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?
[This message has been edited by pauluk (edited 04-04-2006).]
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.
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.
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?
![[Linked Image]](https://www.electrical-contractor.net/PC/HPIM1296.JPG)
![[Linked Image]](https://www.electrical-contractor.net/PC/HPIM1294.JPG)
