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Product name: Overcurrent and overload protection PTC thermistor

Item: MZ31 series

PTC thermistor for protection of overcurrent and overload-MZ31 series--MZ10 type

Brief Introduction:
MZ 31 series 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.

Product Application:
overcurrent,overload and short circuit protection of general circuit,e.g. transformers,mico motor,switch power,electric energy meter, charger,adaptor,meter,apparatus,electronic coils,control panels,home appliances,air conditioning,microwave oven etc. Overcurrent protection of intelligent watt-hour meter RS485 interface, digital multimeter,micromotor and transistor.

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 quickly and 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.wide operating voltage range
6.small steady resistance
7.low rated current
8.small resistance,small size
9.stable for a long time
10.no need to be reset supply after overload
11.wide operating temperature range:
0 ~ +60°C (V=Vmax)
-25 ~ +125°C (V=0)
12.RoHS compliant

Choose guidelines of overcurrent and overload protection PTC thermistor:
In selecting PTC thermistor as overload protection component,firstly,make sure of the maximum operating current in the circuit(non-trip current of PTC thermistor) and maximum operating voltage,rated zero power resistance,and also the outlook and dimension should be also taken into consideration.

Marking of Part Number:

1.Series: PTC thermistors 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

PTC Thermistor 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.