SENTRON 3VA1225-4EF32-0AB0 — 250 A MCCB with TM240 Release
Breaking capacity scales with system voltage: 121 kA at 240 V AC, 75.6 kA at 415 V, 25 kA at 440 V, and 11.9 kA at 690 V. That SCCR headroom covers most industrial fault-current scenarios without cascading upstream breakers.
Current Rating Across Ambient Temperature
Above that, it derates linearly: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. In a hot rolling-mill panel near the furnace, that derating curve is what governs the real load it can carry — the 250 A nameplate only counts if you keep the enclosure below 50 °C.