A Thermo Fuse can be tested with a multi meter, check to see if it has contenuity between the 2 pins. if it does it usualy is good.
If it does not, then it is blown and you might have another problem with your dryer as well as the blown thermo fuse. Your themo fuse will blow when it reaches it's maximum tempreture. The Thermo fuse's job is to keep your dryer from overheating and let the service person know there could be a overheating problem.
Make sure your venting is clear and put your new Thermo fuse in and give it a shot. if your new thermo fuse should blow out, you should have a service Tech look at your machine.
You cant tell by looking at them.you will need an ohms meter to check them for continuity. Place the red lead to one of the spades and the black lead to the other spade. If you get any movement at all on the dial or gauge, the fuse is good.
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