Siemens 3VA2225-0HM42-0AA0 — 250 A SENTRON MCCB with ETU330 Trip Unit
The ETU330 trip unit provides adjustable long-time pickup (Ig) from 50 A to 250 A, and the N-conductor protection is configurable to OFF, 50%, or 100% of the phase current. This makes the breaker suitable for systems requiring selective coordination or where neutral protection must match the load profile.
Breaking Capacity and Derating
Rated breaking capacity is 440 kA at 415 V and 187 kA at 690 V — figures that place this MCCB in the high-interrupting category for large industrial feeds or transformer secondaries where fault current can exceed 200 kA. Current rating 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.
An optional motor drive is available for remote operation. Maximum power loss is 48 W at rated current — factor this into the panel thermal budget.