Siemens SENTRON 3VA2440-7MN32-0CB0 is a 3-pole molded case circuit breaker rated 400 A continuous at 40 °C, with an ETU350M electronic trip unit and undervoltage release. It's the motor protection version of the 3VA2 frame.
What the ratings mean for your panel
The 400 A rating holds flat from 40 °C up to 70 °C — no derating curve to chase in a hot enclosure. The ETU350M trip unit handles motor protection curves, and the phase failure detection catches a lost leg before the motor cooks. Physical dimensions: 248 mm tall, 138 mm wide, 110 mm deep. That's a 3-pole frame that fits standard SENTRON mounting — bolt it to the backplate or mount on a DIN rail adapter. The 63.3 W max power loss matters for thermal budgeting inside a sealed enclosure; plan ventilation if you're stacking multiple breakers.