ptc thermistor for overcurrent and overload protection mz8-九游会下载

brief introduction:

mz31 series mz8 type ptc thermistor is a million- time safety thermistor of automatic circuit protection,recoverability, using repeatedly, and no trigger, 

noise or protective component that could protect and restore from abnormal temperature and current automatically,which called "auto restore fuse" and 

"ten-thousand-time fuse".recoverability, using repeatedly, and no trigger, noise or sparks. 

working principle:

as indicated in fig 2 as below,when circuit is in the normal state, the current through ptc thermistor is lower than the rated current and ptc thermistor 

is in the normal state with small resistance value,which will not affect the normal operation of the protected circuit such as primary and secondary loops 

of the voltage transformer.in case of some trouble in the circuit and the current is bigger than the rated current,the ptc thermistor will become hot 

quicklyand present high resistance value, which sets the circuit relatively “off” to protect the circuit from damage.after the trouble is removed,ptc thermistor

will automatically restore its low resistance state and the circuit will resume normal operation.

applications:

overvoltage protection,overload protection of digital multimeter,micromotor and transistor etc.

advantages:

1.automatic circuit protection,can resume steadily ;

2.contactless,noiseless and flameless;

3.reacts fast;

4. with a better performance of overvoltage protection；

5.small steady resistance;

6.low rated current. 

7.rohs compliant. 

marking of part number:

1.series:ptc thermistor for overvoltage protection

2.type:1-disc,2-encased,3-pin form-coating,4-pin form non-coating,5-smd

3.type:a-general, b-compount, c-moduie

4.chip size: 8-φ8mm          9-φ9mm         11-φ11mm      

5.curie temperature: f-50℃       h-75℃       n-100℃   p-120℃     k-125℃

6.r25 resistance: 6r0-6ω     6r5-6.5ω      70r-70ω      121-120ω 

7.resistance tolerance: k /-10%        m /-20%         h /-25%         n /-30%

8.greatly voltage:250-250v         265-265v

9.wire shape: s-straight, a-axis formed, u-in-formed

model number: