The Siemens SENTRON 3VA2225-7HN32-0BC0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C ambient, with a maximum breaking capacity of 330 kA at 240 V. That 330 kA figure drops to 242 kA at 415 V and 440 V, then to 187 kA at 500 V, and to 4.5 kA at 690 V — so the voltage class of your distribution panel directly governs which interrupting rating applies. The part carries an undervoltage release (UVR) and two built-in auxiliary switches (HQ design), meaning it can signal its status to a PLC or safety relay without an external accessory block.
Thermal derating and panel integration
The 250 A continuous rating holds from 40 °C up to 50 °C. Above that, it derates linearly: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. If your panel ambient runs at 60 °C, you lose 18 A of headroom — factor that into the load schedule. The breaker occupies 105 mm width on the DIN rail, with a depth of 86 mm and height of 181 mm. That 105 mm footprint is standard for a 3-pole frame in this class; verify the adjacent device spacing if you're retrofitting into a tightly packed enclosure.
Design and compliance
This MCCB is designed for line protection (not feeder or motor protection), with a maximum power loss of 50.5 W at rated load. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The basic switch variant is order code 3VA2225-7HN32-0AA0 — the -0BC0 suffix adds the undervoltage release and auxiliary switches. No ground-fault monitoring or communication function is included on this variant.