The Siemens SENTRON 3VA2340-5HL32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 400 A continuous current at 40 °C, with the ETU320 electronic trip unit handling overcurrent protection. It carries a breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — figures that tell you this breaker is sized for high-fault industrial distribution, not light commercial. The shunt trip (STL) design allows remote tripping via a voltage trigger, which is useful for emergency-off or interlock circuits.
The 400 A rating holds flat from 40 °C through 50 °C, then steps down: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, and 340 A at 70 °C.