Allen-Bradley
Allen-Bradley is Rockwell Automation’s industrial automation brand, covering controllers, drives, interfaces, safety equipment, software, and related factory-control systems.
Last updated August 21, 2026
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Overview
Allen-Bradley is an American industrial automation brand owned by Rockwell Automation. Its products are used to control, monitor, connect, protect, and optimize machinery, production lines, and industrial processes. The brand is particularly associated with programmable logic controllers, industrial control platforms, motor and motion products, operator interfaces, industrial networking, sensors, safety equipment, and automation software. The business developed from electrical-control work undertaken by Stanton Allen and Lynde Bradley in Milwaukee. Their early inventions included carbon-based rheostats and a current-controlled motor controller intended for industrial cranes. The company began operating in 1903 as the Compression Rheostat Launch Company and used the Allen-Bradley name commercially from 1904. Harry Bradley joined his brother Lynde in the business in 1904, and the company adopted Allen-Bradley Company as its formal name in 1910. During its early decades, Allen-Bradley supplied industrial electrical equipment such as starters, switches, circuit breakers, relays, and rheostats. It also benefited from the growth of radio manufacturing, with its Bradleystat miniature rheostat becoming a significant product during the 1920s. The company expanded its Milwaukee manufacturing facilities and developed a large industrial presence in Wisconsin. Wartime production during the First and Second World Wars broadened its capabilities and made industrial controls and electrical components important parts of its business. Allen-Bradley became increasingly identified with automation as manufacturing shifted from electromechanical control toward programmable electronic systems. In 1970 it introduced the 1774 programmable controller, commonly known as the PLC-1, and helped establish the term programmable logic controller in industrial usage. Subsequent PLC families included PLC-2, PLC-3, PLC-5, SLC 500, MicroLogix, ControlLogix, CompactLogix, and Micro800. The brand also developed Data Highway, an early industrial network designed for digital control systems. Rockwell International acquired Allen-Bradley in 1985 for approximately $1.651 billion, a figure reported in historical accounts of the transaction. Allen-Bradley thereafter operated as a principal industrial-automation brand within Rockwell’s portfolio. Following Rockwell International’s later corporate evolution into Rockwell Automation, the brand continued to identify a broad range of automation hardware and software, while Rockwell Automation provided the corporate organization, engineering ecosystem, services, and distribution structure. Today, Allen-Bradley products serve discrete manufacturing, process industries, material handling, energy and infrastructure, food and beverage, automotive, life sciences, and other industrial applications. The brand’s positioning is primarily business-to-business: it sells through industrial distributors, integrators, original-equipment manufacturers, engineering organizations, and direct enterprise relationships rather than as a consumer brand. Its portfolio is commonly deployed as part of integrated control architectures that combine controllers, I/O, drives, motion systems, visualization, networking, safety, and software. Rockwell Automation also provides related repair, consulting, lifecycle, and asset-management services. The Allen-Bradley Clock Tower in Milwaukee remains a prominent landmark associated with the company’s historical identity.
History
Allen-Bradley traces its origins to electrical-control experiments by Lynde Bradley and Stanton Allen. In 1893, Bradley built an early carbon-pile rheostat for a toy lathe. In 1901, Allen and Bradley developed a carbon-disc motor controller for industrial cranes, completing the device on August 18 of that year. The controller was soon adopted by Milwaukee Electric Company. The enterprise began in 1903 as the Compression Rheostat Launch Company in the Pfeiffer & Smith Machine Shop. An agreement with American Fuse Company provided an initial commercial route, while the Allen-Bradley name was used in marketing from 1904. Harry Bradley joined the company that year, and the crane controller was demonstrated at the St. Louis World’s Fair. After disputes involving the use of names and patents, the business was renamed Allen-Bradley Company in 1910. It acquired the Pfeiffer & Smith Machine Shop in 1916 and expanded its Milwaukee facilities. World War I increased demand for starters, switches, circuit breakers, relays, and other electrical equipment. During the 1920s, the company also became an important supplier to the radio industry through miniature rheostats, especially the Bradleystat introduced in 1922. The company introduced its octagonal logo in 1923 and developed other components, including a sewing-machine foot pedal. Sales reached a reported $3 million in 1929. The Great Depression caused severe losses, workforce reductions, and wage cuts. Lynde Bradley nevertheless emphasized research and development as a way to build new markets. By 1937 employment had returned to its earlier level and sales had reached a reported high of nearly $4 million. The company introduced a single-moving-part solenoid starter in 1934 and a hot-molded fixed resistor in 1935. Lynde Bradley died in 1942, after which Harry Bradley led the company. Second World War contracts transformed the scale of production. About 80 percent of orders were described as war-related, consisting mainly of industrial controls used to increase production and electrical or radio components used in military equipment. Allen-Bradley expanded its facilities and added employee services, including medical and recreational facilities. A major postwar expansion began in 1947 under president Fred Loock and chairman Harry Bradley. The company continued to enlarge its Milwaukee operations through the 1950s and 1960s, while opening a Canadian subsidiary in Galt, Ontario, in 1952 and its first factory outside the United States in the United Kingdom in 1969. The company diversified during the postwar period. It supplied ferrite magnets, acquired Rostone Corporation in 1964, and marketed TEGA tiles through a Canadian operation connected with that acquisition. Its visual identity also changed, including a logo redesign by Brooks Stevens in 1957. Products such as Series K across-the-line starters reflected its continuing role in industrial motor control. Allen-Bradley’s most consequential transition was into programmable automation. In 1970 it introduced the 1774 programmable controller, identified with the PLC-1 generation. It later developed PLC-2, PLC-3, and PLC-5 families, as well as Data Highway, an industrial communications system introduced in 1979. These products helped establish the company as a major supplier of programmable control rather than only conventional electrical components. Later milestones included PLC-5 and RSLogix5, SLC 500 in 1991, MicroLogix in 1994, ControlLogix and RSLogix 5000 in 1997, CompactLogix in 2006, and Micro800 in 2011. In 1985 Rockwell International acquired Allen-Bradley for approximately $1.651 billion. The transaction was described at the time as the largest acquisition in Wisconsin history. Allen-Bradley’s industrial automation activities became central to Rockwell’s control business, while the brand name remained visible on products and technical platforms. Rockwell International later became Rockwell Automation, and Allen-Bradley continued as its principal product brand for industrial control and automation. The company’s history also includes political and labor controversies. Historical accounts describe mid-century conservative political activity connected with members of the Bradley family and company-funded anticommunist propaganda. In 1968, a protest involving the NAACP and Milwaukee’s Latino community challenged alleged discriminatory hiring practices and became associated with the emergence of Latino activism in the city. These matters belong to the history of the former company and its owners; they should not be treated as evidence of current Rockwell Automation conduct without separate contemporary documentation.
- 2011
Micro800 launched
[1]Rockwell Automation introduced the Micro800 family under the Allen-Bradley brand.
- 1997
ControlLogix launched
[1]The ControlLogix platform and RSLogix 5000 programming environment were introduced.
- 1991
SLC 500 introduced
[1]Allen-Bradley launched the SLC 500 programmable-controller family.
- 1985
Acquired by Rockwell International
[1]Rockwell International acquired Allen-Bradley for approximately $1.651 billion.
- 1979
Data Highway introduced
[1]The brand introduced Data Highway, an industrial network designed for digital control systems.
- 1970
Programmable controller launched
[1]Allen-Bradley introduced the 1774 programmable controller, associated with the PLC-1 generation.
- 1922
Bradleystat introduced
[1]The Bradleystat miniature rheostat became an important component in the expanding radio industry.
- 1910
Renamed Allen-Bradley Company
[1]The company adopted the Allen-Bradley Company name.
- 1904
Allen-Bradley name marketed
[1]Harry Bradley joined the business, and the crane controller was demonstrated at the St. Louis World’s Fair under the Allen-Bradley name.
- 1903
Business founded
[1]The enterprise began as the Compression Rheostat Launch Company in Milwaukee.
Products and positioning
A premium industrial automation and control platform brand for manufacturers, process operators, machine builders, and systems integrators.
Industrial control · 1970
Programmable logic controllers
Allen-Bradley programmable logic controllers coordinate machine sequences, production-line logic, motion, safety functions, and process operations. The family history includes PLC-1, PLC-2, PLC-3, PLC-5, SLC 500, MicroLogix, ControlLogix, CompactLogix, and Micro800 platforms, serving applications from compact machines to integrated plant architectures.
Industrial control platform · 1997
ControlLogix
ControlLogix is a modular, high-performance controller platform used in larger machine, manufacturing, process, and plantwide automation systems. It is designed to integrate control, I/O, motion, communications, and software within a common Logix architecture.
Industrial control platform · 2006
CompactLogix
CompactLogix provides Logix-family programmable control in a more compact form factor for mid-range machines and production systems. It is commonly combined with distributed I/O, drives, motion products, industrial networks, and visualization.
Motor and motion control
Industrial drives
Allen-Bradley drives regulate motor speed, torque, acceleration, and braking in equipment such as conveyors, pumps, fans, hoists, and machine tools. The portfolio includes variable-frequency drives and products integrated with broader motor-control and automation architectures.
Operator interface
PanelView human-machine interfaces
PanelView interfaces allow operators to view machine status, adjust parameters, acknowledge alarms, and control industrial equipment. They are designed to work with Allen-Bradley controllers and Rockwell Automation visualization software.
Machine safety
Industrial safety products
Safety products support emergency stopping, guarding, interlocking, presence detection, safety monitoring, and related risk-reduction functions on machinery and production lines.
Industrial software
FactoryTalk software
FactoryTalk is Rockwell Automation’s software family associated with supervisory control, visualization, information management, design, analytics, and production operations. It complements Allen-Bradley control hardware in integrated automation systems.
Controversies
1968
Protest over alleged discriminatory hiring practices
The NAACP and Milwaukee’s Latino community participated in a march protesting alleged discriminatory hiring practices at Allen-Bradley. The event is also identified in historical accounts as an early milestone in Milwaukee Latino activism.
Mid-century political propaganda controversy
Historical accounts describe company-funded anticommunist propaganda and political activity associated with the Bradley family during the mid-twentieth century. The material included alarmist messages about communism and government policy. The account concerns the former company and family network, and does not establish current-brand conduct.
Brand decisions
1985
Sale to Rockwell InternationalM&ABackground
Allen-Bradley had become a substantial industrial-control company with a strong automation portfolio.
Action taken
Rockwell International acquired the company for approximately $1.651 billion.
Aftermath
Allen-Bradley became a core industrial automation brand within Rockwell and later Rockwell Automation.
Acquisition price. Approximately US$1.651 billion (1985)
1970
Enter programmable logic controlProduct launchBackground
Industrial customers were moving from fixed electromechanical control toward flexible electronic automation.
Action taken
Allen-Bradley launched the 1774 programmable controller, associated with its PLC-1 generation.
Aftermath
The launch became the foundation for later PLC, Logix, networking, and software families.
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