What this 3VA2325-0KQ42-0AA0 brings to the panel
The 250 A continuous rating holds from 40 °C all the way to 70 °C without derating — so it's sized for a warm enclosure where most breakers start to drop off above 50 °C. The ETU860 electronic trip unit gives you adjustable overcurrent release, a configurable N-conductor protection (switchable OFF or 20 % to 160 %), and ground-fault monitoring via summation of L + N conductors. That ground-fault scheme means the breaker sees net residual current, not just a dedicated sensor — useful on 4-wire systems where you want to catch leakage without an extra module.
Interrupting capability — what 440 kA at 415 V means
For a buyer comparing against a standard 65 kA or 100 kA MCCB: this unit sits in the ultra-high interrupt class, typically specified on the secondary side of large transformers or in heavy industrial plants where available fault current exceeds 200 kA. The 4-pole construction handles three-phase plus neutral, and the N protection is adjustable — not every MCCB gives you that flexibility.
Panel fit — dimensions and IP
Footprint is 184 mm wide by 248 mm tall by 110 mm deep — that's 7.24 in x 9.76 in x 4.33 in. It's a standard-size MCCB for a 4-pole frame; no oddball cutout needed. The front face carries IP40 protection, so it's fine inside a typical IP54 or IP65 enclosure where the door seal handles the wet side.