Here's a reply I received from Bussmann:
Hi Joe,
It appears one of the members properly identified the product which we offer.
We offer "dummy" fuses or neutrals for Class H/R, Class CC, midgets (13/32" X 1-1/2") and small dimension (1/4" X 1-1/4") fuses.
These fuses can only be utilized where overcurrent protection is not required by the code, such as for neutrals.
For example, let's say you have a 120/240V system and use a 3 pole 240V switch.
You could run the two hot phases through two of the poles with protection by a fuse and install the "dummy" fuse in one pole, and run the neutral through.
They also use these allot in lighting circuits for the neutral conductor.
Bussmann
