In recent threads, there have been a number of comments about high voltage
Carl mentioned sand-filled fuses, something I hadn't heard of.
I checked the Mouser catalog for HV fuses, and was stricken with
sticker-shock...$38 for a fuse?
OK, we re-think this one...
I know that an old but workable approach is to use a thin piece of wire
as a fuse...mount it between a couple of standoff insulators, and it should
function fine, and if current is substantially too high, the fuse wire
blows. How do you figure the appropriate size wire to use? And then, how do
go about ordering 6" of #30 wire, or whatever it is? If you need more
current capacity, to use the above example, can I put two strands of #30 wire
in parallel, and expect them to function as a reliable fuse? I'm always
worried about kinking the wire, or if it's enameled, sanding off more than
just the insulation.
The plan is to fuse the HV output of a 5KV 2A supply to a 3X3, which of
course will only be used at the legal limit or into a dummy load.
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