Home » Products » PTC Thermistor » Overload protection » Overcurrent protection thermistor (MZ31)

Product name: PTC thermistor for overcurrent protection, MZ31 series

Item: MZ8

PTC thermistors for protection of overcurrent and overload-MZ31 series--MZ8 type

Brief Introduction:
MZ 31 series MZ8 type of PTC thermistor is a million- time safety device of automatic protection,recoverability, using repeatedly, and no trigger, noise or protective components 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.

PTC thermistor application:
overcurrent protection of digital multimeter, micromotor and transistor etc.

PTC thermistor Working principle:
As indicated in Fig as below,when circuit is in the normal state, the current through PTC is lower than the rated current and PTC 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 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 will automatically restore its low resistance state and the circuit will resume normal operation.

1.Automatic protection,can resume steadily ;
2.contactless,noiseless and flameless;
3.reacts fast;
4. with a better performance of withstanding voltage;
5.small steady resistance;
6.low rated current.

Marking of Part Number:

1.Series: PTC thermistor for overcurrent and overload 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

Dimension(Unit: mm):

Specification&Part No.:

Remarks:Except for the reference size and parameter above,different electrical parameter and encapsulation mode can be custom made per client's requirement.
You can send us required specifications to info@dxmht.com or provide reference samples to our factory office:
And then samples&orders can be custom made per your requirement.