That 400 A holds steady at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C (through), so if your panel runs hot near a motor starter lineup, this breaker doesn't force a downsized cable or a bumped frame size. Interrupting capacity is what separates this from a standard distribution breaker: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V (through). At 240 V that's a 187 kA rating — enough for high-fault infrastructure like a large industrial service entrance or a motor control center fed by a big transformer.
There's no undervoltage release and no communication module, so this is a straight thermal-magnetic or electronic-trip MCCB — no fieldbus, no remote open/close. Keep that in mind if the spec called for a communicating breaker. The 110 mm depth means it clears a 120 mm deep enclosure without the cover bulging.
The supplied basic switch order code is 3VA2440-5MN32-0AA0 — that's the bare breaker without the auxiliary contact block. The -0KL0 suffix on the seed code adds the HQ auxiliary contact set. If you already have a panel with the -0AA0 and need the alarm contacts, you can swap the auxiliary block rather than replace the whole breaker. Maximum power loss is 63.5 W. That's the heat the breaker dumps into the enclosure at full rated current. In a sealed panel with multiple breakers, that heat adds up — factor it into the ventilation or derating calculation if the ambient inside the enclosure climbs toward the 70 °C operating max.