Yup, UVR is under voltage release and it’s name is pretty self explanatory lol. When voltage is removed, the breaker trips and a Shunt Trip is the opposite, when voltage is applied the breaker trips.
I used Altech UR series breakers because they are a name brand, UL listed, and reasonably priced. Plus they make din rail bus bars that make wiring way easier and neater and it’s also reasonably priced.
Here’s a link to their website:
https://www.altechcorp.com/breakers/UR-Series.html
And the data sheet for the breakers and accessories:
https://www.altechcorp.com/PDFS/URseries(UL1077).pdf
Hawk Electronics and Wolf Automation is where I bought my stuff. Neither one had everything I needed (5 breakers, UVR, and busbar) but between the 2 I was able to source everything.