Varistor And The Metal Oxide Varistor
Why is it called a metal oxide varistor:Varistor and the Metal Oxide Varistor is sintered from different metal oxides, so it is called a metal oxide varistor
Most Common Varistor Materials：ZnO
Varistors of other materials：MgO、SiC、SrTiO3、CdSe、BaTiO3
Other materials currently in use：SiC、MgO、SrTiO3
Description
Technical Parameters
Product Description
Advantages and disadvantages of SiC varistors
Advantage：
A.Can work in higher environment, such as 150°C
B.Can be used in industrial oil tank and SF6 environment
C.Slightly higher charge rate
Shortcoming：
A.Non-linear characteristics are not strong
B.High Residual Voltage
C.Freewheeling
Advantages and disadvantages of MgO varistors
The main manufacturer is Fuji Electric in Japan, which also doped MgO in ZnO. This kind of varistor accounts for a very small proportion in the industry.
Advantage：
A. The voltage gradient performance is better, the field strength rises, up to 660V/mm, and has better flow capacity.
B. The leakage current is about 9.5μA, which is higher than that of ZnOVaristor, but within the limit value of 20μA.
Shortcoming：
A.The manufacturing cost is 3 to 5 times higher, and the qualified rate of finished products is low.
B.Adding MgO will form a sharp crystal of MgAl2O4, which will increase the resistivity of the ceramic body
C.Adding an appropriate amount of MgO can improve the temperature coefficient of resistance of ZnO ceramics. An appropriate amount of MgO can promote sintering and increase the density of ceramics, but excessive addition will reduce the density of ceramics.
Advantages and Disadvantages of SrTiO3
Advantage：
A. It has a high capacitance, so it can be used in micro motors to eliminate sparks, protect carbon brushes, and suppress noise.
Shortcoming：
A.The application field is relatively narrow
B.Under the same voltage, the cost is about 4 times higher
Inference
It can be seen from the above that the varistor with the widest coverage and the greatest economic value is ZnO Varistor, that is, the ceramic body mainly composed of ZnO and Bi2O3. It has the advantages of high nonlinear coefficient and small dielectric loss. Our ZnO Varistor has complete specifications and models, welcome to purchase!
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