In this a automatic thermometer is installed which is detect high heat of the kettle and switch off the kettle.
That last answer is so stupid. It doesn't 'detect how much water is in the kettle'! Try turning your kettle on with no water in it at all - it won't magically shut off.Most modern kettles use a steam based cutoff switches. I have just taken my kettle apart (as it's old and isn't working … Read more