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fuse before AC switch?
fuse before AC switch?
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Old 26th August 2006, 01:24 PM   #1
jarthel is offline jarthel  Australia
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Join Date: Jan 2002
Location: somewhere in Australia
Default fuse before AC switch?

I've read suggestions from other people saying to put the fuse before the AC switch.

any reason behind it?

thank you.
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Old 26th August 2006, 01:39 PM   #2
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
I would go along with fuse first.

That way anything downstream that goes faulty and draws excessive current is protected by the fuse. The fuse won't save the faulty component and probably not limit consequential damage either, but will stop the mains cable catching fire and worse.

There are some models of IEC inlet and inlet filters that are fused. They always (well nearly always-but I have never seen an example) have the fuse first.
regards Andrew T.
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Old 26th August 2006, 02:22 PM   #3
quasi is offline quasi  Australia
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Location: Adelaide, Australia
I agree with AndrewT. The fuse should be the first termination point for the active mains connection. I always go to the fuse first, loop then solder the connection. I then go from the other side of the fuse to a terminal block and feed components from there.

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