The Siemens 3VA2340-5JQ32-0AF0 is a SENTRON molded case circuit breaker (MCCB) rated 400 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. At 415 V it still holds 121 kA, and at 690 V it drops to 7.5 kA, so the voltage-dependent curve governs where you place it in the distribution. Three poles, line-protection design (not motor-protection), with a built-in communication function for remote monitoring or trip-event capture.
Thermal derating — the real-world current you can actually carry
Above that it derates: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. The maximum power loss at rated load is 96 W, so factor that into your enclosure heat budget.
Footprint and panel integration
That 110 mm depth means it fits standard 200 mm deep enclosures without crowding the gland plate.