On Friday, May 22, 2015 at 12:27:21 PM UTC-4, wrote:
The discussion of the device in series with the Cannon XLR jogged
my memories of the Polyswitch, a protective device whose resistance
jumps up when sufficiently heated (via current), but goes back down
when it has cooled off.

http://www.te.com/usa-en/products/ci...e-devices.html

We ended up not using them, but now I am curious if they show up in
damaged equipment.

The trip current tends to decrease slightly with each fault.
And if left in the tripped (heated) state for extended time,
(like hours.) then again the trip current tends to decrease.
Which is exactly how you'd like a fault detector to fail.

George H.