Fuse from Cisco 24-port switch 10/100
- Thread starter solar_plasma
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Findm-Keepm
Well-known member
Looks like a 315 or 318 series Littelfuse fuse. They don't use indium in their consumer grade stuff. MIL and medical series stuff is listed with alloyed metals (proprietary), and they just made some of their mil stuff obsolete. Either way, not likely to find indium in a consumer-grade fuse, as the cost of one fuse (wholesale) is around 35 cents. Some BEL or Bussmann stuff might have indium, but your fuse looks more like a Littelfuse to me.
Cheers,
Brian
Cheers,
Brian
solar_plasma
Well-known member
Thank you, Brian.
solar_plasma
Well-known member
It's an extremely soft metal with a density of about 7 g/cm³ (on a 0,1g weight: 0,7g/0,1 cm³).So I would exclude Pb, which actiually has been used in old fuses. Also Cd and Bi and more dense. But it seems softer than pure tin or lead, which are softer than Cd and Bi.
Next step will be to measure the weight more precisely on a o,o1g/weight. Think I will try to find a chemical test by time.
Next step will be to measure the weight more precisely on a o,o1g/weight. Think I will try to find a chemical test by time.
Zinc alloy will be most likely.... like in this... http://zeeman-fuses.en.made-in-china.com/product/MeCxwsFEralP/China-Glass-Tube-Fuses.html
Or aluminium....like in this case...... http://www.openelectrical.org/wiki/index.php?title=Electrical_Fuse
Or aluminium....like in this case...... http://www.openelectrical.org/wiki/index.php?title=Electrical_Fuse
bismuth would most likely have too low a melting point for most fuses, although in fusible links (where the solder melts in the link from heat or fire this would be a metal used (fusible links are mechanical links a safety device not an electrical fuse).
fuses will normally be made of cheaper metals, although sometimes metals like silver will be used because it does not oxidizer easily.
I think platinum in a fuse would be extremely rare.
some metals used in fuses and their melting points, (fuse amperage can be a product of resistance and size of the fuse wire diameter, in essence the wattage or heat at which the element melted).
Lead 327 deg. C
Tin 232 deg. C
Iron 1535 deg.C
Silver 960 deg. C
Platinum 1774 deg. C
German silver 1450 deg. C
Aluminum 660 deg. C
Copper 1083 deg. C
fuses will normally be made of cheaper metals, although sometimes metals like silver will be used because it does not oxidizer easily.
I think platinum in a fuse would be extremely rare.
some metals used in fuses and their melting points, (fuse amperage can be a product of resistance and size of the fuse wire diameter, in essence the wattage or heat at which the element melted).
Lead 327 deg. C
Tin 232 deg. C
Iron 1535 deg.C
Silver 960 deg. C
Platinum 1774 deg. C
German silver 1450 deg. C
Aluminum 660 deg. C
Copper 1083 deg. C
solar_plasma
Well-known member
Thak you guys. I just wondered, because I've never seen such a thick and soft wire in a fuse before. It looks like a 2-3 mm thick, round solder wire. According to your informations and according to its density and an estimated Mohs hardness around 1,5, tin will be a good candidate.
