MCCB for line protection — 250 A frame, ETU320 trip unit
The Siemens 3VA2225-6HL32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a 3-pole configuration and an ETU320 electronic overcurrent release.
Thermal derating and ambient limits
Above that, it derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C.
