Breaking capacity hits 330 kA at 240 VAC, drops to 242 kA at 415/440 V, 187 kA at 500 V, and 4.5 kA at 690 V — the 690 V figure tells you this isn't the breaker for a 690 V main; it's a 480 V class device with headroom. Adjustable thermal-magnetic trip covers 375 A minimum to 2500 A maximum, so it's not a fixed 250 A — you set the overload and short-circuit thresholds to match the downstream cable and load.
Thermal derating matters here
Above 50 °C it derates: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, 213 A at 70 °C.
What's on board and what's not
The basic switch supplied is order code 3VA2225-7HL32-0AA0.