PowerFuse
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Once when I was walking my dog, I found this giant (12 inch long) fuse laying in a stream near Felton, CA. It must have fallen out when PG&E workers were repairing a transformer.
The fuse is liquid filled. Here's some of the text on it: TeddyBear]
23kV bussman liquid power fuse
I called Bussman and asked if the liquid inside was toxic, they said no.