The SENTRON 3VA1225-5EF42-0HC0 is a 4-pole molded case circuit breaker rated 250 A continuous at 40 °C, with an interrupting capacity of 187 kA at 240 V — that's the headline number for fault clearing in low-voltage distribution. At 415 V it still holds 121 kA, and at 690 V it's 17 kA, so the same frame covers both 400 V and 480 V systems without swapping breakers for the voltage class. Rated insulation voltage is 800 V, and the thermal derating curve is flat from 40 °C through 50 °C (still 250 A), then drops to 243 A at 55 °C and 223 A at 70 °C. This is a line-protection design (not motor-protection), so it's sized for feeder or main breaker duty in a distribution panel, not for direct motor overload protection.
It fits the same mounting hole pattern as other SENTRON 3VA frames.
That 187 kA figure is the short-circuit current rating (SCCR) at that voltage; the breaker itself is the protection device, not a downstream component needing a current-limiting fuse upstream. In a sealed panel with multiple breakers, that's about the heat of a small incandescent lamp per unit — account for it in the ventilation or cooling calculation.