What it is and what it does
The Siemens 3VA2225-6KP32-0HA0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, designed for line protection in distribution panels. Its interrupting capacity reaches 242 kA at 240 V AC and 187 kA at 415 V and 440 V — numbers that tell you it handles high-fault-current scenarios like transformer secondaries or large motor branch circuits without cascading upstream. The breaker includes a shunt trip release (STL) and a communication function, so it can be remotely tripped and integrated into a building management or industrial control system.
Rating so-what: thermal derating and interrupting capacity
The 250 A rating holds steady from 40 °C through 50 °C, then derates 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 ambient runs above 50 °C, size the continuous load against the derated figure, not the nameplate. The interrupting curve drops sharply at 690 V to 4.5 kA — this breaker is not your go-to for 690 V high-fault applications; at that voltage, the 121 kA at 500 V is the realistic ceiling for heavy-duty service.
Panel fit and dimensions
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep. That 86 mm depth is the dimension to check against enclosure clearance — it fits standard MCCB mounting footprints in SENTRON and most third-party distribution panels. The 3-pole block occupies three module spaces on a DIN rail or bolted bus.