What this 3VA2340-6HN32-0KA0 brings to the panel
The interrupting ratings are serious: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V. The ETU350 trip unit gives you adjustable long-time, short-time, and instantaneous protection curves, plus ground-fault capability if you add the right module (this variant ships without ground-fault monitoring). That's the standard electronic trip for this frame size — field-adjustable, so you can coordinate with downstream breakers on site.
Thermal derating — the number that matters in a real panel
The 400 A rating holds at 40 °C, 45 °C, and 50 °C — no derating needed in a typical 40 °C switchroom. At 55 °C it drops to 385 A, at 60 °C to 370 A, at 65 °C to 355 A, and at 70 °C to 340 A. If you're packing this into a non-ventilated enclosure or a hot corner of a MCC lineup, that's the curve to size against. Maximum power loss is 96 W — not trivial; that heat has to leave the enclosure. Factor it into your thermal budget if you're stacking multiple 400 A frames in one section.
Auxiliaries and accessories — what's on board
The basic switch assembly is order code 3VA2340-6HN32-0AA0, and the integrated auxiliary trip module is 3VA9688-0BL32 — useful to know if you're stocking spares or replacing a damaged subassembly in the field. No undervoltage release on this variant, and no communication module or phase-failure detection built in.
Mechanical endurance is 15,000 operations — that's typical for a fixed-mounted MCCB in a distribution board, not a switching-duty contactor. The trip indicator and voltage trigger are both present, which helps during commissioning troubleshooting.