Micro Switch Amp Rating

No that is tricky. DC is actually harder on switches than AC in some ways, and if it is switching an inductive load it gets worse. That is why, EG you see spike/. supressor/ flyback diodes across relay coils. "Somewhere" there should be a DC spec for that buried in the microswitch specs. Otherwise, what I'd do is wander over to one of the electronics websites like Mouser and see if you can find a similar one that lists both the AC/ 125V specs and the DC specs

IT MAY ALSO BE that switch is designed for AC only and simply will not survive well if used for anything very heavy on DC

This all has to do with AC current. When a switch breaks under much of a load, it arcs. With AC as the switch breaks, the AC goes through "zero crossover" at some point and limits the current and power of the ARC. DC is more like a welder. The thing will arc until the gap is wide enough to finally kill the arc, and the higher the current, the worse this can be.