An update on these fuses. I am assuming the original failure I had was due to overheating while soldering. I have now soldered about 8 in place without a failure. As you apply the solder you can actually hear the fuse "click" (It is faint, but audible if things are quiet) and I use that as an indication I cannot linger with the iron much longer and back off as quickly as possible. Still, I have kept applying the iron a few more seconds after the click without any more failures. After you are done soldering, the fuse will be "Open" due to the heat, but after 10 seconds or so (A little water bath helps too!) it will "Click" again and works just fine.
Also, I installed two on a dual battery sled and tested for reverse polarity protection. Inserted one battery upside down and then connected the negative tabs of the sled - almost immediately "Click" and resistance
through the fuse jumped very high - remove the connection from the negative tabs and another "Click". Even had instances when both fuses would open. Also left the
batteries in this state for a longer period (60+ seconds) and they returned to normal operation.
That's my experience with them anyway!
