Product review (5 stars): These thermal fuses work GREAT!!!
These have proven to be just as good as the OEM's that are out there. We've installed hundreds of these over the years and not one defective thermal fuse. Also, I like the fact they're made by SUPCO...Right HERE in the USA!!! (actually HERE in NJ!) ;-)

NOTE: 99% of the time (or very close to that!) these are damaged simply because the heat temperature exiting the dryer exceeded 191 degrees.
To prevent this from happening again, always replace the *thermostat* that's located within a couple inches away (possibly more) from the thermal fuse. These thermostats maintain the correct temp inside the dryer. They are approx. rated for 135 degrees to 155 degrees (I'm talking about the AVERAGE temperature). Once in a while it might be by a safety or high limit thermostat. Pretty rare for this particular thermal fuse. In some cases, the newer dryers don't have a thermostat to maintain the correct temperature. Those dryers have 'thermistors'. That's a whole other topic.
Next:
You need to check the vent connected to the dryer and make sure there's GOOD AIR FLOW coming out of the outer vent /vent cover. There are many types of external vents or (some folks call them 'vent covers') If you don't know where your dryer vent goes to outside your home, I highly recommend you find someone who CAN locate it and check it for you. A clogged or partially clogged vent can cause your dryer to take a long time to dry clothes and that also makes your dryer work much harder to get the job done.
Between the thermostat allowing it to over heat OR the vent causing the trouble, you won't have ANY heat when these thermal fuses go bad.

Please know this: if the thermal fuse isn't bad and the dryer isn't heating, there may be something wrong with the electronic ignition, electric heater, safety thermostats, wiring...etc.

I hope this helped!