The Siemens SENTRON 3VA2440-6HN32-0KH0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, with the ETU350 electronic trip unit handling the overcurrent protection logic.
At 55 °C it derates to 384 A, then 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. Maximum power loss is 63.5 W, which matters for thermal management in a sealed cabinet.
This MCCB's interrupting rating drops as system voltage climbs: 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. At 690 V the 40 kA still covers high-impedance secondary circuits.
The 110 mm depth leaves room for rear-connected bus bars or a cable exit box behind the breaker.