The Siemens SENTRON 3VA2340-6KP32-0CC0 is a 3-pole molded case circuit breaker rated for 400 A continuous at 40 °C through 50 °C, with a thermal derating curve that drops to 300 A at 70 °C. Its breaking capacity is 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 7.5 kA at 690 V — so it handles high-fault utility feeds on the low-voltage side and still clears moderate faults on a 690 V drive bus. The 138 mm width and 248 mm height fit standard MCCB mounting patterns in switchgear; the 110 mm depth leaves room for rear-access cabling in a typical 600 mm deep enclosure. This is a line-protection design (not motor-protection), so it's sized for feeder or main breaker duty, not individual motor starts.
Above that, drop 25 A per 5 °C step (375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, 300 A at 70 °C). If your panel ambient hits 55 °C and the load is 380 A, this breaker needs the next frame up. The 242 kA at 240 V is the headline number, but the 187 kA at 415 V is what matters for most 400 V distribution — that's still well above typical utility fault levels.
Mounts on the standard MCCB footprint in switchgear — 138 mm wide.