The Siemens SENTRON 3VA2340-6KP32-0AC0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C ambient, with the same rating holding at 45 °C and 50 °C — that's a solid thermal margin for most panel environments. At 55 °C it derates to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A, so you can push it into a warm cabinet as long as you account for the curve. Breaking capacity is 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V — that's a high-interrupting frame that handles utility-grade fault levels without cascading upstream. Communication function is built in, so it talks to your plant monitoring system for power metering and trip event logging. The 2 auxiliary switches HQ give you status feedback to the PLC without an add-on module.
No special cutout or adapter plate needed for a typical MCC bucket or distribution panel. Maximum power loss is 96 W — factor that into your panel thermal calculation if you're stacking multiple breakers in a sealed enclosure. The storage minimum matters if this sits in an unheated warehouse before install.
Latching endurance is 15,000 operations — the mechanical life before the mechanism wears. For a main feeder breaker that cycles once a day, that's over 40 years.