PPTC Thermistor Application Note Telecom applications Network equipment The telecom networks are potentially exposed to AC power crosses, thunder hazard, induced over current in the networks. The PPTC devices which are in series with line feed resistor and in paralleled with MOV will protect against these faults and prevent network equipments from damage. General electronic applications Industrial process controls Motors, fans and blowers If the motors are under overload, the extremely fine wire will be damaged by overheating. Install of PPTC in motors and blowers to prevent from overheating if overloaded. THINKING ELECTRONIC INDUSTRIAL Co., LTD. 1 www.thinking.com.tw 2008.07 PPTC Thermistor Application Note Battery applications Rechargeable battery packs Using strap type PPTC in series within battery pack will avoid the followed faults occurring. a. Shorting of the positive and negative terminals. b. A runaway charging condition in which the charger during charging, fails to stop supplying current to the package when it is fully charged. c. Using the wrong charger or the pack is reverse changed. Prismatic lithium battery THINKING ELECTRONIC INDUSTRIAL Co., LTD. 2 www.thinking.com.tw 2008.07