Comment on Joe’s combination-starter insides picture: the “dummy” fuses look “field fabricated” from copper tubing. There’s one problem—tubing is mis-sized, for the ferrule diameter of 240V Class-RK5 is 9/16-inch, and 600V Class-J is 13/16-inch. Copper tubing OD is ½, 5/8, ¾ or 7/8. whick will distort, or require distorting, ‘NEC’ fuse clips to work. Believe it or not, Busmman (and maybe others) make true brass dummy fuses. They may not be listed, but they fill a specifc need, and are obviously marked for their intended purpose.
It’s come up at E-C.net before, but I can’t find it in a search.
See page 2 at
http://www.prime-electronics.com.au...Accessories%20&%20Display%20Kits.pdf They’re kinda’ hidden for being online, but this link looks like page 184 of their catalog. Bussmann Class-R(!) “Dummy Fuses” [N.B.: catalog numbers NTN-R (30-400 amp) and NTS-R (30-600 amp) ] The point is, there is a product made to exactly fit the need—agreed under special circumstances where there is clearly properly-rated overcurrent protection upstream.
They will safely convert a fusible device to non-fused, the same as a non-fused combination starter, or (in some cases) where a fuse trailer block cannot be removed to reconnect the magnetic-starter "L" leads directly to the lower terminals of the disconnect switch—in place of the top fuse clips.
