The good thing about using a contactor is that you can use a regular key (and/or handlebar cut off switch) to open the contactor and turn things 'off'. Many contactors have 12 volt coils, but I believe the one in your picture has a 36v coil. 12v is a bit easier to work with as the regular electric system on your motorcycle is 12v. Unless you have a 36v system, controlling HV power with this particular contactor may be problematic.
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