Circuit Breaker

Most cars have a max speed. But they not always drive as fast.

I 'd look what a breaker does.

It doesn't matter to use bigger voltage rating of CB to the smaller voltage level.

Normally the most important factor to select CB is related current (overload, Ics, Icu and so on.) because the main purpose of CB is to protect loads from abnormal current.

Thanks.

Main purpose of CB's are to protect the conductors!

Then I have to ask:-

"Do lightning Conductors get Thunderous Applause?"

Yes it will work.

Real question is, why you are asking?

It'll work fine as long as you're sure it's switching AC (and it's corretly rated for the current). Do not use it for DC circuits unless you can study (and understand) the spec. sheet, and you know exactly what the load is.

Voltage ratings are to inform you that they are designed for the stated voltage.

This has to do with the internal components and insulation levels.

You should look at the current handling capacity. This should be derated for operation in higher ambient conditions. Also it makes sense to use a circuit breaker about 20 % higher than the expected maximum current.