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过流过载保护用PTC热敏电阻器
主要品种
过流过载保护用的PTC热敏电阻器有：瓷片型，壳体型，包封型及贴片式等。
主要品种
过流过载保护用的PTC热敏电阻器有：瓷片型，壳体型，包封型及贴片式等。
过流过载保护PTC热敏电阻的工作原理
串联在负载电路中，当电路处于正常工作状态时，流过过载保护PTC热敏电阻的电流不足以使其自热温升超过过载保护PTC热敏电阻的居里温度，而总是处于低阻状态。 当电路出现故障使回路电流增大时，过载保护PTC热敏电阻的电阻值因自热温升而出现阻值阶跃，直至把电路切断。在电路故障排除后， 过载保护PTC热敏电阻冷却并恢复到低阻态，同时电路也进入正常工作状态。下次电路再出现故障时，过载保护 PTC热敏电阻又可以进入保护状态。
过流过载PTC热敏电阻器的应用
程控交换机、程控、配线架、保安单元、变压器、晶体管、自动售货机、汽车、洗涤机、荧光灯、计算机外设、电机启动器、家用电器、电子仪表及小型电源设备中。
串联在负载电路中，当电路处于正常工作状态时，流过过载保护PTC热敏电阻的电流不足以使其自热温升超过过载保护PTC热敏电阻的居里温度，而总是处于低阻状态。 当电路出现故障使回路电流增大时，过载保护PTC热敏电阻的电阻值因自热温升而出现阻值阶跃，直至把电路切断。在电路故障排除后， 过载保护PTC热敏电阻冷却并恢复到低阻态，同时电路也进入正常工作状态。下次电路再出现故障时，过载保护 PTC热敏电阻又可以进入保护状态。
过流过载PTC热敏电阻器的应用
程控交换机、程控、配线架、保安单元、变压器、晶体管、自动售货机、汽车、洗涤机、荧光灯、计算机外设、电机启动器、家用电器、电子仪表及小型电源设备中。
过流过载PTC热敏电阻器的优点
和传统的熔断丝相比，过流过载保护PTC热敏电阻具有反应快、无触点、无明火、无噪声和可恢复性强等优势，和有机高分子PTC热敏电阻相比，陶瓷过流保护PTC热敏电阻在实现多次保护后常温电阻变化不大，耐电压性能较好，恢复性能、稳定性能优良。如果把它与负载进行热耦合安装，可对过热和过流双重作用导致的电路故障进行保护。
和传统的熔断丝相比，过流过载保护PTC热敏电阻具有反应快、无触点、无明火、无噪声和可恢复性强等优势，和有机高分子PTC热敏电阻相比，陶瓷过流保护PTC热敏电阻在实现多次保护后常温电阻变化不大，耐电压性能较好，恢复性能、稳定性能优良。如果把它与负载进行热耦合安装，可对过热和过流双重作用导致的电路故障进行保护。
PTC Thermistors for Restricting Overloading and Current
Main Categories
According to the appearance, the PTC Thermistors for restricting overloading and current can be divided into some categories, such as porcelains, shellies, wrapping and pasters.
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 ephones, 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.
