== Eksterne henvisninger ==
* [https://web.archive.org/web/20110317064821/http://circuitprotection.com/faqs.asp PolySwitch Resettable Devices Faqs]
* {{PDFlink|[https://web.archive.org/web/20160303165554/http://www.bourns.com/data/global/pdfs/bourns_mf_ptc_short_form.pdf Bourns MultifuseResettable Fuses - Polymer PTC & Ceramic PTC Short Form Brochure (1.2MB)]|1.26&nbsp;MB}}
* [http://krdev.littelfuse.com/searchresults.html?NPart=Technology%3a162 Littelfuse Polyfuse Resettable PTC Devices] {{Webarchive|url=https://web.archive.org/web/20071102154459/http://krdev.littelfuse.com/searchresults.html?NPart=Technology%3A162 |date= 2. november 2007 }}
Jura Samfund Teknologi Sikkerhed