Reddit reviews 5 Pcs Aupo Thermal Fuse TF Cutoff 184C 250V 10A BF184
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Brand: Aupo , Model No.: BF184Function Temperature : 184C , Rated Current: 10AHolding Temp.: 159C , Max. Temp: 210CRated Voltage: 250V(AC) , RoHS: YesApplications: Electric home appliances, electric industeial equipments, office automation equipments, plain paper copiers, transformers, motors, etc.
I live in Germany, so not sure how much use my sources would be. But in essence, it's one of those https://www.amazon.com/Aupo-Thermal-Fuse-Cutoff-BF184/dp/B0124KO99G. They're quite easy to integrate into the circuit - my silicone pad had 2 wires for AC. One I've connected directly to the line voltage in the plug, one to neutral through the SSR. I've cut the line wire quite close to the heater, soldered the thermal fuse in the break and then covered with high-temp RTV silicone (something like https://www.amazon.com/J-B-Weld-31314-Temperature-Silicone/dp/B00ID8IUJY/). And then once it hardened, added some more silicone. So it wont fall off or whatever. Maximum bed temp is set to 140 in my firmware, with the fuse breaking at 167, so I've got quite a bit of a leeway here. The downside is that if it does indeed fail - you're in for a lot of cleaning, it's not easy to rip that stuff from the silicone
Also if you do go down this route, I'd suggest looking up for to solder those fuses - I've destroyed the 1st one I've tried. Apparently, if you heat a thermal fuse with a soldering iron, they trip (who'd have guessed). What did it for me was soldering to the legs while the body of the fuse was submerged in icy water. I've also slid some heatshink on the fuse body and legs because the body is not insulated from the legs. All in all it was a bit of work but now I'm reasonably sure that my awesome 600W heated bed won't kill anything or set the house on fire.