Sir Rastus . . . .Festus here . . . .
I'm thinking that is being a 2A Resettable poly switch.
Can you establish a shorted probes condition on your Fluke . . . .Duke . . . . in its low ohms mode and find the series loop resistance, and then measure the dee-vice and come up with its closest resiatance value and then deduct the error resistance.(
COURSE , if you gots the
DEE-LUXE . . . . .wun hunna dollah . . . FLUKE, that is being its initial autocorrect /zeroing feature.)
Then reinstall the dee-vice and fire up ye olde gen unit and take . . . . what should probably be in DC millivolts . . . the voltage reading across it.
Use your found resistance and compute current value with your just established V and R values.
Isn't it falling in as being less than 2 amps . . .or ~1 ?
If so, it is then probably safe to pull the unit again and sub in your FLUKE in DC 10 amps range with the + test lead properly moved and double checking proper switch setting and see what current passage doth lie therein.
If all of thiis tallies out, me thinks that you just done gots yersefs a "durty" [ Texan au Texan ] (cosmetically that is ) but, probably GOOD, polyswitch .
To upstage testing, yet one echelon higher, pull and use a 12VDC source that is hefty enough to drive 3 amps through a 4Ω at ~ 40 watt wirewound resistor in series with the polyswitch for about 15 seconds..
( 60 somewhat years ago I had to replace a clothes drier heating element, that same unit, along with two allimagator clipped test leads, has since, always been my variable POWER LOAD BANK.)
[ Some auto tail light/stop/turn bulbs or park lights have current pull levels that also create good power test loads.]
See if that puppy doesn't go open circuit at ~ 3A, or for sure at a quick 4A and then reset after a proper cool down.
If so . . . . . . direct your sleuthing elsewhere.
ADDENDA:
I see that The Most Honnable Sir Richard the Ist . . . . .has added on here, while I was doing my poking up and researching.
I have never had any need to use this symbol but . . .
voilà
.
73's de Edd
.