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This section provides an overview for breakers as well as their applications and principles. Also, please take a look at the list of 12 breaker manufacturers and their company rankings. Here are the top-ranked breaker companies as of December, 2024: 1.CZ Electric Co., Ltd., 2.GEYA, 3.Taixi Electric Co., Ltd.
Table of Contents
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A Breaker is a safety device that protects electric circuits by shutting off the power supply in the event of an abnormal current flow.
It automatically shuts off the power supply when a circuit has a ground fault or when a current exceeding the specified value flows.
When a current exceeding the allowable level flows through a cable, the cable itself gradually heats up. If the current continues to flow for a long period of time, the cable sheath and surrounding combustible materials may ignite due to the heat, resulting in a fire or other danger. Also, in the event of a ground fault in the circuit, electricity will flow through the steel frame of the building to combustible materials, posing a high risk of fire.
To prevent such electrical fires and electric shock injuries to people, a breaker is used to shut off the power supply in the event of a ground fault or overcurrent.
A breaker is a circuit breaker. In general, however, a low-voltage device is called a breaker, while a high-voltage or higher protective device is called a circuit breaker.
Vacuum circuit breakers and oil circuit breakers are used for high voltage.
Breakers are indispensable devices in the use of electricity and are widely used in general and industrial applications. In most cases, breakers are installed on the power supply side of equipment that handles electricity.
The following are examples of where breakers are used:
A distribution board for a house is generally used for breakers, which are installed to prevent house fires and electric shocks to residents. Breakers are also used in pumps that handle water. Submersible pumps, for example, throw their motors into the water, so there is a high risk of electrical leakage, and RCDs are generally used.
They are also used in the power circuits of commercial air conditioners used in commercial facilities. Since air conditioners are prone to ground faults due to the accumulation of condensate inside, and since passersby may also touch them, the use of RCDs is recommended.
A breaker consists of wiring terminals, disconnecting device, casing, etc.
Wiring terminals are metal fittings used to connect wires to the Breaker. The push-in type, in which a ferrule terminal or the like is inserted, is often used.
A pull-out device is a mechanism that interrupts the circuit in the event of an overcurrent, and is available in thermally-actuated and electromagnetic types. The thermodynamic type uses a bimetal to detect overheating due to overcurrent, while the electromagnetic type detects overcurrents by electromagnetic force due to electric current. There are also products that combine both.
A casing is a component that insulates conductive parts from the outside. The casing insulates the circuit breaker from electric shock even if a person touches it, and is generally made of hard plastic or other materials.
There are many types of breakers, which can be classified according to their mounting method and short-circuit interrupting capacity.
Breakers can be mounted either on the front side or on the back side.
Surface type
This method is mainly used for control panels and distribution boards.
Back-surface type
This type is installed and wired on the back side of the metal panel and is sometimes used for cubicles, etc.
There are two types of short-circuit interrupting capacity: economic type and general-purpose type, which are selected according to the short-circuit capacity of the upper system.
Economical type
Low cost, but small short-circuit interrupting capacity.
General-purpose type
More expensive than the economical type, but has the advantage of large short-circuit interrupting capacity.
Functions can be classified into two major types: wiring circuit breakers and ground-fault circuit breakers.
Wiring Circuit Breakers
Wiring circuit breakers protect circuits by shutting off electricity when a certain amount of current flows through a circuit. There are two types of overcurrents: short circuits caused by malfunctions and overloads caused by excessive use of electricity.
If an overcurrent condition persists, the cables may overheat, resulting in fire or ignition. Wiring circuit breakers cut off the power supply before a fire or other danger occurs.
Leakage Circuit Breakers
Also called ELB (Earth Leakage Circuit Breaker), an electrical device that interrupts a circuit when it detects a leakage to prevent accidents and disasters. When the insulation performance of electric cables and electrical equipment deteriorates, electric leakage may occur.
In addition, there is a high risk of electric shock if the equipment comes into contact with the outer box of the electrical equipment in a leakage condition, and a high risk of fire if the equipment leaks through the steel frame of a building. RCDs can prevent these hazards.
*Including some distributors, etc.
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Terasaki Electric Co., Ltd., established in 1923, and headquartered in Osaka, Japan, is a manufacturer and a supplier of motor control systems, circuit breakers, and electronic devices. The company offers a diverse range of products such as marine systems like power distribution systems, control and monitoring systems, and more. It also provides circuit breakers including molded case and air circuit breakers, as well as medical devices and engineering & lifecycle services. The company adheres to ISO13485 certification for medical devices and complies with other industry standards such as JIS and IEC for its products.
CZ Electric Co., Ltd. was founded in 1990 and is headquartered in Jiaxing City, Zhejiang Province, China, as a manufacturer and producer of explosion-proof electrical products. The company's product range comprises 3ENG explosion-proof flexible conduits, BGJ explosion-proof pipe connectors, and CKX explosion-proof instrument box modules, among others. It also provides services such as craft-sheet metal bending, technology-robot stainless steel welding, and craft-laser engraving. The products and services ensure safety in hazardous environments and support precision fabrication and customization in various industries. The company caters to various industries, including oil and gas, petrochemicals, chemical processing, manufacturing, and industrial automation.
WenZhou Hawai Electron & Electric Manufacture Co. Ltd., founded in 1989, is a manufacturer of waterproof, smart electrical products for medium- and high-voltage power applications based in Zhejiang, China. The company produces circuit breakers, power stations, and surge protection devices for the power generation, transportation, and storage industries. The company has earned ISO 9001:2008, SEMKO, ISO 14000, SAA, and CB certifications, and also provides certifications for testing, factory inspection, research tests, and bidding qualifications.
Geya is an electrical equipment manufacturer established in China in 2007. It produces electrical control devices, low voltage protection devices, solar energy equipment, and circuit breaker SKDs in compliance with CE, UL, and other international certification standards. The company's ISO 9001-certified factory has a production capacity of over 100,000 parts per month, it offers OEM and ODM services for the development of custom solutions, and it exports to over 30 countries.
Amprobe Instrument Corporation, began life in Long Island, NY in 1948 under the name Pyramid Instrument Company, later renamed in1960, is a manufacturer and builds rugged test and measurement tools. The company was acquired by the Danaher Corporation and moved its worldwide headquarters to Everett, Washington in 2006. It designs, manufactures and distributes products from an extensive line of clamp meters and digital multimeters to industry-specific tools for residential/commercial electricians, HVAC/R technicians, utilities and industrial maintenance professionals. Its tools undergo rigorous and intensive testing to ensure compliance with the latest regulations in Fluke's CSA-recognized lab for safety and accuracy.
Yueqing Feeo Electric Co., Ltd., established in 2000, is a manufacturer of photovoltaic products in Yueqing, Zhejiang, China. The products produced by the company include circuit breakers, combiner boxes, automatic transfer switches, solar connectors, and AC series isolators. It also produces solar tools, DC isolators, waterproof enclosure boxes, DC fuses, and DC breakers for control circuits, power production, and transportation applications. The company provides a product warranty and has earned CE and TUV certifications.
Yueqing Yro Electric Co., Ltd., established in 2009, is a manufacturer and supplier of protective components for photovoltaic systems in Yueqing City, Wenzhou City, Zhejiang Province. The company supplies components such as solar power optimizers, surge protective devices, solar panels, rapid shutdown devices, and dual power transfer switches. It also produces PV combiner boxes, circuit breakers, isolator switches, voltage protectors and fuses used in electrical and power generation industries. The company has UKCA, RoHS, ISO 9001, CE, and TUV certifications.
JIANGSU AISIKAI ELECTRIC CO., LTD. is a researcher and manufacturer of electrical switches in Yizheng City, Jiangsu Province, China, founded in 2007. The company produces automatic transfer or load isolation switches, intelligent controllers, under-voltage protectors, battery chargers, and circuit breakers for high-voltage, universal, miniature, and molded cases used in smart electric appliances. The company has obtained IKAS ISO 9001 quality management system certification and SGS Global Qualified Supplier Authentication, and all products have Chinese Compulsory Certification (CCC) and European Certification (CE).
Taixi Electric Co., Ltd., founded in 1996, is a manufacturer and supplier of low-voltage electric components in Yueqing City, Zhejiang Province, China. The company’s product categories include circuit breakers, distribution electricals, control equipment, and energy electronics, including active filters, transformers, voltage regulators, power supplies, and voltage stabilizers used in hydropower, thermal power, and transportation sectors. The company passed the international ISO 9001 quality system certification, and dome products have passed the national CCC certification.
Fuji Electric Equipment Control was established in 2008 in Saitama-ken, Japan is a manufacturer of power distribution and control equipment. The company boasts an extensive and diversified product portfolio including motor controls, MV distributors, energy control equipment, LV distributors, and industrial control relays. These products find applications in construction as magnetic contactors, automotive as manual motor starters, home appliances as air circuit breakers, health care devices as sensors and switches, and in environmental management for quality assurance and protection of high-voltage electric power and management of low-voltage consumption rate.
Nader founded in1999, is a manufacturer and supplier of miniature circuit breakers in Shanghai, China. The company produces miniature circuit breakers, contractors, molded case circuit breakers, and accessories such as alarm contacts, shunt trippers, reclosing controls, under voltage trippers, and remote controls used in construction, telecommunication, electronics, electrical, and industrial industries. The company is certified by CE, RoHS, CCC, UL, and TUV. The company facility is an International Test Center and has earned the strategy cooperation of the CNAS, CQC, and US UL organizations.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | CZ Electric Co., Ltd. |
19.6%
|
| 2 | GEYA |
14.3%
|
| 3 | Taixi Electric Co., Ltd |
12.5%
|
| 4 | Yueqing Yro Electric Co.,Ltd |
8.9%
|
| 5 | Yueqing Feeo Electric Co.,Ltd. |
8.9%
|
| 6 | TERASAKI ELECTRIC CO.,LTD. |
8.9%
|
| 7 | Nader |
7.1%
|
| 8 | WenZhou Hawai Electron & Electric Manufacture Co., Ltd. |
7.1%
|
| 9 | JIANGSU AISIKAI ELECTRIC CO.,LTD. |
5.4%
|
| 10 | Amprobe Instrument Corporation |
3.6%
|
Derivation Method
The ranking is calculated based on the click share within the breaker 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.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
China
|
6 | 75.0% |
|
Japan
|
2 | 25.0% |
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