thermal kill switches; where to get?

[Joseph Mack]

RGB talks about thermal kill switches in his on-line book.
With google, I could find lots of kill switches (motorcycle,
boat) thermal kill/shut off/safety switches seem to come
already built into something else. Does anyone know where
to get them?

Thanks Joe
-- 
Joseph Mack PhD, Senior Systems Engineer, Lockheed Martin
contractor to the National Environmental Supercomputer Center, 
mailto:mack.joseph at epa.gov ph# 919-541-0007, RTP, NC, USA