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TVS-Varistors, MOVs, are two of the most common surge protective devices. They provide a protective mechanism for electronic devices and systems from power surges and other electrical disturbances. In this paper, we will discuss the application fields and working principle of these devices.

Types of TVS-Varistors, MOVs

TVS-Varistors are silicon-based, non-linear, stand-alone voltage dependent resistors (VDRs) that are designed to rapidly and briefly provide current surge protection against overvoltage transients. Typically, these devices include one or more varistors (non-linear metal oxide elements) connected in a two or three lead configuration. Varistors can have a variety of encapsulation types such as radial, circular, DO-214, D2PAK, DO-35, DO-200 or DIL configured devices that provide a range of clamping voltages from 6.8V up to over 700V with voltage pulse ratings up to 1,500V and surge current ratings up to 10,000 amps. MOVs also commonly include varistor elements, but typically consist of metal oxide elements that are connected in series (MOVs) with a spark gap element (1 to 5 microsecond protection time) as an additional surge suppression element.

Application fields of TVS-Varistors, MOVs

TVS-Varistors and MOVs are typically used in a variety of applications, such as power supplies, communication equipment, and data transmission networks. Varistors and MOVs provide robust overvoltage protection for sensitive electronic systems and ensure the reliable operation of various products and services. They are widely used in aerospace, military, automotive, telecommunications, medical imaging, and industrial applications. In addition, they also provide overvoltage protection for low-voltage residential and commercial applications.

Working Principles of TVS-Varistors, MOVs

TVS-Varistors and MOVs work by providing a low resistance path for current flow that is triggered when a transient voltage exceeds the clamping voltage of the device. When the transient voltage reaches the breaking point voltage level, the device begins to attenuate the over-voltage surge, re-directing the current to ground and limiting the voltage to the protected device to an acceptable level. For TVS-Varistors, once the current has passed, the device quickly resumes its low-state resistance to ground and is ready for the next transient. For MOVs, because of the spark gap element included, the spark gap remains conducting for a longer time, resulting in MOVs having a somewhat slower response time than TVS-Varistors.

Conclusion

In conclusion, TVS-Varistors and MOVs are two of the most commonly used surge protection devices that provide effective overvoltage protection. They are suitable for a wide range of applications and have a wide range of clamping voltages and surge current ratings. Their working principle is based on their ability to quickly attenuate over-voltage surges, and to resume low-state resistance to ground after the surge.

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