Capacitor voltage rating range?

[mitch]

I have a capasitor that's rating is 189...227uF and Un 250V~/Up 275V~ I found one that is 189...227 and 220-250 volt.

My question is will the 220-250 volt capacitor work with the 250-275 volt? They both are rated for 250 volts, right? Is that rating a range between the two numbers?


New?
https://www.amazon.com/gp/product/B00C0VZA0W/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

[trobbins]

Un is the rated continous rms max voltage.  Up is a short duration, limited no of events, peak rms level that doesn't cause degradation. Similar to electrolytic ratings that comply with xxxx standard.

[mitch]

Un is the rated continous rms max voltage.  Up is a short duration, limited no of events, peak rms level that doesn't cause degradation. Similar to electrolytic ratings that comply with xxxx standard.

So Un220 & Up250 for the one on Amazon, so it could work?
I'm completely new to electronics.

[bob91343]

The closer you run a capacitor to its voltage rating, the lower its reliability.  So using the lower voltage unit won't cause immediate problems but the long run is grim.

It's usually wise to provide a voltage rating higher than necessary in order to stave off the degradation that occurs with more voltage stress.  Once the capacitor develops a slight leak in current, that warms it and raises the temperature.  And temperature is the primary cause of failure.