The breaker carries a full 400 A up to 50 °C ambient, then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. For a panel that runs at 55 °C — common in a packed switchroom — you lose 25 A of headroom. If your load is a 380 A continuous draw and the enclosure hits 60 °C, the 350 A rating means you need a larger frame or forced ventilation.
The breaker measures 110 mm deep, 138 mm wide, and 248 mm tall.
Auxiliary and communication options
It does not include an undervoltage release or phase failure detection. Maximum power loss is 96 W — account for that in enclosure thermal calculations.