Thanks for the update "I want to switch the polarity back and forth on a 36 volt, 800 watt DC motor."
Based on that I will add: IFFFFFFFFFFFF its a permanent magnet (NOT a wound electromagnetic created field) DC motor and you reverse polarity it (depends on motor design and windings etc etc) can reverse the direction.
YES a proper wired DPDT switch which has sufficient DC Voltage and Current and HP rating can be used to as you state "reverse polarity"
Hope this helps
PS Again, any electrical or legal question always draws out more responses and opinions then any other topic
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