One of the references used in this article, "PolySwitch Resettable Devices Fundamentals" (PDF) [0], is also worth checking out as it includes a couple illustrat

One of the references used in this article, "PolySwitch Resettable Devices Fundamentals" (PDF) [0], is also worth checking out as it includes a couple illustrations which help explain how the device works and operates. This might be a better resource for people who are more visual learners. [0] https://web.archive.org/web/20150122051210/http://www.te.com/content/dam/te/global/english/products/Circuit-Protection/knowledge-center/documents/polyswitch-fundamentals.pdf https://web.archive.org/web/20150122051210/http://www.te.com...