What this 4-pole 250 A MCCB carries
The Siemens SENTRON 3VA2225-8HM42-0AA0 is a 4-pole molded case circuit breaker rated 250 A continuous at 40 °C through 50 °C, with a 440 kA interrupting capacity at 240 V — that is the headline number for fault-clearing on a high-capacity distribution bus, not a motor-starting duty.
At 415 V and 440 V it still holds 330 kA; at 500 V it drops to 220 kA; at 690 V it is 52.5 kA. The 250 A frame with those interrupting ratings is not a branch device; it is a main or tie breaker.
Thermal derating and physical fit
The 250 A rating holds flat to 50 °C; above that it derates to 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. Dimensions are 140 mm wide by 181 mm tall by 86 mm deep — a standard 4-pole MCCB footprint for SENTRON 3VA frames.