The Siemens SENTRON 3VA2225-6KQ32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a full-scale setting range from 50 A to 250 A. Its headline breaking capacity hits 242 kA at 240 V AC — that's the fault current it can safely interrupt without welding contacts or rupturing the case, which means it handles high-fault utility feeds or transformer secondaries where upstream coordination demands a robust interrupt rating.
Breaking capacity across voltages — what the numbers mean for your panel
This MCCB delivers 242 kA at 240 V, 187 kA at both 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. The steep drop at 690 V tells you the internal arc-extinction design is optimized for the 400–500 V range typical of industrial distribution. If your system runs 690 V, verify the available fault current stays under 4.5 kA — otherwise you need a current-limiting upstream device or a higher-rated frame.
Thermal derating — the real-world current you can count on
Rated 250 A at 40 °C, 45 °C, and 50 °C without derating. Above that: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. For a panel that sees 55 °C ambient (common in sealed enclosures or near heat sources), you lose 12 A — plan your load margin accordingly. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Mounting and integration — panel fit and connections
Dimensions are 181 mm height, 105 mm width, 86 mm depth. It's a standard MCCB footprint for a 3-pole frame at this rating — mounts on a DIN rail or directly to a backplate via the base slots. The shunt trip release (STL) is built in, so you can wire a remote trip from an E-stop or safety relay without adding an external module. Communication function is present on this variant, meaning it can report status or accept remote commands over a bus — check the specific protocol (PROFIBUS, PROFINET, or Modbus) against your control network.