00310045| Datasheet

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Application Notes Application notes
1 Application notes As to their possibilities of application, PTC thermistors can be divided in the following manner: a) by function Directly heated PTC thermistor Indirectly heated PTC thermistor

Heat is generated in the PTC thermistor

Heat is supplied from outside

Power PTC thermistors Applications where the electrical resistance is primarily determined by the current passing through the thermistor. b) by application Power PTC thermistors Fuse Switch Short-circuit and overcurrent protection Motor start Degaussing Switching Small heaters Thermostats Limit indicators Sensors

PTC temperature sensors Applications where the electrical resistance is primarily determined by the temperature of the medium surrounding the thermistor.

Temperature Limit temperature

Overtemperature protection Measurement and control Motor protection Overtemperature protection

Heater Level sensor 1.1

PTC thermistors for overcurrent protection

Ceramic PTC thermistors are used instead of conventional fuses to protect loads such as motors, transformers, etc. or electronic circuits against overcurrent. They not only respond to inadmissibly high currents but also if a preset temperature limit is exceeded. Thermistor fuses limit the power dissipation of the overall circuit by increasing their resistance and thus reducing the current to a harmless residual value. In contrast to conventional fuses, they do not have to be replaced after elimination of the fault but resume their protective function immediately after a short cooling-down time. As opposed to PTC thermistors made of plastic materials, ceramic PTC thermistors always return to their initial resistance value, even after frequent heating/cooling cycles.

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