Sounds like you need to install a relay between the switch and the circuit breaker for the dash air if there isn't one already. That would eliminate some voltage loss through the wiring and switch and protect the switch. The bigger question is why are the AC clutches burning out. This is typically from either a relay (if one is present) hanging and keeping the compressor on all the time or more likely the compressor clutch not having the proper air gap. Many compressor clutches have to be adjusted with shims.
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