What the ratings mean for fit
The Siemens SENTRON 3VA2340-6KP32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with the same rating holding through 50 °C. Above that, it derates linearly to 300 A at 70 °C — so if your panel ambient runs hot, the effective continuous current drops. The interrupting ratings are what drive the selectivity study: 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. That 690 V figure is the one to watch — it's a steep drop, so verify the available fault current at that voltage before committing the BOM line.
Integration and panel fit
The 3VA2340-6KP32-0DH0 mounts on a DIN rail or panel-mount base. Dimensions are 248 mm high, 138 mm wide, and 110 mm deep — fits a standard MCCB slot in a SENTRON distribution board or a standalone enclosure. It ships with an undervoltage release (UVR) and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ design). The basic switch assembly is order code 3VA2340-6KP32-0AA0, which is the core switching mechanism; this variant adds the UVR and communication function on top.