Dual Element Fuse - ECN Electrical Forums

A winner from P38J

Quote

Here's an interesting find while troubleshooting a brake press.

It was one of those "and what is this"? I pulled the fuse and read it .... an FNQ-R3 was supposed to be installed, a TRM-7 was soldered to the blown 3a.
It truly is interesting what some will do. I wonder where the burnt wire is now?
(Sorry, the pic of the fuse installed didn't come out.)

[This message has been edited by electure (edited 02-08-2007).]

Was this someone attempting a 10A fuse? [Linked Image]

No, I dont think they were trying for a 10a fuse. I think they blew the 3a and didn't have one. "But hey, we got a 7a we can solder together and at least make it work". (until the wires burn up)

jezzz now that is very instering idea but very dangerous to do that.

i am sure the heat from soildering can weaken the fuse link inside some way also when they put that goofy fuse back in the disconnection switch they are endangering pretty good there.

i know some 30A fused disconnection switch don't have much room at all and can get flashover if not carefull there

Merci , Marc

P38J,
I thought of that as well, but then these fuses are the same size (physically) IIRC, so why go through the trouble of this instead of just popping the 7A in the fuseholder? [Linked Image]

"so why go through the trouble of this instead of just popping the 7A in the fuseholder? "

If you look closely, the 3 A. fuse is a rejection type, so its likely its not going to fit plus the FNQ fuse is more costly so never underestimate a cheapskate.

I'm surprised that they didn't have a 3 amp gum wrapper!

I'd be amazed if that conglomeration actually stayed together with carrying current.
Soft-soldering has a eutectic temperature of 332C, above that, this arrangement would fall to pieces.
It only has to get hot on one side mind you.
A very poor implementation of basic fusing rules.
What sort of a clown would even attempt this, let alone think that it complies with the laws of electricity.
Kirchoff's law would tell you that there is no way that this could work.
Anyone beg to differ?.

Perfect example of a little knowledge (not to mention creativity) being dangerous.

I bet the 3A one is blown, and this was a "quick fix" way of getting things running. I'm sure they planned to put the correct fuse in right away and it stayed in there until now.

It came out of a running press. There were actually 2 of these on the control circut transformer. I had a pic of them installed, but it didn't come out well enough to see them.
Jerry