The Siemens SENTRON 3VA2340-5HL32-0AB0 is a 3-pole molded case circuit breaker rated 400 A continuous at 40 °C, with an adjustable thermal-magnetic trip unit spanning 600 A minimum to 4000 A maximum — meaning you set the pickup point to match the downstream load, not the other way around. Interrupting capacity is the headline here: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 7.5 kA at 690 V.
Thermal derating — what the curve tells you
At 55 °C it derates to 385 A, at 60 °C to 370 A, at 65 °C to 355 A, and at 70 °C to 340 A. That 15 A drop per 5 °C step above 50 °C is the thermal bimetal responding to the internal temperature — if your panel ambient runs 60 °C, you lose 30 A of headroom. Design the enclosure ventilation accordingly.
If you need shunt trip or remote signaling, that's an add-on accessory order.