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Disappearing fuse wire
Where cause is unknown I closely inspect fuses to gauge whether
mechanical/aging or thermal failure and then an idea of rupture current. This ELU 20mm 500mA F fuse had no trace of the wire , no smoke stain or hazing at all in the glass tube. I cracked the glass expecting to see remnants of wires or powder or something in the ends but nothing, all "evaporated". Looks like the construction is "festoon bulb" ie totally glass , sealed envelope with metal end caps added, something to do with it? , I've not ground-off or heated off the end caps yet. |
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