The interrupting capacity hits 187 kA at 240 V AC and still holds 121 kA at 415/440 V, which puts it in the high-fault tier for industrial switchboards where available fault current runs heavy.
That's unusual for an MCCB; most thermal-magnetic units start dropping at 50 °C. The ETU320 electronic trip gives adjustable long-time, short-time, and instantaneous pickup, plus ground-fault capability if you add the module (this unit ships without ground-fault monitoring). Footprint is 105 mm wide, 181 mm tall, 86 mm deep — standard 3-pole MCCB spacing for a 200 A frame. Power loss maxes at 5.4 W, so heat buildup in a densely packed panel is manageable. The 3VA series uses the same mounting pattern across the frame sizes, so swapping a 63 A unit into a slot that held a 100 A 3VA is a straight mechanical fit as long as the bus bars and lug kits match.
Interrupting capacity — the real number to watch
The interrupting capacity drops off sharply above 500 V: 75.6 kA at 500 V, then only 3 kA at 690 V. The high 187 kA at 240 V makes it a strong candidate for the main breaker in a 208Y/120 V panel feeding a high-fault transformer.