Its interrupting capacity hits 242 kA at 240 V AC and still holds 187 kA at 415 V and 440 V, dropping to 121 kA at 500 V and 7.5 kA at 690 V — so on a 480 V wye service you've got serious fault-current headroom for high-capacity feeds. The 400 A frame means it's sized for main or large feeder breakers, not branch circuits.
Derating and thermal reality
At 55 °C it derates to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A. Plan the load accordingly or oversize the frame. Maximum power loss is 98.5 W, which adds to the enclosure heat budget.
That means you get remote status indication and undervoltage protection without adding external relays. Communication function is present, so it can talk to a BMS or PLC for power monitoring. The basic switch is order code 3VA2340-6KP32-0AA0 — the UVR and aux switches are factory-integrated, not field-addable on this SKU.
It's a panel-mount MCCB — no DIN rail, so plan for bolt-on bus bars or cable lugs. The trip indicator is present, which helps during troubleshooting: you see a mechanical flag or button pop when the breaker trips on overcurrent or short circuit.