Thermal Cutout - better approach, other devices?

Discussion in 'The Projects Forum' started by danl, Jun 28, 2015.

  1. danl

    Thread Starter Member

    Sep 24, 2013
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    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.
    printer  thrm cutoff.jpg
     
  2. #12

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  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    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
     
  4. #12

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  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Look on Digikey and Mouser
     
  6. danl

    Thread Starter Member

    Sep 24, 2013
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