Redbull,
we really do need more info to help you, was this the Kubota that stopped?
stopping a tractor with an electrical fence is not "normal" so something electrical is likely.
If your engine is diesel, most will keep running even with impaired electrics, unless you have a newer model that
is electronically controlled. Then you may have zapped a black box, as texasjohn says.
this is very unusual. When fixed please let us know what it was. Good luck.