400 A MCCB with ETU560 — line protection for high-fault panels
The Siemens SENTRON 3VA2340-5JQ32-0KA0 is a 3-pole molded case circuit breaker rated 400 A continuous current at 40 °C, with a maximum interrupting capacity of 187 kA at 240 V AC. The integrated shunt trip (STL) allows remote tripping from a PLC or emergency-stop circuit, and the communication function supports integration into a monitoring system — useful for a plant floor where you want to log trip events or reset remotely. The 3VA2340 frame is built for line protection (not just feeder), meaning it's the primary overcurrent device for a bus or a large motor control center.
The breaker holds 400 A continuously up to 50 °C ambient. Above that, it derates: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. If your panel runs hot — near a furnace line or in a non-conditioned electrical room — factor that derating into your load calculation. The 110 mm depth leaves room for rear-connection bus bars in a typical 600 mm deep enclosure.