Reddit reviews 3977394 Dryer Thermal Fuse Kit REPAIR PART FOR WHIRLPOOL, AMANA, MAYTAG, KENMORE AND MORE
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I'm talking about this
It apparently is supposed to provide fail-safe thermal protection in that once it opens, it stays open. I can verify that it is popped with an ohmmeter.
Hadn't thought about the thermostat - it could be stuck closed. I suppose that might make the dryer get hot enough to pop the thermal fuse.