What this MCCB delivers
The Siemens SENTRON 3VA2225-6KP32-0DH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a maximum interrupting capacity of 242 kA at 240 V and 187 kA at 415 V. That kind of short-circuit rating means it can sit upstream of a whole subpanel or a big motor control center and still clear a bolted fault without the main breaker tripping — selectivity stays intact. The breaker is designed for line protection, not feeder or motor protection, so it's the right choice for the main incoming feed or a large distribution point. It carries a communication function for integration into a monitoring system, plus an undervoltage release (UVR) that drops the breaker if the control voltage falls — handy for safety circuits or emergency-stop chains.
Real-world interrupting and thermal performance
At 500 V the breaker still interrupts 121 kA, and at 690 V it drops to 4.5 kA — that's the arc-extinction limit at higher voltage, so if you're on a 690 V system, you need to verify the available fault current stays under that number. The continuous current derates as the ambient rises: 250 A holds steady up to 50 °C, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C. If your panel runs hot, size the breaker for the actual ambient, not the nameplate. Power loss at full load is 50.5 W — that's the heat the breaker dumps into the enclosure. In a tightly packed panel, you'll want to account for that in your thermal budget, especially if the breaker is running near its 70 °C operating limit.
Mounting and integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep — fits a standard MCCB footprint on a DIN rail or direct panel mount. The auxiliary switch block includes 2 auxiliary switches plus a trip alarm switch (HQ), and the undervoltage release is built in. No ground-fault monitoring on this version.