Looking for a thermal switch

[p14u5h]

Hi guys

We have a small SPST mechanical switch, capable of switching from 0.2 to 20 milliamperes into a resistive load at 10-32 VDC. Now we are planning to add a thermal switch to it in series which shall stay open below 115F, close the circuit above 120± 5F. The switch shall open again when temperature drops to 80±5 F. The switch shall be able to handle 100,000 cycles.
I am looking for a very small thermal switch of size ¼ inches or less. I have googled a lot but to no avail. I have a thermal switch which failed due to some reason and which is smaller than ¼ inches, has two pins on it, but I do not know the source for buying.

Can anybody suggest me what kinda switch it might be and from where I can buy.


Thanks in advance

 

[Sceadwian]

Try Digikey, they sell polyfuses which work as you describe.

 

[p14u5h]

Try Digikey, they sell polyfuses which work as you describe.

Can you help me more on that. I could not find any polyfuses on their site. Also are they really thermal switch or sth else

 

[Sceadwian]

How about these?
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=655696&k=thermal fuse

 

[mneary]

You may be looking a PTC resettable switch, except that they open at higher current/temperature.

 

[p14u5h]

Thanks Sceadwin
But I have gone through that before, and it's hard to find such small size thermal switch.

 

[p14u5h]

the most important criteria am looking for is the small size, along with meeting all other requirements. I have found few thermal switches but the size always was more than 1/2 inch length or dia. I am looking for sth less than 1/4 inches and I think its there in the market as I have a failed thermal switch of size .2 inches