Looks like an insulator to me. You can see another one on the other end of the wire fence in the reverse angle. There is a bit of insulated wire but it’s hard to tell if it is a jumper or runs to a controller out of frame. Either way a switch for a system like this would be in a dry and presumably locked location (in a box or building) as the farmer wouldn’t want just anyone to come and diddle with the switch.
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