Breaking capacity is the headline here: 330 kA at 240 V, 242 kA at both 415 V and 440 V, 187 kA at 500 V, and 6.3 kA at 690 V. Those numbers mean it handles high-fault-current scenarios typical of large transformer secondaries or industrial busways — the 330 kA at 240 V is what you'd see on a big 208Y/120 V or 240 V delta service entrance. Temperature derating matters for panel layout: it carries the full 250 A up to 50 °C ambient, then steps down to 238 A at 55 °C, 225 A at 60 °C, 213 A at 65 °C, and 200 A at 70 °C.
What's built into the frame
Communication function is onboard, and the ETU850 allows adjustable protection parameters — LSI (long-time, short-time, instantaneous) plus ground-fault pickup if you add the optional module. Power loss is 50.5 W maximum, so factor that into your enclosure thermal calculation. Rated insulation voltage is 800 V, and the operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C.