V07E11P Circuit Protection

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TVS - Varistors, MOVs

A V07E11P application field and working principle are extremely important to consider when dealing with transient voltage suppression. Transient voltage suppressors (TVSs) are designed to protect electronics from damage from fast surges in voltage, also known as transients. TVSs come in two varieties: varistors and metal oxide varistors (MOVs). Understanding the differences between these components, as well as their primary applications and working principles, is important in choosing the right protective component to use in your circuit.

Varistors

Varistors are nonlinear voltage-dependent resistors. When an electrical voltage or current passes through them, the varistor\'s resistance will change accordingly. Varistors essentially act as voltage-controlled switches, which open and close automatically depending on the voltage level. They are used in circuits to protect the components and other electronic devices from minor surges in voltage. Varistors also act as a clamping device and limit the voltage level within a set range.

Metal Oxide Varistor (MOV)

Metal oxide varistors (MOVs) are similar to varistors in that they are also nonlinear voltage-dependent resistors. However, MOVs are designed to react more quickly and with higher current ratings than varistors, making them an excellent choice for protection from heavy surges. Unlike varistors, MOVs are non-self-healing components, which means that they will not restore itself once the surge has occurred. Because of this, it is important to make sure the MOV ratings are properly specified and sized for the application to protect against damage.

Applications

Varistors and MOVs are used in different applications. Varistors are primarily used in circuit protection from minor surges, such as power that typically comes from a lightning strike or power line fluctuation. They can be used in a variety of circuits, from automotive to consumer electronics. MOVs are typically used for power line protection from heavy and damaging surges, such as those that come from lightning strikes. MOVs can be used in a variety of different circuits, from industrial automation to residential power protection.

Working Principle

The working principle behind varistors and MOVs is the same: as the voltage level increases, the resistance of the component decreases. The more the voltage level increases, the lower the resistance of the component. This means that the varistor will act as an open switch and the MOV will act as a closed switch if the voltage level reaches a certain point. Both types of components will then limit the voltage level to a safe range. Varistors and MOVs are designed to protect sensitive electronic devices from surges and transients in the voltage.

Conclusion

Varistors and MOVs are both important components for circuit protection from surges and transients in the voltage. Varistors are primarily used for minor surges while MOVs are used for major surges. Both components work by changing their resistance at different voltage levels, allowing them to limit the voltage level to a safe range. Understanding the differences between these components, as well as their applications and working principles, is important in choosing the right protective component to use in your circuit.

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