The 187 kA breaking capacity at 240 V — and 121 kA at 415/440 V — means this breaker can interrupt high-fault-current events without cascading upstream, which simplifies coordination studies on large switchboards.
Ratings that decide fit — the so-what for your BOM line
Continuous current holds at 250 A from 40 °C through 50 °C ambient, then derates to 241 A at 55 °C and 213 A at 70 °C. If your panel ambient sits at 55 °C, you lose 9 A — still comfortable for a 250 A bus, but worth checking if you're pushing the breaker to its nameplate. Breaking capacity steps down with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 4.5 kA at 690 V. The shunt trip (STL) release lets you drop the breaker from a remote E-stop or PLC output, which saves running a separate contactor for emergency disconnect on a feeder.
The 3VA2225-5HL32-0JC0 measures 181 mm high, 105 mm wide, and 86 mm deep — standard MCCB footprint for a 250 A frame. The shunt trip and auxiliary switches are pre-installed, so no extra wiring behind the breaker for those functions.