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Primarily, you can proceed with a temperature sensor LM35 and a relay module.
@OP:
You're basically building a thermostat as stated before. The fact that you only want it to cut out at a certain temperature isn't really relevant: it's still a thermostat.
Temperature is the most commonly measured process variable and as a result, there are thousands of different types of temperature monitoring/temperature control devices since the dawn of the industrial age.
If you're doing this as a (commercial) product, you don't need an arduino, etc; you need a temperature switch.
Here is an example device that will activate an output at a factory preset 105C. It can be ordered in 10C trip-point increments and costs $0.64 each at a quantity of 1,000. The single-unit price is $1.98.
Does that work? If not, why not?
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