It carries a maximum breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V — the SCCR headroom at lower voltages is substantial, meaning this breaker can handle high-fault utility feeds or transformer secondaries without cascading upstream. The 400 A rating holds flat from 40 °C through 50 °C, 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 warm — say 55 °C ambient inside the enclosure — the breaker is good for 375 A continuous, not the full 400 A. That derating curve is the spec to check before committing the BOM line.
Panel Fit and Internal Accessories
The base switch is order code 3VA2340-5JP32-0AA0.