I cant find anything on what this is. can someone enlighten me?

 

Over temperature cut out switch.

 

Some call it a limit switch.

 

Over temperature cut out switch.

awesome thanks. put my lighter up to it while running continuity and it opened the circuit. goona use them on my MOT arc welder tranformers

 

Some call it a limit switch.

I know them as Over-temp or thermal switches, a Limit switch to me means a Machine Over-travel switch.
Max.

 

That's why I like for people to show where there are at. We always called them limit switches in this region.
I have two in the firebox on the gas furnace and two in the electric dryer.