The Siemens SENTRON 3VA2225-7HN32-0JH0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, designed for line protection in distribution panels. Its interrupting capacity hits 330 kA at 240 V, dropping to 242 kA at 415 V and 187 kA at 500 V — numbers that matter when coordinating with upstream gear in high-fault industrial feeds.
Ratings and what they mean for fit
The 250 A rating holds steady from 40 °C up to 50 °C, then derates to 241 A at 55 °C and 213 A at 70 °C — so in a warm enclosure without forced cooling, you lose about 15% of headroom. That 330 kA at 240 V is the maximum short-circuit current the breaker can safely interrupt; at 690 V it drops to 4.5 kA, reflecting the arc-quenching limits at higher voltage. The breaker ships with a shunt trip (STL) and two auxiliary switches plus a trip alarm switch (HQ), giving remote status and trip-signal capability without adding external relays.
Physical integration
Footprint is 105 mm wide, 181 mm tall, 86 mm deep — fits standard panel-mount cutouts for a 3-pole MCCB in this class. No DIN-rail mounting; it bolts directly to the backplate or mounting pan.