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I'm not sure why you think it cannot be used as a fuse. Granted, it's not the best idea, it is possible.

.002" Tungsten wire will glow and burn when it undergoes a current of approximately 9A. At 10A, this gauge tungsten wire will emit a bright white light, and fuse. There are, however many reasons why you shouldn't use it as a fuse.

One reason it shouldn't be used as a fuse that is burns extremely bright (damaging to retina), and when exposed to oxygen, it creates toxic fumes. Tungsten also has a high melting point, so when it fuses, and sparks that are emitted pose a fire hazard.

Incandescent light bulbs use usually use tungsten wire, but are filled with a noncombustible gas (e.g., argon) which keeps the tungsten from oxidizing and 'burning up'.

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Q: Why can't tungsten wire be used as fuse?
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What is tungsten wire what is it made up of?

tungsten is a wire used in making filaments of the bulb.


Why tungsten wire is not used in an electric heater?

Too expensive. Ni-chrome wire is cheaper.


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A heater does not get hot enough to benefit from the expense of using tungsten wire. Most heaters use either wire made of an alloy called nichrome or plated ceramic heating elements. Heaters generally operate at red or orange heat (i.e. 1409F to 1908F) and can use nichrome wire. Lightbulbs operate at white heat (i.e. greater than 2309F) and use tungsten wire, but tungsten is hard and expensive to make into wire compared to softer metals.


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Metal with a lower melting point is preferred for fuse wire to reduce the risk of fire.


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