The Siemens SENTRON 3VA2340-5HL32-0DC0 is a 3-pole molded case circuit breaker rated 400 A continuous at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V. At 415 V and 440 V the SCCR holds at 121 kA; at 690 V it drops to 7.5 kA, so for 690 V applications verify the available fault current stays under that threshold. The continuous current rating is flat at 400 A from 40 °C through 50 °C, then derates linearly to 340 A at 70 °C. That thermal curve is the one that governs real-world panel loading — if your enclosure ambient runs at 60 °C, plan for 370 A, not 400 A.
The breaker measures 248 mm high by 138 mm wide by 110 mm deep — a standard footprint for a 400 A frame in the SENTRON 3VA platform. It mounts via four screws to a backplate or DIN-rail adapter (not included); the 138 mm width leaves room for side-by-side mounting in a multi-breaker lineup, though thermal derating should be recalculated when breakers are ganged without spacing. Maximum power loss is 98.5 W at rated load — that heat must be vented or accounted for in the enclosure's thermal budget.