What this 250 A MCCB delivers
Breaking capacity hits 187 kA at 240 V, 121 kA at 415 V, 36 kA at 440 V, and 17 kA at 690 V — that's serious fault-interruption headroom for a 250 A frame, meaning it can ride through high-fault scenarios without cascading upstream gear.
Thermal derating and real-world loading
At 55 °C it drops to 243.3 A, at 60 °C to 236.5 A, at 65 °C to 229 A, and at 70 °C to 223 A. That's a 2.7 % reduction — not a showstopper, but worth noting in the load schedule.
Built-in auxiliaries and release options
Dimensions are 70 mm deep, 140 mm wide, 158 mm tall — a standard 4-pole MCCB footprint that bolts into a SENTRON 3VA mounting base or panel-mount kit. Front protection is IP40, so it's fine in a closed enclosure but not washdown-rated. If you need those extras, you're looking at a different 3VA variant.