The Siemens SENTRON 3VA1225-5EF32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 250 A at 40 °C ambient.
Breaking capacity drops as voltage rises: 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V. That means this breaker is sized for 400 V-class distribution where the fault current stays under 120 kA; at 690 V the 17 kA limit still covers most industrial motor-control panels. The continuous rating holds at 250 A from 40 °C up to 50 °C, then derates to 243 A at 55 °C and 223 A at 70 °C.
Integration notes
Dimensions: 105 mm wide, 158 mm high, 70 mm deep. That's a standard 3-pole MCCB footprint for a 250 A frame — it fits a typical DIN-rail or panel-mount enclosure with a 105 mm cutout. Rated insulation voltage is 800 V, so it's fine for 480/600 V systems with margin. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C.