The Siemens SENTRON 3VA1225-4EF42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 250 A continuously at 40 °C with no derating needed up to 50 °C — it holds 250 A flat across that range, then tapers to 223 A at 70 °C.
Breaking capacity by voltage — what it means for panel coordination
At 415 V the breaker interrupts 75.6 kA, at 440 V it's 52.5 kA, at 500 V it drops to 17 kA, and at 690 V it's 11.9 kA. That's a steep curve above 440 V — if your service transformer secondary is 480 V with a 65 kA available fault current, this breaker's 17 kA at 500 V won't clear it. You'd need an upstream current-limiting fuse or a higher-rated frame.