PTC Thermistor: MZ21-18R110
Description:
This is a very useful device for hobbyists to develop any breakout for over electric current limit protection purpose so as to keep components from burning.
Working Theories:
The restricting overloading protection PTC Thermistor is connected in series in the overloading circuit. when the circuit is in the normal working state , the current flowing through the PTC Thermistor is not high enough to make the temperature exceed the Curie temperature for protection ,and it is always in the low state of resistance. When the circuit breaks down and the return circuit current increases, the resistance of restricting overloading protection PTC Thermistor goes up sharply for being warm, until the circuit is cut off. After the clearing of the circuit trouble, the PTC Thermistor begins to cool and come back to the state of low resistance, and then the circuit enters normal working condition. When the circuit breaks down next time, the PTC Thermistor can enter the state of protection again.
Applications:
Restricting overloading protection PTC Thermistor is mainly used in the remote alternating machinery, remote control telephones, distributing frames, safe-guard units, voltage transformers, crystal conductors, automats, cars, washing-machines, fluorescence lamps, computer peripheral equipments, motor starters, household appliances, electronic instruments and micro power equipments at present.
Advantages:
Compared with the traditional fusing filament, the restricting overloading protection PTC Thermistor reacts fast, contactless, flameless, noiseless and recoverable. Meanwhile, compared with the organic high molecule PTC Thermistor, the pottery restricting current PTC Thermistor of normal temperature changes little after numerous protection with a better performance of withstanding voltage. Additionally, it can resume steadily and has a good performance. If hotly-coupling installed with overloading, it can repair the circuit trouble caused by the double effects of overheating and overcurrent.
