The Siemens SENTRON 3VA2340-5KP32-0KA0 is a 3-pole molded case circuit breaker rated for 400 A continuous current at 40 °C, which is its full-load ampacity in a typical 40 °C panel environment. That 400 A holds steady through 50 °C — at 55 °C you derate to 375 A, at 60 °C to 350 A, at 65 °C to 325 A, and at 70 °C to 300 A. So if your enclosure runs hot, the real-world ampacity drops; size your load accordingly. At 240 V it clears 187 kA — that's a very high figure, sized for large transformer secondaries or heavy industrial service entrances. At 415 V and 440 V it still handles 121 kA, at 500 V it's 75.6 kA, and at 690 V it drops to 7.5 kA. It's designed for line protection (feeder duty), not motor protection, so don't spec it for direct motor starting unless you add a separate overload relay.
Built-in trip unit and accessories
The breaker does include a communication function, so it can report status and accept remote commands over a fieldbus or network, which saves running separate control wires for the shunt trip. The supplied basic switch inside is order code 3VA2340-5KP32-0AA0 — that's the internal switching mechanism. Power loss is listed at a maximum of 96 W, which is the heat the breaker dumps into the enclosure at full rated current; factor that into your panel's thermal budget.