What this MCCB carries, and what that means on the panel
The Siemens 3VA2225-5HN42-0AJ0 is a SENTRON molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a 4-pole configuration and line protection design. Its interrupting capacity hits 187 kA at 240 V, tapering to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 4.5 kA at 690 V — so the high-fault performance lives at the lower voltages common in North American 240/480 V distribution, while the 690 V figure still clears a respectable fault for European 690 V industrial grids. The 250 A rating holds steady up to 50 °C, then derates to 241 A at 55 °C and 213 A at 70 °C, which means you don't lose headroom until the panel ambient climbs above 50 °C — useful in a hot MCC room or near process heat.
Panel fit and thermal budget
The breaker measures 181 mm tall, 140 mm wide, and 86 mm deep — a standard MCCB footprint for a 250 A frame. Max power loss is 48 W, so factor that into your enclosure ventilation calculation if you're stacking several breakers in a sealed cabinet. Operating temperature spans -25 °C to 70 °C, storage from -40 °C to 80 °C, which covers most indoor industrial environments and unheated warehouses.