What the 250 A continuous rating means for your panel
The Siemens SENTRON 3VA2225-6HM42-0AA0 is a 4-pole molded case circuit breaker rated 250 A continuous at 40 °C ambient. That 250 A holds steady all the way up to 50 °C — only starts to taper above 55 °C, where it drops to 241 A, then 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. So if your panel runs hot near the top of the enclosure, you still have headroom; you don't need to oversize the frame for a 55 °C environment. Breaking capacity is 242 kA at 240 V AC and 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 4.5 kA at 690 V. That 242 kA at 240 V is high enough for most industrial service-entrance or large-feeder applications where fault current can pile up near the transformer secondary. The 4.5 kA at 690 V tells you this breaker is at home on 400 V class systems, not 690 V drives.
Ground-fault monitoring built in
This version includes summation-current ground-fault monitoring on the L + N conductors. That means it measures the vector sum of phase and neutral currents — catches ground faults without needing a separate core-balance CT or external relay. It's a line-protection design, not a motor-protection or generator breaker, so the trip curve is shaped for cable and busbar protection.
Physical fit and environment
Dimensions are 86 mm deep, 140 mm wide, 181 mm tall. That's a standard SENTRON 3VA frame footprint — fits existing 3VA panel layouts and busbar systems. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Maximum power loss at rated current is 48 W, which matters for enclosure thermal calculations if you're stacking several breakers.