Siemens 3VA2225-6KP32-0KC0 — 250 A SENTRON MCCB with Communication
The Siemens 3VA2225-6KP32-0KC0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a 3-pole configuration and an adjustable thermal-magnetic trip unit covering 375 A to 2 500 A. This is the line-protection variant, designed for main feeder or large subfeed applications in distribution panels where high fault current capacity is required. Breaking capacity is the headline spec here: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 4.5 kA at 690 V. The 250 A rating holds flat from 40 °C through 50 °C, then derates linearly to 200 A at 70 °C. In a warm panel enclosure, that derating curve is what governs the real-world ampacity — don't size to the 250 A nameplate unless you can keep ambient below 50 °C.
Power dissipation is 48 W maximum at rated load. That's the heat you need to vent in a sealed enclosure — factor it into your thermal budget alongside other devices in the same compartment. The base switch is order code 3VA2225-6KP32-0AA0.