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#123506 - 04/04/06 07:05 AM Overheated Fuse  
pauluk  Offline
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Thanks to Johno12345 for the following:

This fuse and holder was removed from one of our oil quench cooling systems which had stopped working. There seem to be 3 things wrong that may have caused the heating. The terminal screw was loose, the fuse screws were both loose and there seems to be some spring contacts misssing from the burnt side. The fact that the load cycles probably accelerated the demise of this. The fuse is still in tact. Incidentally, does anyone know the relevance of the "RED SPOT" on the fuse?

[Linked Image]
[Linked Image]

[This message has been edited by pauluk (edited 04-04-2006).]

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#123507 - 04/04/06 08:32 AM Re: Overheated Fuse  
Larry Fine  Offline
Joined: Feb 2005
Posts: 693
Richmond, VA
If I'm not mistaken, the red spot blackens when the fuse blows.

Larry Fine
Fine Electric Co.

#123508 - 04/04/06 09:58 AM Re: Overheated Fuse  
Lostazhell  Offline
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Littlefuse makes fuses (called "The Indicator") with a small window so you can see part of the element inside. If the window is blackened, it usually means a dead short occured vs. an overload.

#123509 - 04/04/06 10:18 AM Re: Overheated Fuse  
Alan Belson  Offline
Joined: Mar 2005
Posts: 1,803
Mayenne N. France
Is that a tensile-test piece on the desk? Takes me back a few decades!


Wood work but can't!

#123510 - 04/04/06 07:33 PM Re: Overheated Fuse  
PCBelarge  Offline
Joined: Jun 2003
Posts: 681
Dobbs Ferry, NY, USA
That looks like a lot of strands for such a small conductor size???
If it is not the standard number of strands for the conductor size, it may not be a Class B stranding type, which most likely would not be permitted in this type of installation.

Pierre Belarge

#123511 - 04/04/06 08:38 PM Re: Overheated Fuse  
classicsat  Offline
Joined: Nov 2002
Posts: 456
Curious, what is that PC-board memory module like thingy on the desk, beside the little screw?

#123512 - 04/04/06 11:39 PM Re: Overheated Fuse  
Larry Fine  Offline
Joined: Feb 2005
Posts: 693
Richmond, VA
PCM-CIA board?

Larry Fine
Fine Electric Co.

#123513 - 04/05/06 05:46 AM Re: Overheated Fuse  
winnie  Offline
Joined: Sep 2003
Posts: 649
boston, ma
That does look like the sort of stranding one sees on welding cable or the conductors in SO cord. What are the issues with using this sort of stranding?


#123514 - 04/05/06 06:27 AM Re: Overheated Fuse  
electure  Offline

Joined: Dec 2000
Posts: 4,262
Fullerton, CA USA
Are those ribbons wrapped around your shoes?

#123515 - 04/05/06 06:40 AM Re: Overheated Fuse  
Trumpy  Offline

Joined: Jul 2002
Posts: 8,223
SI,New Zealand
Red Spot is a brand-name.
That wire looks not unlike welding cable, with that many strands in it.

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