What is this?

[CarpCharacin]

Circuit breaker? Surge protector?

 

[Molpet]

but it is a switch

 

[CarpCharacin]

https://patents.google.com/patent/US4349800?oq=patent:4349800

 

[Molpet]

Circuit breaker? Surge protector?

no

https://patents.google.com/patent/US4349800?oq=patent:4349800

it is not activated by a magnet on the thing it is in or from the outside of the thing it is in.... possible inside the part, but I thought it was some other force

 

[CarpCharacin]

 

[casportpony]

similar function, but not called that

Diode?

 

[CarpCharacin]

Diode?

but it is a switch

 

[Molpet]

Diode?

No

 

[casportpony]

Temperature switch

 

[Molpet]

Temperature switch

ding ding
it is a roll out switch on a furnace
when the flames /heat get too much it shuts down the furnace