MZ2系列PTC熱敏電阻器MZ2 SERIES PTC THERMISTOR

     用于過流保護(hù)For Over-current Protection

 

產(chǎn)品特點(diǎn)FEATURES

MZ2系列PTC是一種自動保護(hù)，自動恢復(fù)，反復(fù)使用，無觸點(diǎn)，

無噪音，無火花的“萬次保險器”。

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

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

當(dāng)PTC處于常態(tài)時，阻值很小，不會影響到變壓器初、次級線

圈等被保護(hù)電路的正常工作。

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.

當(dāng)電路出現(xiàn)故障時，PTC陡然發(fā)熱，阻值聚增至高阻態(tài)，使電路

處于相對“斷開”狀態(tài)，保護(hù)電路。

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.

 

主要應(yīng)用APPLICATIONS

小型變壓器初級線圈，充電器、通信設(shè)備程控交換機(jī)保安單元、雷電浪涌保護(hù)電路及線路的過流過載保護(hù)

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

電能表，數(shù)字萬用表RS485接口專用的過流保護(hù)，數(shù)字萬用表的過流保護(hù)，微電機(jī)、晶體管的過流保護(hù)

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

 

典型應(yīng)用線路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.