The 242 kA interrupting capacity at 240 V is the headline number; at 415 V it still delivers 187 kA, and at 690 V it drops to 3 kA. That keeps the BOM simple for a feeder breaker, but if you need those functions, you'd step up to a 3VA2 with a different option code.
Panel integration
The 4-pole footprint fits a 70 mm wide cutout in a typical panel layout — check your gland plate clearance for the line and load lugs. The ETU350 is powered internally from the line-side current, so no auxiliary supply needed.
