It is remotely possible that something like a Buss HEB holder/KTK fuse could be acceptable for the tap conductor. They have accessory rubber insulating boots and some, a provision for two larger conductors on one end—sort of a feed-through feature.
http://www.bussmann.com/library/bifs/2127.PDF There may be a version that accepts a UL class-CC fuse [200kAIR] making it a true branch-circuit-protective device. The load side of the holder is intended to keep the fuse captive on occasional opening of the holder.
If service is 120/240V, simplification using one fuse and a 120V relay may do. {There are otherwise similar two-pole holders available.}
Littelfuse and Shawmut may have similar… The “breakaway” feature is probably undesirable—it’s to save a roadway light standard from being dragged by a crashed vehicle.
