On 14/01/2020 14:34, Dave Plowman (News) wrote:
In article ,
whisky-dave wrote:
I thought your reasoning was that if you overloaded the fuse it might
keep working but get very hot and damage the plug (though I thought
they were packed with sand to prevent that happening). .

Sand doesn't stop things getting hot, think of a desert and even beaches
in this country. Sand also has the effect of lenghing the possible
life-time of a fuse running close or even exceeding it's rated value.
The sand will conduct the heat away from the fuse wire so it doesn't
melt quite so easily.

Just wondered if the sand would help prevent the fuse exploding in event
of a sudden severe overload?

Its primary purpose is to quench the arc in the event of a fault. So yes
they can and will reduce the explosion risk - especially on low
impedance supplies.


--
Cheers,

John.

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