... thermistors.it has a rated zero power resistance ,wehn in series inpower loop,it can control the wave of current ,the NTC thermistor ... will be descended to very low degree,but dissiparive power of the NTC thermistor can be neglected,it is used for ... and 30cn.Characteristicthsi products has some characterisctic as small volume and big power,strongly contronlling the wave of current ,fast reaction , ...