When it is really necessary to place the control inside, a metal box is made which shields its walls at the temperature so that it does not affect the electrical circuitry.
... are two boxes one smaller than the other and between one box and the other carries fiber than is used in ovens, looking for these boxes already made would not, it would be easier to send them to do with a blacksmith who has a small bender ...
... resettable thermal fuses, it sounds to me to put my hand to work again after having opened, which I do not think, bimetallic switches seem to me the option, they have graduation for the adjustment of cut ...
I also offer more confidence bimetallic switches (thermostats), and as I need to open several circuits, I will use a relay. To see if it can stand the temperature, I will have to do tests. Take it out of the box, etc. Thank you for your contributions, ideas, and interest.