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This section provides an overview for resettable fuses as well as their applications and principles. Also, please take a look at the list of 13 resettable fuse manufacturers and their company rankings. Here are the top-ranked resettable fuse companies as of December, 2024: 1.BESTBRIGHT ELECTRONICS CO.,LTD., 2.Bel, 3.Thinking Electronic Industrial Co., Ltd..
Table of Contents
Engaged in research on nitride semiconductor growth using the MBE method at Waseda University Graduate School. After graduating from graduate school in 2016, he joined a non-ferrous metal manufacturer.
Engaged in equipment maintenance and engineering work at metal smelting plants. Moved to a chemical manufacturer in 2022. Engaging in similar tasks.
A resettable fuse is an electronic component that can be used repeatedly while serving as a fuse to prevent overcurrents.
Also called a polyswitch or polyfuse. A PTC thermistor is made of conductive polymer and differs from a fuse in basic principle. A fuse interrupts a circuit by breaking the element due to heating when an overcurrent flows through it.
Resettable fuses, on the other hand, limit the current by increasing the temperature inside the element due to overcurrent, causing the resistance value to increase. Since many products are smaller than fuses, they can be used in smaller spaces, and their structures are resistant to breakage, shock, and vibration.
Resettable fuses are used to protect circuits that are subject to repetitive overcurrents. They are also used for intentional short-circuits in high-density mounting.
The following are examples of applications for resettable fuses:
However, resettable fuses are not suitable for high current circuits because they use electronic components. Fuses with fusing elements are used for current-limiting fuses for high-voltage circuit protection.
Resettable fuses consist of a conductive polymer sandwiched between metal electrode foils. Leads are soldered or welded to connect to the electrode foil, similar to the principle of PTC thermistors, which has a property of increasing resistance with increasing current.
Conductive polymers consist of conductive particles such as carbon and nickel dispersed in an insulating polymer. Resistance can be adjusted by changing the amount and material. Resistance variations can reach 10,000 to 1,000,000 times.
When the internal temperature of a resettable fuse increases due to overcurrent, the resistance value will increase, limiting the current. Unlike fuses, resettable fuses do not blow, and current flow returns to normal when the internal temperature drops. Therefore, they can be used repeatedly.
When the temperature changes at a higher current value, the resistance value increases rapidly. This phenomenon occurs due to the melting of the conductive polymer. However, the reactivity may be low at minute increases in current.
Resettable fuses are selected based on the rated voltage, rated current, and mounting method.
Rated voltage is the height of the voltage at which a resettable fuse will withstand service. If used above the rated voltage, there is a risk of circuit damage or burnout.
Generally, products with a rating of about 72 VDC are widely available. Products with a higher rated voltage, 240 VAC, are also commercially available. Therefore, if a product with a withstand voltage of 400 V system or higher is required, it should be special-ordered.
The rated current is the height of the current that a resettable fuse can withstand for use. When the rated current is exceeded, the resistance value increases, limiting the current value.
Generally, many products are sold in the range of a few amperes. Commercial products are limited to a maximum of about 20A.
The mounting method is to install a resettable fuse. Surface mounting and plug-in terminal mounting products are available.
Surface mounting
Surface mounting is a mounting method in which the fuse is secured to the board with solder, etc., and has the advantage of taking up less space than plug-in terminal mounting. However, many surface mount electronic devices are small, and hand soldering requires proper knowledge and skills.
Some manufacturers do not guarantee the performance of hand soldering in many cases.
Plug-in Terminal Mounting
Plug-in terminal mounting is a mounting method in which leads are plugged into the printed circuit board. The printed circuit board has lead wire mounting holes for easy component mounting, and the lead wires are inserted into these holes for mounting. In addition, it is common to solder the lead wires to the mounting holes to secure the component in place.
Plug-in terminal mounting enables easy mounting of components, but it requires a lot of space. However, if you plan to mount components manually, it is safer to select the plug-in terminal mounting.
*Including some distributors, etc.
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Bel Fuse Inc, established in 1949 in New Jersey, USA, is a manufacturer of connectors, magnetics, circuit protection devices, and aviation power solutions. The company specializes in the manufacturing of patching and magnetic power solutions, alongside integrated connector modules, cable assemblies, aviation parts, and powerlines. These components are used in telecommunications, data centers, aerospace, industrial automation, and automotive industries for their precise data transfer, signal integrity, and protection against electrical interruptions. Their products are also ideal for military, medical, and test & measurement applications offering customized engineering solutions.
Bourns, Inc. is a family-owned company founded in 1947 and currently headquartered in Riverside, California. Bourns is a developer, manufacturer, and supplier of electronic components for several industries including automotive, industrial, instrumentation, medical, consumer, and portable electronics. Bourns operates in 4 market segments: automotive, circuit protection, power conversion, and sensing. The automotive segment produces sensors for almost every use in vehicles including steering, stability, fuel management, and temperature control. Power conversion segment products are used in renewable energy and automotive power. Sensing products are also used in heavy equipment, medical equipment, and welding equipment.
AEM (American Electronic Materials), founded in San Diego, California, and established in 1986, is a developer and manufacturer of SMD components for circuit protection applications. Their products include SolidMatrix Chip Fuse, AirMatrix SMD Wire-In-Air Fuse, CMF High Power Fuse, Thin Film Fuse, and Multilayer Varistors. Their platform is focused on providing solutions for automotive, battery management systems, power tools, IT, and PC. These products help prevent damage to electronic devices and systems by interrupting the flow of electricity in the event of an overload or short circuit, ensuring the safety of electronic systems.
Littelfuse founded in 1927, is an industrial manufacturing company empowering a sustainable, connected, and safer world, headquartered in Chicago, Illinois, United States. The company's product portfolio includes the solutions for both individual and entire systems, as a global manufacturer of technologies in circuit protection, power control, and sensing. Across more than 20 countries, and with approximately 18,000 global associates, partner with customers to design and deliver advanced solutions. Serving over 100,000 end customers, their products are found in industrial, transportation, and electronics end markets.
Bel Fuse Inc. was founded in 1949 and is currently headquartered in Jersey City, New Jersey. The company designs, manufactures and distributes electronics and connectivity devices to global markets including telecommunications, commercial aerospace, transportation, and high-speed data transmission. The company sells products in 16 product segments, including optical connectivity, electrical connectivity, magnetics, power supplies, and others. The company also offers an online resource library for product configuration assistance including technical aspects and drawings, video libraries, and assembly instructions.
Excel Cell Electronic, founded in 1981 is a manufacturer and supplier of electromechanical components and stamping products headquartered in Taiwan. The company offers electromechanical components including industrial control switches, stepping motors, terminal blocks, resettable fuses, and relays. Their stamping products include heat spreaders for BGA, high-precision electronic components, and lead frames of semiconductors for discrete devices / integrated circuit & photoelectric products. The company is ISO/TS 16949:2009, CNS15506: 2011, TOSHMS: 2007, ISO 14001, and ISO 9001-certified, and their products are used in various applications in optoelectronic, security systems, power energy, network, and communication industries.
Thermik Corporation was founded in 1968 in Pforzheim, Germany opened its American subsidiary in 1984 in New Bern, North Carolina. The company is a manufacturer of thermal regulation products used in electronics and appliance manufacturing industries by companies worldwide. The company’s two primary product lines are thermal protectors and thermistors. Thermal protectors limit the maximum temperature reached in devices while thermistors, also referred to as motor protector sensors or PTCs, work by increasing resistance at certain temperatures. They are commonly used in fire detectors, ovens, refrigerators, and in the aviation industry.
The SCHURTER Company was founded in 1933 and operates out of Lucerne, Switzerland. SCHURTER is an innovator and producer of electronic components for many markets including industrial equipment, medical equipment, automotive, avionics and space, data and communication, and energy. SCHURTER products and solutions include: circuit protection, connectors, switches, EMC, custom components, HMI solutions, PCAP touchscreens, resistive touchscreens, capacitive switches, membrane switches, and a series of smart products including Smart Connector DS11 PEM, Smart Connector DT31 external, and Smart Ecosystem.
Thinking Electronic Industrial Co., Ltd., established in 1979 with headquarters in Taiwan, is a manufacturer of circuit protection components for over-voltage protection, over-temperature protection, and over-current protection. The company's product line includes NTC thermistors, ceramic PTC thermistors, polymer PTC resettable fuses, temperature sensors, and gas discharge tubes. Thinking Electronic Industrial Co., Ltd.'s products are used in EV batteries, surge protection devices for 5G mobile infrastructure, kitchen appliances, and photovoltaic systems, among many others. The company also provides custom product design and development services.
BrightKing, founded in 2001 with headquarters in Taiwan and manufacturing facilities in China, is a manufacturer of circuit protection components and a provider of circuit protection solutions. The company's product line includes voltage suppressors, electrostatic dischargers, gas discharge tubes, and other related products used in a wide range of consumer devices, from personal computing to home appliances, home surge protection, and infrastructure projects including mobile base stations. BrightKing also provides consulting and technical support with global distribution, custom manufacturing, sample delivery, prototype testing, and direct shipping.
OptiFuse is an ISO 9001:2015-certified manufacturer of over-voltage and overcurrent protection products established in El Cajon, California, USA, in 2000. The company’s products include various fuses for circuits and devices such as electronic glass and surface mount fuses, as well as fuses for vehicular applications such as bolt-on and automotive blade fuses. It also offers telecom fuses, UL standard fuses, and resettable fuses for heavy duty applications. The company chiefly serves client manufacturers of heavy machinery, recreational vehicles, and consumer electronics.
Fuzetec Technology Co., Ltd., established in New Taipei City, in 1991, is a manufacturer engaged in circuit protection solutions used in electronic and electrical industries. Their product range includes Automotive/EV, Smart Application/IoT, Industrial/Automation, Smart Phone, Energy/Battery and customer made products. They also manufacture Ceramic PTC, Bimetal fuse and Current Control IC that are used for wide range voltage DC and AC application. The company has distributors and customer service all around the world.
NIDEC COPAL ELECTRONICS was established in Japan in April, 1967 as a specialty manufacturer of electronic components. NIDEC’s offerings have increased to serve the automotive, construction, medical equipment, FA equipment, analytical measuring equipment, and residential security industries. Among the offerings are components for LiDAR, railway pressure sensors, CPAP, dialysis, MRI, and ultrasonography machines, wireless base stations, and power tools. These components include switches, sensors, mirrors, motors, and fans.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | BESTBRIGHT ELECTRONICS CO.,LTD. |
13.2%
|
| 2 | Bel |
13.0%
|
| 3 | Thinking Electronic Industrial Co., Ltd. |
13.0%
|
| 4 | AEM Components, Inc. |
12.9%
|
| 5 | ECE |
10.3%
|
| 6 | Bel Fuse, Inc. |
9.6%
|
| 7 | OptiFuse |
8.7%
|
| 8 | SCHURTER |
8.6%
|
| 9 | Bourns, Inc |
8.1%
|
| 10 | Thermik Gerätebau GmbH |
0.9%
|
Derivation Method
The ranking is calculated based on the click share within the resettable fuse page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
5 | 41.7% |
|
Taiwan
|
3 | 25.0% |
|
Germany
|
1 | 8.3% |
|
Switzerland
|
1 | 8.3% |
|
China
|
1 | 8.3% |
|
Japan
|
1 | 8.3% |
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