C 890
thermistors for overcurrent protection
* by Epcos
* overcurrent and short-current protection
* leaded discs coated
* pitch 5.08mm
* ceramic PTC thermistors provide overcurrent protection for single-phase motors, transformers etc. as well as electronic circuits (subscriber line interface cards)
* the ceramic PTC resistor contrary to PTC's are polymer-based and after repeated cooling returns to its initial resistance value
* by responding to inadmissibly high currents and protecting pre-selected temperature limits which have been exceeded: the thermal dissipation from the complete power circuit is limited, as the increased resistance of the current is reduced to a harmless residual value
* the PTC resistor must not be exchanged after the maximum temperature has been exceeded, as after a short cooling period, the protective function immediately takes over