Originally Posted By: Jim Fogle

One problem that can result from using a switch that has high current contacts in a circuit with small current is the switch contact surface can oxidize and create a high impedance barrier. Small current will not be able to generate enough flow to punch through the barrier.



That doesn't make much sense to me, Jim. Those ratings are maximum ratings, doesn't mean you need to run that much current for the switch to perform properly. A switch rated for higher current will have a larger contact area and if anything will be more reliable over time.