SENTRON 3VA2225-7KP32-0AF0 — 250 A MCCB with 330 kA interrupting capacity
The Siemens SENTRON 3VA2225-7KP32-0AF0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a maximum interrupting capacity of 330 kA at 240 V AC. That 330 kA figure at 240 V means it can safely clear a fault current up to that level without cascading damage upstream — critical for high-fault installations like transformer secondaries or large motor control centers. At 415 V and 440 V the interrupting rating holds at 242 kA, dropping to 187 kA at 500 V, and 4.5 kA at 690 V. The breaker is designed for line protection, includes a communication function for integration into monitoring systems, and comes with one auxiliary switch plus one trip alarm switch (HQ type).
Thermal derating and operating range
The 250 A rating holds flat from 40 °C through 50 °C — no derating needed in typical panel ambient. Above 50 °C the continuous current steps down: 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C (the maximum operating temperature). Minimum operating temperature is -25 °C; storage range extends from -40 °C to 80 °C. Maximum power loss is 48 W at rated load, which factors into enclosure ventilation sizing.
Panel integration and dimensions
Dimensions: 105 mm wide, 181 mm high, 86 mm deep. The 86 mm depth is the dimension behind the panel face — check gland plate clearance if retrofitting into a shallow enclosure. The breaker carries a trip indicator for visual fault confirmation and mounts on a standard DIN rail or direct panel surface. The basic switch variant is order code 3VA2225-7KP32-0AA0; this AF0 suffix adds the communication module and auxiliary/trip alarm switch set.