My mother owns a device for drying fruits and stuff.
Now every year or so, the thermal fuse breaks. I'm always checking if the fan is damages or something else, but the device is always fine. It is just the thermal fuse which breaks for no known reason.
So instead of replacing it with the same type of thermal fuse every time. I was wondering if I could use a resetting thermal fuse.
The current thermal fuse is labeled DYE ZRJG DF110S which seems to be a DF type thermal fuse made by Limitor with a function temperature of 110 °C. The tolerance is listed as +0/-5 K and the maximum rated current is 16 A.
The device has a rated power of 600 W, so the fuse needs to handle at least 2.6 A. It is a resistive heater, so that should be about it.
As I'm not really familiar with these temperature cutoff switches (is that the right product name?) is there a reason why I should not replace the fuse with a cutoff switch?
I could imagine, that if there finally is a failure in the device and it gets turned on and off by the thermal switch, it might cause more damage.
What I want to achieve is, that the device will run for more than a year without having to replace the thermal fuse (but it should still be protected, so a wire is not a solution).
Sorry - should have done this the right way the first time:
After the request by @jsotola for better pictures I took the device apart again. I also removed the control unit cover to understand how the temperature control is implemented.
What I found was: a micro switch is turning on and off the whole device. A (probably bimetallic) bending strip is the temperature control, the knob controls how much pressure is on the strip and thus controls the tripping temperature of the strip.
Close to the thermal fuse (on the other side of the picture I took first) there seems to be another thermal switch, which should probably act as a first safety measure.