Digikey has a number of small breakers rated for "32VDC, 125/250VAC". I'm confused as to how this works -- if I=V/R, wouldn't using a different voltage change the behavior of the fuse or breaker?

Allied Construction Products has three all-new Sandvik Small Range breakers—BR555, BR777 and BR999—all of which are designed without tie rods and incorporate the manufacturer’s Constant Blow ...