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What is a metal oxide variable resistor (MOV)?
Dec 9, 2019 · The MOV varistor starts conducting when a specific voltage is applied across the connecting leads and stops conducting when the voltage falls below the threshold voltage. MOVs are available in various formats like disk format, axially leaded devices, blocks and screw terminals and radial leaded devices.
basic application guidelines: Basics What is a Littelfuse MOV? An MOV is a Metal Oxide Varistor. Varistors are voltage dependent, nonlinear devices which have an electrical behavior similar to back-to-back Zener diodes. The varistor's symmetrical, sharp breakdown characteristics enable it to provide excellent transient suppression performance. When
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- Understanding Metal Oxide Varistors
- Principle and Construction
- How Does A Mov Work?
- Different Types of Movs and Their Applications
- Choosing The Right Mov
- Limitations and Alternatives
- Conclusion
The field of electronics is filled with a vast range of components that each serve unique and critical roles in circuit designs. One such component is the Metal Oxide Varistor (MOV). The MOV is a voltage-dependent resistor with a nonlinear voltage-current characteristic that is symmetrical around zero. But what exactly does this mean and why is it ...
At its core, the Metal Oxide Varistor is a type of resistor – the basic electrical component that regulates the flow of electricity in a circuit. The term ‘varistor’ is a portmanteau of ‘variable resistor’. This implies that unlike typical resistors, the resistance provided by a MOV changes with the applied voltage. The MOV is primarily constructed...
A Metal Oxide Varistor functions based on its voltage-current characteristics. Under normal conditions, when the voltage across the MOV is below the ‘clamping voltage’ or ‘varistor voltage’, the MOV behaves as a high-resistance component. This means it allows very little current to pass through. However, when the voltage surpasses the clamping volt...
Metal Oxide Varistors come in several varieties, each designed to cater to specific needs and applications. Some common types include: 1. Disc Varistors: These are the most common type of MOVs. They are typically used in power lines, control systems, and surge protection devices. 2. SMD Varistors: Short for Surface Mount Device Varistors, these are...
When choosing a Metal Oxide Varistor, one of the most critical specifications to consider is the varistor voltage. This voltage should be slightly higher than the maximum normal operating voltage of the circuit to avoid unnecessary activation of the MOV. Another vital factor is the MOV’s energy rating, which should be high enough to handle the ener...
While MOVs offer excellent surge protection, they do have limitations. For instance, they are susceptible to degradation over time due to repeated voltage surges. Also, they can be destroyed by high energy transients. In such cases, other protective devices like gas discharge tubes, silicon avalanche diodes, or transient voltage suppressor diodes m...
In conclusion, Metal Oxide Varistors play an integral role in protecting electronic circuits from potentially damaging voltage surges. Understanding the basic principles of their operation, their various types, and their application areas can assist in making an informed decision when selecting the appropriate MOV for a specific need. However, it’s...
Metal oxide varistors consist of approximately 90% zinc oxide as a ceramic base material plus other filler materials for the formation of junctions between the zinc oxide grains. Metal oxide varistors are now the most common type of voltage clamping device and are available for use at a wide range of voltages and currents.
work and lives. Metal Oxide Varistor (MOV) is one of the most common safety devices in power systems. This paper will elaborate MOV’s principle, structure, characteristics and selection principle. Then the paper will analyze and summarize the typical applications of MOV in power systems.
The AUMOV® Varistor Series is designed for circuit protection in low voltage (12VDC, 24VDC and 42VDC) automotive systems. This series is available in five disc sizes with radial leads with a choice of epoxy or phenolic coatings. The Automotive MOV Varistor is AEC-Q200 (Table 10) compliant.
Introduction. An attractive property of the metal oxide varistor, fabricated from zinc oxide (ZnO), is that the electrical characteristics are related to the bulk of the device. Each ZnO grain of the ceramic acts as if it has a semiconductor junction at the grain boundary.
