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Using a switch or disconnect with a higher current rating than is needed will not cause any issues. Using fuses with a higher current rating than what they should be, may cause serious issues. And remember this, disconnect switches, like a battery isolation switch will have ratings for both voltage and current. If it is rated at let's say 50 amps at 12VDC, and you are using it at a higher voltage, the current rating will be less. Direct current (DC) will always have a tendency to "arc" when it is open if there is a load on it, so remember, when opening one, try to have the least amount of load on it as possible with the situation you are in...AND, operate the switch very quickly...in other words, don't lolly gag around when you are opening it, make it snap open. Just some random thoughts on the topic and things that you may already know, but it never hurts to remind...or enlighten!