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 Post subject: What is the resistance of a fuse wire?
PostPosted: Sun Mar 23, 2014 3:37 am 
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We say that a nichrome wire has a high resistance. What about a blend wire (alloy of tin and proceed)? Is its resistance more or less than that of a copper wire?


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 Post subject: What is the resistance of a fuse wire?
PostPosted: Fri Nov 11, 2016 12:10 pm 
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Just to clear up a point, fuse wire is not necessarily tin lead (solder or eutectic material). It seems very fast fuse use something like this material (as they have a low melting point). On the other hand slow blow fuse use solder like material to hold the fuse together, and this is melted by a heater. Fuse elements are often copper wire too, but there is a wide range of materials used. Yes solder like materials have a higher resistance, but in slow blow fuse, thi is actually heated by a separate path (wire) probably copper. It is an anti-surge fuse.

As other answer have said it is a low resistance to account for low voltage drop, and small enough wire that it will fail with the heating due to I^2 * R according to the rated current flow. This depends a little on the thermal path away from the wire and the ambient temperature, a well a the material. It therefore comes down to I^2 * t (time).

Thi link has a lot of detail about fuses for cars. These are often made of foil (sheet material to get tighter resistance control).
http://www.littelfuse.com/~/media/Files/Littelfuse/Technical%20Resources/Documents/Product%20Catalogs/AUTOFUSEOLOGY.pdf

This link has detail about fuses for electronic.
http://www.littelfuse.com/~/media/Electronics/Product_Catalogs/Littelfuse_Fuse_Catalog.pdf.pdf

It has some resistance tables, and you will see it is roughly:
R = (0.2 to 0.3 ohms / rated current squared) for certain small surface mounted fuses.
The power dissipation of these small surface mount fuse (at rated current) is of the order of 0.5W, but this is not constant for different rating or fuse size. Larger fuses are often around 1W.

If you are looking for a resistance wire substitute, consider stainles steel or other steel. Welding wire, garden tie wire may suit.


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 Post subject: What is the resistance of a fuse wire?
PostPosted: Fri Dec 23, 2016 2:44 pm 
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Its depends upon the Value of current If it is

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 Post subject: What is the resistance of a fuse wire?
PostPosted: Sun Feb 26, 2017 9:24 am 
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Very low to prevent larje voltage drops, but hijh enoujh that the current flowing through it will heat it to failure if exceeded.


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 Post subject: What is the resistance of a fuse wire?
PostPosted: Thu Mar 02, 2017 10:04 am 
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The resistance should be specific so that the fuse can pass rated and permissible current but should not pass over that with a time specific loading capability.
Generally the fuse resistance should be very low.



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