Hello Achim,
nice pictures, how to access the thermal fuse, thankys for sharing.
Sorry to say, but a poly-/multifuse is the totally wrong component for
this purpose.
It will neither help on overcurrent, nor on overheating.
The trip current (where MF opens) will be ca. 3A @ 23°C, and ca. 1.5A @
85°C, where the oven is running normally.
I've taken these data from BOURNS MF-R type, should apply also to your
special component.
Datasheets end at 85°C, so I estimate that thermal derating of the MF
would perhaps give about 750mA @ 145°C which also does not shut down
further heating, but will for sure damage permamently all internal
soldering junctions.
Therefore, a regular thermal fuse (max. 105°C type) will ease your mind
better, than this shunt.
Frank
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