What this MCCB does on the line
It carries an ETU320 electronic overcurrent release, so the trip curve is adjustable — you set the long-time pickup and short-time delay to coordinate with downstream breakers or fuses. That kind of SCCR headroom makes it a good fit for the main or feeder position in a panel where fault current is high.
The 400 A rating holds up to 50 °C ambient. Above that it starts to step down: 384 A at 55 °C, 376 A at 60 °C, 368 A at 65 °C, and 360 A at 70 °C. The maximum power loss is 66 W, which adds to the enclosure heat load. Mounting it with some breathing space around the vents helps keep the internal trip unit cool.
Built-in undervoltage release and auxiliary contacts
The auxiliary contacts give you status feedback: open/closed indication back to the PLC or a remote panel.
Physical fit in the panel
That's a standard SENTRON 3VA2 frame size — it bolts onto a mounting plate or a DIN rail adapter. Terminal layout follows the usual line-top / load-bottom convention; busbar kits and cable connectors are available from the same SENTRON accessory range.