Bimetal Switches

It is not that I don't trust Arctic 11 fans or have I every really had a fan fail in any pc but I want to use bimetal switches in my design just in case. 3 CXA 3070's will be ran in series using the cpu coolers with a switch on each cooler, can I run these bimetal switches in series?

Yes if you use the "normally closed" switches that would work.

Thank you, I have been searching but finding little information. Most applications use only 1 and I need 3 on a string in series. What is the max Celsius that these cobs can run? I don't want to buy a switch that will shut down to soon.

If you attach the switch the heatsink, you could go with a 40-45C switch. When the fan is running there is no way the heatsink would reach 40C, more likely 28-32C. If the fan fails the heatsink could reach 55-60C (I assume you are running at 1.4A). No sense letting it get that hot, might as well shut it down at 40.