 mm tall — a standard SENTRON 3VA frame footprint. It mounts directly on a DIN rail or via screw-mount lugs in a distribution panel.