The Siemens SENTRON 3VA2225-5HN42-0CC0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 250 A. It's fitted with an ETU350 electronic trip unit and includes an undervoltage release (UVR) plus two HQ auxiliary switches. Breaking capacity hits 187 kA at 240 V, tapering to 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream.
Thermal performance in a hot panel
Full 250 A rating holds up to 50 °C ambient; above that it derates linearly — 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C. In a cement plant control room that sits at 55 °C near the kiln, you lose about 9 A off the nameplate. Plan the gland plate fill factor and DIN-rail spacing accordingly — the breaker itself measures 140 mm wide × 181 mm high × 86 mm deep, so it occupies a standard 4-pole MCCB footprint on the panel backplate.