Transcription of PTC thermistors, general technical information
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PTC ThermistorsGeneral technical informationDate:January 2016 EPCOS AG 2016. Reproduction, publication and dissemination of this publication, enclosures hereto and theinformation contained therein without EPCOS' prior express consent is AG is a TDK Group thermistors are ceramic components whose electrical resistance rapidly increases when acertain temperature is exceeded. This feature makes them ideal for use in countless applicationsof modern electrical and electronic engineering, for example as resettable fuses against currentoverload or as shortcircuit protection in motors. PTC thermistors are used in electronic lamp bal-lasts and switch-mode power supplies for delayed switching. You find special motor starter PTCthermistors in the compressors of refrigerators for instance. Thermal protection of motors andtransformers is another example of the versatility of PTC thermistors. The applications extend tomeasurement and control engineering, to entertainment, household and automotive electronics,plus data systems and telecommunications of course.
vidual types of PTC thermistors it is defined as the temperature at which the zero-power resis-tance is equal to the value Rref = 2 · Rmin. In the data sheet section we specify typical values of Tref. 5.1.5 Temperature coefficient α The temperature coefficient of resistance αis defined as the relative change in resistance re-
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