The Siemens SENTRON 3VA1225-5GF42-0KC0 is a 4-pole molded case circuit breaker rated for 250 A continuous current (Iu) at up to 50 °C, with a TM240 thermal-magnetic overcurrent release. If your panel needs a simple, high-interrupt MCCB with a clean auxiliary contact set, this fits. If you need integrated ground-fault or undervoltage protection, you'll add external modules or look at a different variant.
Thermal derating curve — the real continuous current
Above that, the TM240 release begins to thermally derate: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. If your panel ambient runs at 60 °C, you're limited to 236.5 A continuous — not 250 A.
The 100% N-conductor protection means the neutral pole is fully rated and switched — no derating on the neutral path.