On 9/3/2014 12:23 PM, John Miles wrote:
Was the oven in a runaway condition? Like Bob, I've never seen a situation where the thermal fuse has actually done anything useful. It seems like the inner oven will go into full-blown China Syndrome before the thermal fuse on the far side of the outer PCB gets hot enough to fail. -- john, KE5FX Miles Design LLC
John, I have two now with open fuses; one where the thermistor went open and the thermal fuse did blow, and the other just the usual fatigue. So despite the layer of foam between the Oven part and the board it did get hot enough to blow in the one. With an open thermistor the oven stays full on.
I am waiting on Digikey to deliver some 43 cent (in qty 10 plus postage) Panasonic 1A 115C fuses, so I should be good for my lifetime... I'd still rather fit these at that price rather than link it out even if the odds are minuscule...
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