Rotary potentiometer is an adjustable electrical resistor that can be moved by means of a rotary motion.

This allows control processes to be implemented in various electrical or electronic systems, for example for volume control in multimedia devices.

Kingtronics offers RKT 3540S & 3590S with high quality and certification of ISO 9001.

Features and its advantages:
-Bushing mount precision potentiometer

-"Metal" shaft and bushing
Ideal as a bearing material
Improve efficiency, reduce vibration and noise, special anti-bite characteristics.

-"Wire wound" potentiometer
High power, better durability

-Multiturn potentiometer

Kingtronics-Characteristics of Kingtronics Trimming Potentiometer RKT 3540S & 3590S

Growing in the southern region of China, the sudden drop in temperature, maybe you think it is amazing. People could still wear T-shirts and shorts last month. This week, cold air hit and dropped by 10℃-20℃ overnight.

Last month, we had a warm activity in Guangxi Province, where we shared some clothes, shoes and blankets for children in mountainous areas. Now they can wear them all, and also can cover the blankets. We hope that students in schools will be warmer this winter.

Recently, we have received many letters from these students, some students express gratitude, while others tell us their needs. Kingtronics will do our best to meet the needs of students and provide them with a happy, healthy, and joyful childhood

Kingtronics Angle Charity Social Activity in 2023 Autumn

Tact Switches have a small footprint and come in many sizes and gram forces, can be used in many consumers electronic devices.

Kingtronics can support very competitive L/T around 5~8 weeks compared to other brands!
Welcome your inquiry and let us help you soar!
Contact us today: 
Skype: kingtronics.sales2
Applications: instrumentation, industrial controls, communications equipment, computers, security systems, automotive, audio/visual and pagers.

WKT-Tact Switches

Other brands


Kingtronics Kt L/T (weeks)

Alps Electric

24~32 weeks

5-8 weeks


12~30 weeks


10~12 weeks


16~18 weeks

TE Connectivity

10~12 weeks

Check out our hot-selling WKT-Tact Switches:




Life cycle

Operating Force

Horizontal with bracket
DIP type





Waterproof Dip type





Dip type with LED









2 Pin Dip type





SMD type surface











50,000 80,000 100,000




50,000 80,000 100,000




50,000 80,000 100,000


1. DC electrolytic capacitors can only be used on DC circuits, and their polarity must be marked in an appropriate position or next to the conductor/terminal.
2. If the polarity of the circuit is unclear or unclear in the circuit loop, it is recommended to use a non-polar electrolytic container.
3. The working environment temperature of electrolytic capacitors should not exceed the specified operating temperature range.
4. Electrolytic capacitors should be stored in low temperature and dry places. If the storage period is long, they should be re aged with rated voltage before using.
5. The ripple current passing through the electrolytic capacitor should not exceed its allowable range. If it exceeds the specified value, electrolytic capacitors with high ripple current resistance should be selected.
6. When in use, the working voltage of the electrolytic capacitor should not exceed its rated voltage.
7. High temperature heating devices such as electric soldering irons should be kept at an appropriate distance from the plastic shell of the electrolytic capacitor to prevent the plastic sleeve from cracking due to overheating.
8. When welding electrolytic capacitors, the welding time and temperature should not exceed 10 seconds and 260 degrees Celsius.
9. Applying excessive force to the guide pins and terminals will damage the internal structure of the electrolytic capacitor

Kingtronics Instructions for using aluminum electrolytic capacitors

In the realm of electronic components, the unassuming Multilayer Ceramic Capacitor (MLCC) has played a pivotal role for decades. As technology continues to advance, so do the applications of these tiny powerhouses. In 2023, Multilayer Ceramic Capacitors have found their way into an astonishing array of cutting-edge technologies, enabling everything from 5G connectivity to space exploration.

1. 5G Revolution
The rollout of 5G networks has brought about unprecedented advancements in communication speed and connectivity. MLCCs, with their high capacitance and compact size, have become essential components in the construction of 5G infrastructure. These capacitors are used in base stations, antennas, and other network equipment to stabilize power distribution and filter out unwanted frequencies, ensuring seamless and reliable connections for users.

2. Electric Vehicles (EVs)
The automotive industry has experienced a paradigm shift towards electric vehicles, and MLCCs have emerged as indispensable elements in this transformation. With their ability to store and discharge energy rapidly, MLCCs are used in EVs for regenerative braking systems, ensuring efficient energy recovery. Additionally, these capacitors help manage power distribution within the vehicle's complex electrical system, contributing to enhanced overall performance and safety.

3. Internet of Things (IoT)
The IoT landscape has grown exponentially, connecting an ever-increasing number of devices. MLCCs facilitate the miniaturization of IoT devices, providing stability to power supplies, filtering out noise, and supporting efficient energy usage. From smart thermostats to wearable health monitors, these capacitors enable devices to communicate seamlessly and process data with precision.

4. Renewable Energy
As the world pivots towards sustainable energy sources, MLCCs have found their way into renewable energy systems. Wind turbines and solar panels rely on sophisticated electronics to capture, store, and distribute energy. MLCCs help stabilize power conversion and conditioning circuits, ensuring a consistent energy flow into the grid.

5. Space Exploration
The realm of space exploration demands components that can withstand extreme conditions while delivering peak performance. Multilayer Ceramic Capacitors have proven their mettle in this arena by being used in satellites, spacecraft, and exploration rovers. Their ability to endure wide temperature ranges, radiation, and mechanical stress makes them vital for critical systems in outer space.

6. Medical Devices
Advancements in medical technology have led to the development of intricate and compact medical devices. MLCCs contribute to the reliability and efficiency of these devices by providing stable power supply filtering and energy storage. From portable diagnostic tools to implantable devices, these capacitors help drive progress in medical science.

Multilayer Ceramic Capacitors have come a long way from their humble beginnings, evolving into indispensable components across various industries in 2023. As technology continues to evolve, the demand for these capacitors is poised to increase further, driving innovations and enabling the seamless functioning of devices that power our modern world. Whether it's high-speed communication, sustainable energy, space exploration, or healthcare advancements, MLCCs are the unsung heroes that make it all possible.

Kingtronics takes pride in presenting premium multilayer ceramic capacitors crafted from high-purity ceramics. Our dedication lies in enhancing our products further through the promotion of miniaturization, increased capacitance, and elevated functionality. The extensive array of items in our collection ensures that you will discover the ideal capacitor for every conceivable application.

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. 

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

Kingtronics Precautions for use of Metal Oxide Varistors

Kingtronics conductive Polymer Aluminum Solid Electrolytic Capacitors, below is our standard product list of Polymer E-cap, welcome share with us your spec request, let us do best to find the product that best meets your specification needs.

Please don’t hesitate to contact us for more information.

kingtronics Polymer Aluminum Solid Electrolytic Capacitors product video:

**Comply with the RoHS directive.
GKT-AS Radial type 105°C
Rated Voltage  2.5V~ 25V, Standard Low ESR

GKT-AR Radial type 105°C
Rated Voltage  2.5V~ 25V, Super Low ESR

GKT-AU Radial type 125°C
Rated Voltage  35V~ 160V, High Ripple Current

GKT-AX Radial type 125°C
Rated Voltage  2.5V~ 25V, High Temperature

GKT-AP SMD type 105°C
Rated Voltage  2.5V~ 100V, Low ESR

low ESR, low impedance, and large permissible ripple current.
stable temperature
excellent performance in terms of blog absorption, smoothness, and transient response.

automotive power, communication power supply,
industrial LED lighting, LCD Monitors
telecom infrastructure.
DC/DC converters and AC/DC converters,
router, TV, voltage regulator,
mobile phone adapter (mobile phone charger), computer motherboard, CPU’s
graphics card

Characteristics & Applications of Kingtronics Polymer Aluminum Solid Electrolytic Capacitors

Kingtronics produce and sell a wide variety of Polymer Aluminum Solid E-cap with Chip SMD type and Radial Lead type.

From the industry trend, we can see the market is also witnessing the development of advanced capacitors, such as polymer capacitors, which offer better performance and longer lifetimes.

-automotive power; industrial LED lighting; telecom infrastructure

If you have any specification requirement please kindly send to us for cross check
Welcome to share your new inquiry with us.
Contact us today for best price quotation---

Polymer Aluminum Solid Electrolytic Capacitors

Kingtronics P/N





Standard Low ESR



Super Low ESR



High Ripple Current



High Temperature




Kingtronics Polymer Aluminum E-cap Series

In the world of electronics, capacitors play a crucial role in energy storage and signal filtering. Among them, Aluminum Electrolytic Capacitors have garnered immense popularity due to their high capacitance, low impedance, and long life characteristics.

Kingtronics has been producing and selling a diverse range of SMD Type Aluminum Electrolytic Capacitors for years and offering exceptional performance and versatility for various applications.

Kingtronics' SMD Type Aluminum Electrolytic Capacitors stand out as a reliable and versatile solution for diverse electronic applications. With their outstanding performance, extended load life, and wide range of capacitance and voltage options, these capacitors have earned a reputation for excellence in the industry. Whether it's powering industrial LED lighting, automotive electronics, or telecom infrastructure, Kingtronics SMD Type Aluminum Electrolytic Capacitors continue to play a vital role in shaping the modern world of electronics.

We welcome you to share your Aluminum Electrolytic Capacitor demands with us. We will do our utmost to provide the best support for your projects.

Kingtronics SMD Type Aluminum Electrolytic Capacitors: Excellence in Performance and Versatility

Electrifying SMD E-Cap Series: Limited-Time Special!

SMD Aluminum Electrolytic Capacitor has always been our best-selling product, and we can offer unbeatable prices and L/T support.

To show appreciation for the continued support from our customers, we are now offering a limited-time promotion for the dimensions listed below in the two series.

If you also have a demand for these, please feel free to share your inquiry with us now! or Skype: kingtronics.sales2

Kingtronics SMD E-Cap Series

Contact us

Tel: (86) 769 8118 8110
Tel: (852) 8106 7033
Fax: (852) 8106 7099
Skype: kingtronics.sales


Kingtronics International Company was established in 1995 located in Dongguan City of China to handle all sales & marketing for factories located in Chengdu, Sichuan and Zhaoqing, Guangdong, China. In 1990, we established the first factory to produce trimming potentiometer and in 1999 we built up new factory in Zhao Qing, Guangdong. Now with around 850 workers, Kingtronics produce trimming potentiometers, dipped tantalum capacitors, multilayer ceramic capacitors, and diode & bridge rectifier. We sell good quality under our brand Kingtronics, and Kt, King, Kingtronics are our three trademarks. All our products are RoHS compliant, and our bridge rectifier have UL approval. Please visit our Products page, you could please download all our PDF datasheet and find cross reference for our Trimming Potentiometer and capacitors.

Tantalum and Ceramic Capacitors Cross Reference ↓ Download
Diodes & Rectifiers List(PDF: 97KB) ↓ Download
Trimming Potentiometer Cross Reference ↓Download



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