What the interrupting ratings mean for your fault-current study
The Siemens 3VA2225-5HN32-0AB0 is a SENTRON molded case circuit breaker (MCCB) rated 250 A continuous at 40 °C, with a 3-pole line-protection design. Its interrupting capacity is 187 kA at 240 V AC, 121 kA at 415 V AC, 121 kA at 440 V AC, 75.6 kA at 500 V AC, and 4.5 kA at 690 V AC. That spread covers most industrial distribution voltages — the 187 kA at 240 V handles high-fault panels fed by large transformers, while the 4.5 kA at 690 V is a reminder that the same breaker is still usable on 690 V systems but only where the available fault current stays under that threshold.
Thermal derating — the current you actually get above 55 °C
The breaker holds its full 250 A rating up to 50 °C ambient. 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 runs hot — say a non-ventilated enclosure near a furnace line — size the load to the derated figure, not the nameplate. The maximum operating temperature is 70 °C; storage range is -40 °C to 80 °C.
Physical fit and auxiliary configuration
Dimensions are 181 mm high × 105 mm wide × 86 mm deep. That 105 mm width is standard for a 3-pole MCCB in this frame size — it fits most DIN-rail or panel-mount footprints without surprises. The breaker ships with two built-in auxiliary switches (HP type) and no undervoltage release, no ground-fault monitoring, and no communication module. The base switch variant is 3VA2225-5HN32-0AA0; this order code adds the auxiliary switches.