Siemens SENTRON 3VA1225-4GE42-0AA0 — 250 A MCCB, 4-Pole, TM220 Trip Unit
At 240 V it interrupts up to 121 kA; at 415 V that figure drops to 75.6 kA, at 440 V to 52.5 kA, at 500 V to 17 kA, and at 690 V to 11.9 kA. Those are the numbers that decide whether this breaker holds on a high-fault transformer secondary or needs an upstream current-limiting device. The thermal derating curve is published: full 250 A up to 50 °C ambient, then 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C.
Dimensions are 158 mm height, 140 mm width, 70 mm depth. The 140 mm width is standard for a 4-pole MCCB in the SENTRON 3VA frame — it occupies the same panel footprint as other 4-pole 3VA breakers in the 250 A class.