250 A SENTRON MCCB with undervoltage release
Breaking capacity runs from 187 kA at 240 V down to 17 kA at 690 V, so it handles high-fault utility feeds at the lower voltages typical of North American 240/277 V split-phase or 480 V distribution, and still clears a 17 kA fault on a 690 V industrial bus. Above that the curve drops to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C.
The 3VA1225-5GF42-0BA0 measures 140 mm wide by 158 mm tall by 70 mm deep — a standard 4-pole MCCB footprint for DIN-rail or rear-panel mounting in a SENTRON distribution board. The 59.5 W maximum power loss means the enclosure needs some ventilation or forced air if the breaker is continuously loaded near 250 A alongside other high-current devices. The undervoltage release is factory-integrated — no separate auxiliary module to mount and wire, saving a DIN position.