Fence Charger Lightning Fuse - 

• Designed for chargers that are rated 5-Joule or larger. 
• Designed to protect your fence charger against lightning strikes to your Hot & Ground fence. 
• Attach fuses inline with charger and Hot fence and also attach inline with ground fence if you run a ground fence with your Hot fence.
• Note: You don’t need to use a fuse between charger and ground stake.