MZ2系列PTC热敏电阻器MZ2 SERIES PTC THERMISTOR

     用于过流保护For Over-current Protection

产品特点FEATURES

MZ2系列PTC是一种自动保护，自动恢复，反复使用，无触点，

无噪音，无火花的“万次保险器”。

PTC of MZ2 series is a million- time safety device of automatic protection,

recoverability, using repeatedly, and no trigger ,noise or sparks.

当PTC处于常态时，阻值很小，不会影响到变压器初、次级线

圈等被保护电路的正常工作。

When PTC is in the normal state, the resistance is too low to affect the regular work

of the protected circuit such as the voltage transformer’s primary and secondary loops.

当电路出现故障时，PTC陡然发热，阻值聚增至高阻态，使电路

处于相对“断开”状态，保护电路。

When the circuit is in disorder, the PTC will generate heat suddenly, and the resistance value will go up to the high state,. which can make the circuit in the state of relatively “breaking up” to protect the circuit.

主要应用APPLICATIONS

小型变压器初级线圈，充电器、通信设备程控交换机保安单元、雷电浪涌保护电路及线路的过流过载保护

Overload and current protection of mini voltage transformer primary loops, chargers, safety guard unit and thunder surging protection circuit of telecom apparatus, and industry-controlling exchangers

电能表，数字万用表RS485接口专用的过流保护，数字万用表的过流保护，微电机、晶体管的过流保护

Over-current protection of ammeter, digital multi-meterRS485interface, micro-electricity machinery and transistor

典型应用线路TYPICAL APPLICATIONS CIRCUITS

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 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.