What this MCCB delivers
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.
Thermal derating and panel fit
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.
Lifecycle and sourcing
It carries a communication function and is fitted with one auxiliary switch plus one trip alarm switch (HQ), matching the basic switch variant 3VA2225-6JQ32-0AA0.