SMZ13Series composite typePTCTechnical principle explanation of thermistor：
Mixed modePTCA thermistor is a composite type consisting of a positive temperature coefficient thermistor and a varistor packaged together through a special processPTC。
In this device, a positive temperature coefficient thermistor is a self recovering protective device that is sensitive to both temperature and current, commonly known as a ten thousand fuse. Zinc oxide varistors are nonlinear overvoltage protection components that cannot withstand sustained high currents. When these two components are packaged together, the entire composite typePTCThe working principle process of is shown in the following figure
Combine this composite typePTCConnect to the circuit in the order of the pins shown in the diagram, under normal conditions（AC220±20%）The varistor does not work, and the thermistor is connected in series in the circuit as a current limiting resistor, which has no impact on the protected circuit.
Under overvoltage state: firstDC390VThe response of the varistor is to clamp the fault voltage. Continuing，PTCThe temperature of a thermistor rapidly rises due to the thermal coupling effect of self heating and varistor caused by fault current. The increase in resistance results in a short period of time to bear the partial voltage, reducing the overvoltage value of the varistor and the protected circuit, achieving a protective effect. When the overvoltage state disappears and the components dissipate heat, they return to normal and return to their original state.
From the principle, it can be seen that this component utilizes the temperature and current generated by the overvoltage of the thermistor to make the thermistor respond quickly. By utilizing the increase in thermistor value after the thermistor responds, it affects the voltage and current, which in turn provides a comprehensive protection effect on the mutual influence between the varistors. For example, the one we designedDCThe pressure-sensitive voltage in the state is360-450vThe minimum AC opening voltage of the varistor is154Vac，Basically, it can meet all the requirements220VTransformer primary1.9Protection requirements for double overvoltage.
Based on the above characteristics, the composite typePTCCan be widely used in industries such as electric energy meter, household appliance control power supply, high-power lighting, etc.
Encoding rules：
Model Example：
|
NO |
model |
Zero power resistance value |
Varistor value |
Maximum voltage |
Maximum current |
Curie temperature |
Voltage withstand |
|
Ω |
Vac |
Vac |
A |
℃ |
Vac |
||
|
1 |
SMZ13-06 10D431RM |
200-1000 |
430±10% |
265 |
0.3 |
75-115 |
450 |
|
2 |
SMZ13-06E101-181RM10D431 |
100-180 |
430±10% |
265 |
0.3 |
110±10 |
450 |
|
3 |
SMZ13-06E151-251RM10D391 |
150-250 |
390±10% |
265 |
0.3 |
110±10 |
420 |
|
4 |
SMZ13-06E800-161RM10D391 |
80-160 |
390±10% |
265 |
0.3 |
110±10 |
420 |
|
5 |
SMZ13-08E121RN14D391 |
80-160 |
390±10% |
265 |
0.8 |
110±10 |
420 |
|
6 |
SMZ13-08E400-700RM14D471 |
40-70 |
470±10% |
265 |
0.8 |
110±10 |
500 |
|
7 |
SMZ13-08E400-800RM12D431 |
40-80 |
430±10% |
265 |
0.8 |
110±10 |
450 |
|
8 |
SMZ13-08E550RN12D391 |
40-70 |
390±10% |
265 |
0.8 |
110±10 |
420 |
|
9 |
SMZ13-08E600-121RM14D391 |
60-120 |
390±10% |
265 |
0.8 |
110±10 |
420 |
|
10 |
SMZ13-08E600-121RM14D621 |
60-120 |
620±10% |
265 |
0.8 |
110±10 |
700 |
|
11 |
SMZ13-10E300-500RM14D391 |
30-50 |
390±10% |
265 |
0.8 |
110±10 |
420 |
|
12 |
SMZ13-15E800-121RM20D431 |
80-120 |
430±10% |
265 |
0.8 |
110±10 |
450 |
|
13 |
SMZ13-16E280-500RM20D821 |
28-50 |
820±10% |
265 |
0.8 |
110±10 |
800 |
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