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subby asked how does a thermal limit switch work?
just a simple explanation please. im planning to use it to turn off an electromagnet, but im not sure if it will work. ok, i cant use a thermistor, so it will be the type with the bimetallic strip. if i run a hot nichrome wire over it and then cool off the wire, would that be enough to affect the bimetallic strip? im assuming that there are different switches set for different temperature cutoffs? (and for the electromagnet, i was planning to have the switch turn off because of the cooling, so then the current would cut off and the electromagnet would drop whatever it was holding up.)
And got the following answer:
Thermal switch can be either bi-metal or thermistor. Bi-metal switch is mechanical and consists of two metals of different heat coefficient characteristics bonded together. When heated the bi-metal strip bends, because one expands at a greater rate than the other. A thermistor is more "electronic" type where the resistance varies with temperature.(but not like a normal resistor ).There are 2 types PTC and NTC. The PTC, or Positive Temperature Coefficient, increases resistance with temperature, but on reaching it's designed operating temperature, resistance increases greatly with respect to temperature increase, therefore when used in conjunction with a thermistor relay unit will switch of at a desired temperature. Typical use being in motor overheat protection.
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