Breaking capacity hits 440 kA at 240 V, 330 kA at 415/440 V, 242 kA at 500 V, and 50.4 kA at 690 V — that's serious fault-clearing for a 250 A frame.
Thermal derating and real-world fit
Above that it steps down: 241 A at 55 °C, 232 A at 60 °C, 222 A at 65 °C, and 213 A at 70 °C. The max power loss is 48 W, which matters for enclosure heat calculations.
What's inside the can
The base switching mechanism is the 3VA2225-8HL32-0AA0. The integrated auxiliary trip module is a 3VA9688-0BL30. The shunt trip (STL) is wired for remote tripping — useful in emergency-stop circuits or automated disconnects. The ETU320 is a basic electronic trip unit; it handles LSI protection (long-time, short-time, instantaneous) but not ground-fault or power metering.
The auxiliary switches (2 HQ) are built in, so you don't need to add a side-mount accessory for status feedback.