Attachment shows a Selco disc thermostat, manual reset, opens at 250F, 125VAC, 15A, in a circuit intended to completely shut down a 3d printer if the build plate overheats.
Tstat: http://www.selcoproducts.com/products/om-250-qc

Need small size (this tstat is 1/2" dia.), mountable to bottom of plate, manual reset, 120VAC, preferred >15A. Less than $10-15.

Is there a better approach? I searched for a small 20A rated manual reset disc tstat, but couldn't find one.
Are there other devices that could be surface attached to the bottom of the plate?

Any comments/help appreciated. Thanks.

 

Klixon has always been a good source for me.
http://klixon.com/

 

Snap-disc (Klixon) thermostats have always worked well for me, as long as I don't need precision control. If +/- 5 or 10 degrees is good enough and you just need to switch more power, I'd suggest using the snap-disc to control a relay with a greater contact rating but you already have a relay. You can put the thermo disc in the control side of the relay, but that won't help if the relay fails shorted.

ak

 

Hmmm...small...manual reset...how about one of those fusible links rated for 120C to 125C?

http://forum.allaboutcircuits.com/t...n-on-heatgun-suggestions-on-replacing.112967/

 

Look on Digikey and Mouser

 

Thanks.
This is what I ended up getting...
http://www.alliedelec.com/selco-om-302-qcv/70098666/

Seemed that finding a 120V, 20A resettable in 1/2" size was harder than I thought. Selco from Allied was the only one I saw and it was only 15A.