I think I've seen 60VAC reappearing as some "de facto" rated voltage standard for these U.FL connectors no matter brand. These are based on the Hirose U.FL series, which inconveniently doesn't seem to specify a voltage rating either (other than 200VAC breakdown). If you want to be sure for your particular connector, I guess you'll have to ask Wurth. It is a RF connector though, so you probably won't find anyone specifying any DC voltages - because it is simply not intended to be used for DC.

Hi Lundin, thanks for the thought. I think some connectors do specify VRMS, for example MMCX series from TE. Also RF connectors, 170VRMS @sea level.

Elleanor Lopez‭ I've only seen it in terms of no insulation break down voltage. Though this is admittedly far from my area of expertise - I just happen to use these connectors a lot :) I think you'll need a connector expert, so poking Wurth support is probably the way to go.