Varistor perfect surge limiter
Key Features of Varistors:
● High Surge Protection: Metal oxide varistors (MOVs) effectively protect against voltage spikes and surges, ensuring device safety.
● Fast Response Time: MOV varistors react immediately to surges, providing instant protection for sensitive electronics.
● Wide Voltage Range: Suitable for various applications, from consumer electronics to industrial systems.
● Durable and Reliable: Built with high-quality materials, these varistors offer long-lasting performance and reliability.
● Cost Effective, Easy Integration: Competitive price, Compact design and diverse models make MOV surge protectors easy to incorporate into any circuit.
What is a Varistor
A Varistor is a nonlinear resistor primarily composed of zinc oxide, used as a metal oxide semiconductor component,primarily used for surge protection in circuits. Varistors are classified into symmetric (non-polarity) and asymmetric (with polarity) types based on their voltage-ampere characteristics. This metal oxide varistor is highly sensitive to voltage; when a set voltage level is reached, the varistor's resistance conducts rapidly.
Due to characteristics of high effective nonlinear coefficient,large through-flow capacity,fast action and no continued flow, varistors are widely used for lightning surge protection and surge protector of electronic equipments,which could absorb various operating surge & lightning wave voltages effectively, protecting circuits from interference and damage.
Varistor Application
Varistors are extensively used in surge protection across various electronic engineering fields. Common applications include:
- 1.Telecommunications Surge Protection : Varistor protects telecom equipment from voltage spikes.
- 2.MOV Surge Protection for Electricity: Metal oxide varistor ensures the safety of electrical systems.
- 3.MOV for Surge Protection of Consumer Electronics: Used in devices like telephones,converter,power meter, power distribution cabinets, socket box, distribution box, power switch, voltage regulator, and more to prevent surge current damage.
- 4.Lightning surge protection: Enhancing the durability and performance of lighting solutions such as LED Lighting, power lightning protection box,lightning arrester (SPD surge protection special) etc.
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5.Surge Limiter for Automotive Applications:Varistors safeguard automotive electronics by protecting sensitive circuits from electrical transients, ensuring the reliability of control units and communication lines.
6.Power Supplies Surge Protection: protects power supply circuits from surges, ensuring reliable system operation.
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7.Industrial Equipments: Varistors safeguard industrial motors, drives, and control systems from voltage transients, ensuring efficiency and safety.
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8.Data Line Surge Protection: Metal-oxide varistor protects communication data lines from voltage surges, ensuring reliable transmission and safeguarding sensitive components.
- 9.Power Factor Correction Circuits: Varistors stabilize voltage and protect against transients in power factor correction, enhancing electrical system efficiency.
Application Examples
Examples of varistor applications include surge protection in motor and protected circuit:
Advantages of Varistors
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Varistor offers numerous benefits, making them essential components in electronic circuits:
- 1.Wide Voltage Range: Suitable for various voltage levels, ensuring broad applicability.
- 2.High Energy Tolerance: Capable of handling significant energy surges, protecting sensitive equipment.
- 3.High Nonlinear Coefficient: Provides effective surge suppression, safeguarding devices from voltage spikes.
- 4.Low Leakage Current: Ensures minimal power loss, enhancing energy efficiency.
- 5.Symmetrical V-I Characteristics: Delivers stable performance under varying electrical conditions.
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- 6.Low Residual Voltage: Minimizes the voltage remaining after a surge, reducing potential damage.
- 7.Fast Response Time: Reacts immediately to voltage spikes, offering timely protection.
- 8.No Continued Flow: Prevents unwanted current post-surge, protecting circuit integrity.
- 9.Excellent Voltage Ratio: Maintains stable operation across different voltage levels.
- 10.Strong Surge Protection: Effectively safeguards circuits from high-energy surges, extending device longevity.
- 11.Stable Voltage Suppression: Consistently inhibits voltage spikes, ensuring reliable protection.
- 12.High-Quality Materials: Crafted from superior materials for durability and performance.
- 13.Reliable Operation: Ensures long service life and dependable functionality.
- 14.Wide Application: Suitable for a wide range of industries and devices, enhancing overall utility.
Optimize your circuit protection with varistors that deliver performance, reliability, and versatility.
Varistor Key Features
Varistor Symbol
The standard varistor symbol in circuit diagrams is as below:
- Rectangle: Represents the resistor.
- Diagonal Line: Crosses the rectangle, indicating its function.
- Parallel Line Segment: Signifies the varistor's non-linear behavior.
This symbol is universally recognized in electrical schematics, ensuring quick identification by engineers and technicians working with electronic components.
Metal Oxide Varistor Main Specifications
Item | Parameter | Specification |
1 | Varistor Voltage | 18~1800V |
2 | Max. Allowable Voltage (AC/DC) | 10~1000V (AC) / 14~ 1465V (DC) |
3 | Max Varistor Clamping Voltage | 38-~ 2970V |
4 | Energy 10/1000µS | 0.4- ~ 2500 J |
5 | Withstanding Surge Current 8/20µS | 50-70000 A |
6 | Rated Power | 0.01-1.20 W |
Metal-Oxide Varistor Dimensions
Varistors come in various sizes depending on the specific series. Detailed dimension specifications can be provided based on the selected model.
Varistor Selection
Choosing the right Metal Oxide Varistor depends on your application’s voltage and energy requirements. Consider factors such as varistor voltage, maximum allowable voltage, and energy capacity when selecting the appropriate varistor.Main factors to consider include:
- Voltage rating.
- Current rating.
- Size and form factor.
- Varistor clamping voltage.
- Energy absorption capability.
- Reliability and lifetime requirements.
Varistor Working Principle
The working principle of a varistor is based on the nonlinear voltage-current characteristics of the material.When varistor in a rest state, relative to the protected electronic components, has a very high impedance (number megohm) without changing circuit characteristics of the original design.
When achieve the momentary surge voltage (more than breakdown voltage of the varistor), the varistor impedance will be low (only a few ohms.) and caused the original short circuit.In other words, electronic products or components are thus protected.
Metal Oxide Varistor Naming Rules
Varistors typically follow a naming convention that includes information about their voltage rating, size, and other specifications.
Details are as below:
- Metal Oxide Varistor Model List
Here is a main mov varistor datasheet:
Item | Varistor Series | Varistor Element Diameter |
Varistor Voltage | Max Allowable Voltage | Max Varistor Clamping Voltage | Energy 10/1000µS (J) | Datasheet | ||
(mm) | (V) | (AC) | (DC) | (V) | N(Standard) Series |
J(High Surge& High Energy) Series |
|||
1 | 05D | 5mm | 18 ~ 750 | 10 ~ 460V | 14 ~ 615V | 38 ~ 1240V | 0.4 ~ 22.4 | 0.6~32 | 05D Series Varistor datasheet |
2 | 07D | 7mm | 18 ~ 820 | 10 ~ 510V | 14 ~ 670V | 38 ~ 1355V | 1.0 ~ 69.2 | 3~104 | 07D Series Metal oxide varistor |
3 | 10D | 10mm | 18 ~ 1100 | 10 ~ 680V | 14 ~ 895V | 38 ~ 1815V | 2.8 ~ 133 | 3~155 | 10D Series Metal-oxide varistor |
4 | 14D | 14mm | 18 ~ 1800 | 10 ~ 1000V | 14 ~ 1465V | 38 ~ 2970V | 6.6 ~ 336 | 7.0~510 | 14D Series MOV varistor |
5 | 18D | 18mm | 18 ~ 1100 | 10 ~ 680V | 14 ~ 895V | 38 ~ 1815V | 7.2 ~ 252 | 11~495 | 18D Series MOV surge protector |
6 | 20D | 20mm | 18 ~ 1800 | 10 ~ 1000V | 14 ~ 1465V | 38 ~ 2970V | 6.1 ~ 560 | 13~860 | 20D Series surge suppressor varistor |
7 | 25D | 25mm | 18 ~ 1600 | 10 ~ 1000V | 14 ~ 1280V | 38 ~ 2640V | 13 ~ 805 | 20~970 | 25D Series mov metal oxide varistor |
8 | 32D | 32mm | 33 ~ 1600 | 20 ~ 1000V | 26 ~ 1280V | 65 ~ 2640V | 40~1080 | 32D Series mov surge suppressor | |
9 | 40D | 40mm | 200 ~ 1600 | 130 ~ 1000V | 170 ~ 1280V | 330 ~ 2640V | 40 ~ 1080 | 40D Series zinc oxide varistor | |
10 | 53D | 53mm | 200 ~ 1600 | 130 ~ 1000V | 170 ~ 1280V | 330 ~ 2640V | 550 ~ 2500 | 53D Series disk varistor | |
11 | 34S | 34x34mm Square | 200 ~ 1600 | 130 ~ 1000V | 170 ~ 1280V | 330 ~ 2400V | 330 ~ 1500 | 34S Series mov for surge protection |
Packing Specification of Varistors:
Varistor User Feedback and Summary
User Feedback of Varistors
Customers consistently praise Varistors for their reliability, fast response, and excellent surge protection capabilities. They are widely regarded as essential components for protecting sensitive electronic equipment from voltage spikes and surges.
Varistor Summary
Varistors, particularly metal oxide varistors (MOV), are essential for protecting electronic circuits from voltage surges and transients. With their fast response time, high energy tolerance, and reliable performance, MOV varistors safeguard a wide range of devices, including consumer electronics, telecommunications, and industrial equipment. Their nonlinear voltage-current characteristics make them highly effective in surge protection, ensuring the longevity and reliability of sensitive components. Choose the right MOV surge protector to enhance your system's durability and efficiency.
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