The Siemens SENTRON 3VA2340-6JP32-0KH0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with a maximum breaking capacity of 242 kA at 240 V AC. At 415 V and 440 V it still holds 187 kA, and at 500 V it delivers 121 kA, so it covers most industrial distribution voltages with headroom. The 690 V rating drops to 7.5 kA, which is typical for a 400 A frame at that voltage — plan coordination accordingly if your system runs 690 V. It lacks an undervoltage release and ground-fault monitoring as shipped. It carries a shunt trip (STL) and two auxiliary switches plus a trip alarm switch HQ.
Thermal derating — the real-world current curve
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.
It's a 3-pole fixed-mount MCCB designed for panel or switchgear mounting — not a plug-in base.