This is an automatic switch used in many kettles. It might work for your kettle but with some imagination, you will find much application where you want to switch something when steam is detected. Because it is a switch and you can switch any voltage as long as it is not more than 250V with 13A current.
Electric Kettle Temperature Switch
Type: JB-01E 13A
Overload current: 13 A
Operating temperature: 20 ℃
Terminals: 2 Pin
Size: 4.6×2.2mm/1.81×0.87″ (LxW)