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Normally open and normally closed.
Normally closed - Is a contact that flows current in its normal state. Energizing it and switching it on will open the contact, causing it to not allow current flow
Index or horton thermal switch. Verify if your switch is a NC or a NO
https://catalog.hortonww.com/index.html?selectedTab=other&mode=thermalSwitches
http://www.indexsensors.com/temperature-switches.html