What the ratings mean for your panel
The 3VA2340-5KQ32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with a full-scale value of 400 A and an adjustable thermal-magnetic trip range from 80 A to 400 A. That 400 A continuous rating holds flat through 50 °C — only starts derating at 55 °C (375 A) and drops to 300 A at 70 °C, so in a warm enclosure you still have headroom. The interrupting capacity is the headline: 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 500 V, and still 7.5 kA at 690 V. That means it can clear a fault at full rated current without cascading upstream — critical for selective coordination on a main or feeder breaker. Three-pole, line-protection design, with communication function for remote monitoring or trip-event capture.
Sizing and thermal reality
Rated insulation voltage is 800 V, so it's comfortable on 480/600 V class systems. Max power loss at rated load is 96 W — that's the heat you need to vent from the enclosure. The breaker is rated for operation from -25 °C to 70 °C ambient and storage from -40 °C to 80 °C. Dimensions: 248 mm high, 138 mm wide, 110 mm deep — fits standard panel-mount cutouts for this frame size.