Siemens SENTRON 3VA2225-0HL42-0AA0 — 250 A MCCB with ETU320, 440 kA at 415 V
Its headline rating is 250 A continuous current at 40 °C, with a massive 440 kA breaking capacity at 415 V AC — that means it can safely interrupt fault currents up to 440 kA without upstream cascading, critical for high-fault installations like transformer secondaries or large motor control centers.
The continuous current holds at 250 A from 40 °C through 50 °C, then derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C.
The ETU320 electronic trip unit allows adjustable N-conductor protection (OFF, 50%, 100%) and the breaker has no undervoltage release, no voltage trigger, and no ground-fault monitoring built in — those are external accessories if needed.