0070.2581.B1

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TVS- Varistors, MOVs

The 0070.2581.B1 is a type of Varistors, or MOVs (Metal Oxide Varistors) developed by Raychem Circuit Protection. It is a tiny, axial-leaded device specifically designed for overvoltage protection of electronic equipment.

Application Field

The 0070.2581.B1 is used in a wide variety of electronic applications. It is popularly used in high frequency switching power supplies, hybrid switching power supplies, lightning protection circuits, and telecom equipment, where it offers excellent protection from transient voltages created by lightning and other electrical surges. It is also suitable for use in power converters, computing circuits, and many other high voltage electronic systems.

Working Principle

At low voltages, the MOV does not conduct electricity. However, when the test voltage exceeds the MOV\'s rated voltage, the MOVs begin to conduct, directing a significant current to the ground, thereby limiting the voltage at the protected component.

The MOV absorbs the surge energy, but also experiences a temperature increase. The temperature increase is dissipated in the free air or other heatsinking device. While the MOV can absorb a large amount of energy (save for the dielectric breakdown), the temperature increase may cause it to fail. Therefore, it is typically recommended to use a heatsink to allow for a larger energy dissipation.

The efficiency and protection performance of varistors depend on the combination of several factors, including type and size of MOV selected, the amount of energy surge, the peak voltage, the operating temperature range, and the dissipated heat. By making the proper selection of all these factors, an optimization can be achieved.

Conclusion

The 0070.2581.B1 Varistor is designed for overvoltage protection of sensitive electronic components. It is used in many applications where protecting against high surge voltages is required and it can absorb and safely dissipate a large amount of energy. The degree of protection will depend upon the proper selection of the MOV device and the other factors associated with it.

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