The Siemens SENTRON 3VA2340-6KP32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, configured for line protection with an ETU850 electronic trip unit.
The 400 A rating holds flat from 40 °C to 50 °C, then derates linearly to 300 A at 70 °C. If your enclosure ambient runs above 50 °C, you lose 25 A per 5 °C step — plan the thermal budget accordingly.
Communication and auxiliary contacts
Account for handle throw and rear terminals when sizing enclosure depth.