Kingtronics Blog

The use principle of Varistor is that after it is connected to the protected equipment, it cannot affect the normal operation of the equipment, and can effectively implement instantaneous overvoltage protection for the equipment. Therefore, in addition to the technical parameters of Varistor, the following issues should be considered in the actual selection:

(1) Selection of voltage sensitivity
Considering the deviation between the actual Varistor voltage and the nominal voltage (1.1~1.2 times of the nominal voltage should be considered), the possible fluctuation range of the power supply voltage in the AC circuit (1.4~1.5 times of the rated voltage should be considered), and the relationship between the peak value of the AC voltage and the effective value (1.4 times should be considered), the Varistor with a voltage sensitive of 2.2~2.5 times of the rated voltage should be selected. In DC circuits, Varistor with a voltage sensitive of 1.8~2 times the rated value of DC voltage are often selected.

⑵ Selection of flow capacity
In principle, the selection should be based on the maximum transient surge current that may be experienced, but achieving this is difficult. In practice, the selection of Varistor is based on the use occasion or the test grade specified in the product test standard.

According to the former, 1kA (8/20 μ S current wave) can be used for the protection of silicon controlled rectifier; 3kA is used for surge absorption in electrical equipment; 5kA is used for overvoltage absorption of lightning strikes and electronic equipment; 10kA is used for protection against lightning strikes. According to the latter, the commonly used composite wave (1.2/50 generated when the generator is open circuit output) μ Voltage wave of s; 8/20 generated during short-circuit output μ Current wave of s; The internal resistance of the generator is 2 Ω to assess the equipment's ability to withstand lightning surge interference online. During the 4kV test, the maximum current absorbed by the protector can reach 2kA; For the 6kV test, the maximum absorbed current is 3kA. However, in actual selection, the flow capacity of the selected Varistor should also be appropriately increased. Because Varistor with large current passing capacity should have relatively small residual voltage drop when absorbing surge current of the same size; At the same time, there is also a large protection margin for the selected Varistor.

⑶ Inherent parasitic capacitance
Varistor has an inherent capacitance problem. Its value ranges from hundreds to thousands of pF according to the difference of external dimensions and nominal voltage. The inherent capacitance of Varistor determines that it is not suitable for use in high-frequency occasions, or it will affect the normal operation of the system; Suitable for use in power frequency systems, such as for protection of power incoming lines, protection of thyristor rectifiers, etc.

The instantaneous power of Varistor is relatively large, but the average continuous power is very small, so it cannot work in the conduction state for a long time.https://www.kingtronics.com/Metal-Oxide-Varistor/XKT-Metal-Oxide-Varistor.html 

Kingtronics Kt 05D to 20D Metal Oxide Varistor Features
Operating Temperature Range: -40℃~+105℃
Body Diameters Range From 5D to 20D
Wide Operating Voltage from 18V to 1800V
Full compliance with RoHS and REACH

Kingtronics Kt 05D to 20D Metal Oxide Varistor Applications
Industrial equipment
Home appliance
Industrial equipment
Lighting products
Telecommunication or telephone system

Metal Oxide Varistor (XKT series) is Kingtronics strong production line.

We offers Metal Oxide Varistor (MOV) from 05D to 20D with high quality at incredibly aggressive prices.
¬Product video: https://youtu.be/JlZ5yg4GsBU

Features:
Operating Temperature Range: -40℃~+105℃ 
¬Body Diameters Range From 5D to 20D
¬Wide Operating Voltage from 18V to 1800V
¬Full compliance with RoHS and REACH 

Applications:
¬Industrial equipment,
¬Home appliance,
¬Industrial equipment,
¬Lighting products,
¬Telecommunication or telephone system
¬Any many other

Contact us with you inquiry today!

Kingtronics would like to share our another strong production line: XKT Metal Oxide Varistors.
Radial leaded varistor devices be use in electrical surge protectors which protect against overvoltage transients. it can protect rectification diodes, SCRs, power transistors, semiconductor devices, etc.
High Quality with excellent price and lead time support, welcome your inquiry. 
Product datasheet: https://www.kingtronics.com/pdf/XKT-Metal-Oxide-Varistor.pdf
Kingtronics Kt 05D to 20D Metal Oxide Varistor product video: https://www.youtube.com/watch?v=JlZ5yg4GsBU

•       Operating Temperature Range: -40℃~+105℃
•       Body Diameters Range From 5D to 20D
•       Wide Operating Voltage from 18V to 1800V
•       Full compliance with RoSH and REACH

Applications: Industrial equipment, Home appliance, Industrial equipment, Lighting products, Telecommunication or telephone system

Metal oxide Varistors ( MOV, Metal Oxide Varistor ) are voltage dependent resistors with symmetrical voltage-current characteristics which are designed to protect all kinds of electronic devices or elements from switching pulse or induced lightening surges. Its non linear characteristic with broad application range, mass production feasibility are gradually being used in various level of electric and electronic device from low to high voltages level protections ( AC11V- 1000 V as available ranges ).

Kingtronics offers high quality XKT 05D to 20D Metal Oxide Varistor at incredibly aggressive prices, following are our product data, welcome your inquiry!

Product datasheet: https://www.kingtronics.com/pdf/XKT-Metal-Oxide-Varistor.pdf

**Features
Operating Temperature Range: -40℃~+105℃
Body Diameters Range From 5D to 20D
Wide Operating Voltage from 18V to 1800V
Full compliance with RoSH and REACH

**Applications：
Industrial equipment
Home appliance
Industrial equipment
Lighting products
Telecommunication or telephone system

Christmas/New Year Holidays are around the corner, various customers have released their orders to us for a better L/T.

No doubt L/T near Xmas/New Year will be extended, it’s always wise to make schedule earlier.

Welcome send your order plan to us in Nov., we can give you a better lead time!!

Here is the information about our best sellers.

Kingtronics-ElectronicsAsia-2019-Capacitors.pdf

Kingtronics product portfolio offers 7mm（XKT7D）radial leaded varistor devices which protect against overvoltage transients. As transformers, relays and coils, XKT7D can protect rectification diodes, SCRs, power transistors, semiconductor devices, etc.
Varistor Voltages: 18 V- 910 V
Maximum Allowable Voltage(ACrms): 11 V- 550 V
Nominal Varistor Voltage: 101K- 911K
Standard Size: 10x12.5mm
Operating temperature range: -40℃~+105℃
Full compliance with RoHS and REACH
Please feel free to share business chance with us if have possible demands! We’re willing to help!
More information:info@kingtronics.com

After several months research and repeated testing, Kingtronics MOV(metal oxide varistor) XKT5D were launched to market successfully ,which series of 5 mm radial leaded varistor devices for protects against overvoltage transients such as lightning, power contact and power induction.
Varistor Voltages: 18 V- 680 V
Maximum Allowable Voltage(ACrms): 11 V- 420 V
Nominal Varistor Voltage: 101K- 681K
Standard Size: 8x11mm
Operating temperature range: -40℃~+105℃
Full compliance with RoHS and REACH
If you have intention to place an order, please hurry to contact with us! please do not hesitate to send your inquiries to us by info@kingtronics.com

Metal Oxide Varistor (MOV) is the most commonly used type of varistor. It is called so as the component is made from a mixture of zinc oxide and other metal oxides like cobalt, manganese and so on. When electrical current rises to a certain point, called the breakover point or breakover voltage, the tiny zinc oxide particles begin conducting the current among themselves only. This prevents the high-voltage current from passing into the rest of the surge protector or the devices plugged into it.
Kingtronics traditional radial through-hole metal oxide varistor devices are available in diameters of 5mm(XKT5D), 7mm(XKT7D), 10mm(XKT10D), 14mm(XKT14D)and 20mm(XKT20D).And it offers a choice of wide operating voltage from 18V to 1800V, operating temperature range -40℃~+105℃ and full compliance with RoSH and REACH.
The devices have high current handling, high energy absorption capability and fast response times to protect against transient faults up to rated limits. They are fit for providing voltage surge protection for a wide variety of applications, including the consumer electronics, industrial electronics ,communication electronics, measuring and controlling systems electronic home appliances. We are always looking for better solutions for our customers to face the severe market environment and fierce market.

Ever wondered how England got its name? As with countless other countries, it's all down to a tribe of early settlers (in this case, the 5th Century Angles).

In fact, almost every country in the world is named after one of four things: 1) a tribe; 2) a feature of the land; 3) a directional description; or 4) an important person. That's according to Quartz, which analyzed 195 countries listed in the Oxford Concise Dictionary of World Place-Names.

1. Tribe names

England is in good company with the lion’s share (about a third) of the world’s countries named after an early tribe or ethnic group.

• FRANCE – Named after the Franks, who conquered the land in the Medieval ages.
• VIETNAM – Named after the Viets of the South.
• THAILAND – Relates to the “tai” people, an ethnic group from the central plains region.

2. Important people

• PHILIPPINES – Named by Spanish explorer Ruy López de Villalobos, in honor of King Philip II of Spain in 1542.

3. Land features

• ICELAND – This moniker translates to "Land of Ice," perhaps for obvious reasons, from the ancient language of Old Norse. It is said to have been named by Norwegian Viking Hrafna-Flóki Vilgerðarson in 856 AD.
• HAITI – This Caribbean country’s name translates to "mountainous land" in its indigenous Taíno language. It was colonized by Spain in 1492 and later renamed “Haiti” in 1804 by former slave and revolutionary Jean-Jacques Dessalines, who declared himself emperor and took back the land.
• BARBADOS – This name translates to ‘the bearded’ in Portuguese, which is thought to be due to the long hanging roots of the fig trees that were noticed and marveled at by colonizers in the late 16th Century.

4. Location

• AUSTRALIA – First coined by the Ancient Greeks, Australia translates to “Unknown Southern Land,” but was officially declared by this name in the early 1800s by English cartographer Matthew Flinders.
• NORWAY – This country traces its name to the Old English term for “northern way,” first mentioned in 880 by the Anglo-Saxons.
• JAPAN – Nippon, which is the name commonly used by Japanese natives, means “land of the rising sun,” referring to its geographical location.

There do exist a small number of countries with quirky and imaginative names:

• Bhutan, which calls itself Druk Yul, means "land of the thunder dragon" on account of the magnificent storms that tear through the Himalayas.
• Nepal, one theory of the origin of its name makes reference to Kathmandu's sheep-rearing history, given that in Tibetan, "ne" means "home" and "pal" means "wool" - thus "the home of wool."
• Nauru, one of the world's most remote islands and the smallest state in the South Pacific, might take its name from the native term "anáoero," meaning "I go to the beach."