The Siemens SENTRON 3VA2225-6JQ32-0AF0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a continuous current of 250 A at 40 °C and an interrupting capacity of 242 kA at 240 V AC — enough to handle high-fault utility feeds and large transformer secondaries without cascading upstream. At 415 V and 440 V it still breaks 187 kA, and at 500 V it holds 121 kA; only at 690 V does the rating drop to 4.5 kA, which still covers most industrial motor-circuit faults.
The 250 A rating holds flat through 50 °C ambient; above that it derates to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C — a straight line that lets you size the breaker for a warm enclosure without over-speccing. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — a standard SENTRON 3VA frame that drops into existing 3VA panel cutouts and busbar layouts. Maximum power loss is 48 W, which matters for ventilation planning in sealed enclosures.