Product review (3 stars): Replaces factory fuse, but relatively poor design
Part of the unhappiness with this product is actually with the oven it is in. This $5 part sells for over $40 here, $90 through official channels and is subject to blowing when you use the self cleaning function on your oven. Unlike a true thermistor, this does not "reset." It is more of a heat activated fuse, and once it blows must be replaced. That means frequent replacements.

If you open your oven door there are four wide slots. This is air intake for the cooling fan in back. Near one or more of these slots will be black tracks where you can see air is being dragged past the oven seal and into the cooling. A defective gasket is causing this part to blow. On my oven it is Whirlpool part number 8304493. Remove the old gasket, clean the surface well, and put in a new gasket. You may also want to blow a fan over this area while using the self cleaning function to help ensure cool air is available to the unit fan and this fuse does not blow.

My oven is a single KitchenAid branded oven. It removes quickly from the wall, and there are 7 or so sheet metal screws that hold the very top plate on. This switch is located on the top, left corner and is reasonably easy to reach and change. Use two people to safely remove the oven, and have a small strong table ready just in front of the oven to pull out onto. These ovens are hard wired in and you won't go far with it. This is my third replacement in 7 years, and I can now do the entire job in about 20 minutes.