Breaking capacity — what the numbers mean
The 3VA2340-6HN32-0KH0: This breaker delivers 242 kA at 240 VAC and 187 kA at 415 VAC — figures that place it in the high-interrupting-capacity class. At 690 VAC it still holds 7.5 kA, which covers most industrial motor circuits. The rating at the voltage you actually run is the one that governs fault clearance; a 400 A frame with 242 kA at 240 V means it can sit on a high-fault transformer secondary without cascading upstream.
Thermal derating — don't ignore it
The breaker carries the full 400 A up to 50 °C ambient. Above that, the thermal curve drops: 385 A at 55 °C, 370 A at 60 °C, 355 A at 65 °C, 340 A at 70 °C. If your enclosure runs hot — and many do with adjacent devices — size the frame for the derated value, not the nameplate. Operating range is -25 °C to 70 °C; storage range -40 °C to 80 °C.
Auxiliary configuration and releases
Factory-fitted with a shunt trip (STL) and two auxiliary switches plus one trip alarm switch (HQ). No undervoltage release, no ground-fault monitoring. The shunt trip lets a remote PLC or E-stop circuit open the breaker; the alarm switch signals a trip event back to the control system. No communication function — this is a standalone breaker, not a power-monitoring device.