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This section provides an overview for disconnect terminal blocks as well as their applications and principles. Also, please take a look at the list of 10 disconnect terminal block manufacturers and their company rankings. Here are the top-ranked disconnect terminal block companies as of March, 2025: 1.Graybar Electric Company, Inc., 2.Wonke Electric Co., Ltd, 3.Weidmüller Interface GmbH & Co. KG.
Table of Contents
A disconnect terminal block is a terminal block that, in addition to the function of electrically connecting cables to which terminals are crimped, as with a normal terminal block, has a disconnect function. Therefore, it can be easily disconnected electrically by simply pulling on the mechanism by hand, without removing the terminals.
Since there is no need to loosen screws when disconnecting, there is no need to touch the charging section even when power is being supplied, eliminating the risk of electric shock. The terminals are connected to the terminal block with screws.
Disconnect terminal blocks are mainly used in control panels and relay panels. Most of them are used in the low voltage range of 24 V to 220 V.
They are used specifically because they are built into the power supply to sensors and instrumentation, and can be easily turned off by disconnection terminal operation when a sensor is out of service due to a failure of the relevant sensor, etc.
Also, when repairing a sensor, simply disconnecting the disconnecting terminal is all that is required, so there is no need to open the upper MCB and the sensor can be repaired individually.
In a basic terminal block, a cable with terminals crimped to each of the terminal blocks facing each other is attached with screws, allowing current to flow through conductors such as copper inside and electrically connecting the two cables.
The disconnect terminal block also has a conductor attached to the disconnect mechanism, and when energized, the two cables are connected through the conductor of the disconnect section. When disconnecting the power, the disconnecting section is pulled, and the intermediate conductor connecting each terminal section is removed, thus disconnecting the power line (basically, the disconnection operation is performed when there is no voltage).
This method is not suitable for use in areas where voltage is high, as arcing may occur when disconnecting from the energized state, resulting in electric shock or burn damage.
Terminal blocks are also equipped with insulators called separators to prevent short circuits by insulating adjacent terminals so that current does not flow between them. Separators can also burn out and cause dielectric breakdown if used in high-voltage circuits.
*Including some distributors, etc.
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Graybar Electric Company, Inc. is a distributor of electrical, communications, and data networking and solutions. The company was founded in 1869 and is headquartered in New York City. Graybar's main activity is the distribution of electrical and communications products, including wire, cable, switches, and lighting. The company also offers a wide range of services, including engineering, installation, and maintenance. Graybar's products are used by a wide range of customers, including contractors, engineers, and manufacturers. It has over 10,000 employees and operates in more than 50 countries.
Toyogiken Co. Ltd (TOGI) is a manufacturer in electrical machinery and accessories. They design, develop and sell terminal blocks, transformers, cables, box terminals, PC board terminals and related accessories. TOGI headquartered in Nagano, Japan has set up their global operations in China, Taiwan, Korea, Thailand, Indonesia, Malaysia and Vietnam. The company is ISO:9001 2015 certified. In addition they are also involved in solar power business operations. TOGI holds 7 patents, 5 trademark patents and 48 utility model patents.
Fuji Electric Industry Co., Ltd. is a manufacturer of electrical products such as control switches, connecting devices, pilot lamps and indicators, and electronic devices founded in February 1953, in the town of Nijo, Nakagyo-ku, Kyoto, Japan. In 70 years, the company has three sales offices with Kyoto as its headquarters. Other sales office are in Tokyo and Shiga. It currently has three factory offices located in Shiga, Japan. The company released its first product in 1959-a multi-window indicator. Since 1953, the company released 26 more products. Aside from manufacturing electrical products, the company offers scholarships for students which they started in 1976.
Wonke Electric Co., Ltd, established in 1999, is an electrical engineering manufacturer based in China specializing in manufacturing terminal blocks and air fan filters. The company offers a range of products, including terminal blocks, air fan filters and heavy-duty connectors, among others. Their products are mainly used in electronic equipment, machine building, plant engineering, and the process industry. Wonke Electric aims to help plants meet high standards of safety, quality, and performance through their products and services. The company’s research and development team enables them to provide customized solutions that cater to different customer requirements.
SEIKO ELECTRIC CO.,LTD., founded in 1921 and headquartered in Fukuoka, Japan, is a manufacturer specializing in electrical and control systems. It offers environmental energy and control systems, including solar power and battery energy storage systems, and information and control systems like factory and building automation. These products find applications across various sectors, spanning utilities, manufacturing, transportation, and commercial buildings. The company's diverse range is designed to facilitate electrical power generation, transmission, distribution, control, and energy management, ultimately enhancing efficiency and reducing energy consumption in these industries.
Phoenix Contact is headquartered in Blomberg, Germany, originally founded in 1923. Phoenix Contact’s Israeli subsidiary was founded in 2006 and located in Quadima Tzoran. Phoenix Contact provides tools and components for e-mobility, power, infrastructure, process industry, production manufacturing, system manufacturing, and others. Phoenix Contact’s product lines include automate including cloud computing, connect including PCB terminal blocks, “mark, assemble, and install” including hand tools, “supply, charge, and protect” including power distributors, and “switch, measure, and monitor” including relays and optocouplers.
Weidmüller Interface GmbH & Co. KG, established in 1850 and headquartered in Detmold, Germany, is a supplier of electronic equipment for electrical connectivity. The company's product range spans terminal blocks, connectors, relay modules, and power supplies. The company also offers automation and industrial PC software, accessories, and assemblies. It provides solutions in various fields such as decentralized automation, E-mobility, photovoltaics, single-pair Ethernet, and smart metering. The company holds DIN EN ISO 9001 accreditation for quality assurance management and offers various services such as customized products, support, digital ordering options, consulting, and engineering.
Ranking as of March 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Graybar Electric Company, Inc. |
31.3%
|
| 2 | Wonke Electric Co., Ltd |
18.8%
|
| 3 | Weidmüller Interface GmbH & Co. KG |
12.5%
|
| 4 | TOYOGIKEN CO.,LTD. |
12.5%
|
| 5 | FUJI ELECTRIC INDUSTRY CO., LTD. |
12.5%
|
| 6 | NINGBO XINLAIYA ELECTRONIC TECHNOLOGY.CO., LTD. |
6.3%
|
| 7 | PHOENIX CONTACT |
6.3%
|
Derivation Method
The ranking is calculated based on the click share within the disconnect terminal block page as of March 2025. 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 (%) |
|---|---|---|
|
Japan
|
4 | 44.4% |
|
China
|
2 | 22.2% |
|
Germany
|
2 | 22.2% |
|
United States of America
|
1 | 11.1% |
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