What the interrupting ratings mean for your coordination study
The continuous current rating holds at 400 A from 40 °C through 50 °C (–), then derates to 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. That derating curve is the one that governs the real panel loading, not the frame size.
The breaker measures 248 mm high by 138 mm wide by 110 mm deep (–). The 138 mm width (5.43 in) for a 3-pole frame is typical for this class; verify the mounting footprint against the existing panel cutout or DIN-rail adapter if retrofitting into an older board.
Built-in undervoltage release and communication
This means if the control voltage feeding the UVR coil drops below its dropout threshold, the breaker trips — standard for applications where a loss of control power must also disconnect the load (e.g., emergency stop circuits or safety-related disconnects). A communication function is present, which allows integration with a higher-level monitoring or SCADA system for trip status and load data. The basic switch variant is listed as 3VA2340-6JQ32-0AA0, confirming this -0CA0 suffix carries the UVR and communication options.