In the main, small current fuses often are allowed to take a surge at start
up as well, at least the ones in plugs are. As long as they do not overheat
and melt the plastic but blow if the device current suddenly increases in a
major wee then I'm happy, otherwise you would be forever changing them, I'd
imagine.
Brian

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The Sofa of Brian Gaff...

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"Andy Burns" wrote in message
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Cursitor Doom wrote:

I acquired a batch of 2 Amp fuses recently from an unverified source
and decided it might be wise to test them before pressing them into
service. So I hooked one at random up to a power supply and pumped 3A
through it, waiting for it to blow. Now IIRC, it's supposed to blow
before 6 minutes maximum, yet this one kept right on going. I know
there's a general misunderstanding about how fuses work and people
expect them to blow instantly on any amount of over-current, but
that's not how it works in practice. But 6 minutes of 3A?
What does the Panel think?

I think you need closer to 4A to get out of the "forever" zone

https://docs.rs-online.com/9819/0900766b8002b71e.pdf