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Scientific Essay from the year 2024 in the subject Engineering - Automotive Engineering, , language: English, abstract: The new material PTC has found its way into technology due to its special properties. The powdered ceramic raw material is prepared into a semi-finished product in a preparatory process by forming compression with subsequent sintering in order to be usable as a material with special properties. The material PTC is a cubic electrical resistor with the special property of increasing the internal resistance by leaps and bounds when the Curie temperature is reached, in order to reduce the current flow in a small temperature range until it is completely switched off. The safety feature of the PCT is the decisive criterion compared to an electric heating wire to avert fire hazards in the event of inadequate cooling. The PCT has been used in the automotive industry in low-voltage and high-voltage PTC heaters. Due to its special properties, PTC has been used in electrical components such as the PTC thermistor. In this article, a calculation method is developed for the material PTC in order to determine the thermal behavior of the PTC from an engineering point of view.