wrote:

On Tuesday, May 27, 2008 at 5:12:51 AM UTC-5, Gareth Magennis wrote:
Hi,

I have 2 parts in a SMPS that I think are PTC thermistors. One is marked
KC103P, the other KC221K, the first a blue disk looking just like this:
http://uk.farnell.com/jsp/level5/mod...=en/207356.xml

The PTC thermistors are from Keystone Carbon Corp., I used these some years
ago. Not sure they are in business anymore, but the line may have been
picked up by one of the components manufacturers.

I did find this :
https://www.galco.com/buy/Keystone-C...Company/KC010L

But that might be new-old stock.

Jon