SENTRON 3VA2225-5HN42-0DL0 — 250 A, 4-Pole MCCB with ETU350 Trip Unit
The ETU350 electronic trip unit manages overcurrent and short-circuit response, with a maximum power loss of 50.5 W at rated load. Breaking capacity is voltage-dependent: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. Thermal derating begins above 50 °C ambient: the breaker carries 250 A continuously up to 50 °C, then drops to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. For a panel running near its upper temperature limit, this curve governs whether the breaker can hold the load without nuisance tripping.
Physical Fit and Auxiliary Configuration
The width is the critical panel-space dimension for multi-breaker lineups — confirm the mounting footprint against the existing switchboard cutout or DIN-rail adapter plate.