The U.S. relay industry in 2025 is evolving rapidly, driven by smart electronics, automation, and renewable energy. Choosing the right manufacturer now requires a focus on innovation, reliability, and adaptability.
With numerous suppliers on the market, it’s essential to know which companies consistently deliver high-quality, durable relays. This guide spotlights the top 6 U.S. relay manufacturers leading in design, efficiency, and technological advancement.
List of the Six Relay Manufacturers in USA
| No. | Company | Founded | Headquarters | Main Products |
|---|---|---|---|---|
| a1 | Sensata | Crydom | 1916 | Attleboro, MA | Panel-mount SSR; DIN-rail SSR; Plug-in SSR |
| a2 | Rockwell Automation | Allen-Bradley | 1903 | Milwaukee, WI | General-purpose; Interface; Timing; Solid-state; Control Relays |
| a3 | CDGKZ | 1998 | Houston, TX | Electromechanical; Power; DIN-rail; Timing; Safety Relays |
| a4 | Struthers-Dunn | 1923 | North Charleston, SC | Power; Timing; Latching; Stepping; Voltage Relays |
| a5 | SEL | 1982 | Pullman, WA | Feeder Protection; Motor Protection Relays |
| a6 | Eaton | 1911 | Dublin, Ireland / Cleveland, OH | Terminal Block; Contactor; Monitoring; Timing; Safety Relays |
1.Sensata | CrydomÂ
Founded & Headquarters
Founded: 1916
Headquarters: Attleboro, Massachusetts, USA
Company Overview
Sensata Technologies is a century-old leader in sensing and electrical control solutions, serving industries such as automotive, industrial machinery, aerospace, and energy management. As one of the most representative industrial technology companies in the United States, it has built global trust through reliability and innovation. By strategic acquisitions, Sensata has expanded into relay and switching technologies, supporting industrial automation and energy efficiency.
In the relay field, Sensata’s Crydom brand specializes in solid state relays (SSR), known for long lifespan, contactless operation, and resistance to vibration. For applications that require frequent switching and high reliability—such as heating, lighting, and power switching—Crydom relays minimize downtime and maintenance costs. Users rely on their stable performance to ensure production continuity and equipment safety.
Main Relay Products
Panel-mount SSR (CW Series)
DIN-rail SSR (Nova22 DR22 Series)
Plug-in SSR (ED Series)
2.Rockwell Automation | Allen-BradleyÂ
Founded & Headquarters
Founded: 1903
Headquarters: Milwaukee, Wisconsin, USA
Company Overview
Rockwell Automation is a global leader in industrial automation and smart manufacturing, with operations in more than 100 countries. Its Allen-Bradley brand has long provided electrical control and information solutions for manufacturing, power, building automation, and infrastructure. Allen-Bradley relay products are widely used in control systems and electrical panels, recognized as reliable choices across industries.
Its portfolio includes general-purpose, interface, timing, and solid-state control relays, designed for seamless integration with PLCs and control systems. For users, these relays offer flexible wiring, multi-voltage compatibility, and space-saving high-density designs. Customers benefit from simplified system architecture and easier maintenance, balancing reliability with scalability.
Main Relay Products
General-purpose slim relays (700-HK)
Interface/terminal block relays (700-HL)
High-performance timing relays (700-FS)
Solid-state timing relays (700-RTC)
Control relays (700-EF)
3.CDGKZÂ
Founded & Headquarters
Founded: 1998
Headquarters: Houston, Texas, USA
Company Overview
CDGKZ is a professional relay manufacturer dedicated to industrial control, power distribution, and automation applications. Since its founding, the company has developed a strong reputation in North America by providing reliable, high-quality relays tailored to the practical needs of customers. With continuous investment in research, testing, and innovation, CDGKZ emphasizes product safety, long-term durability, and compliance with international certification standards. Its relays are widely applied in industries such as energy, manufacturing, transportation, and building automation.
For users, CDGKZ products are designed to operate stably even under harsh conditions, while offering simplified installation and maintenance. The company focuses on improving equipment uptime, reducing operational complexity, and supporting engineers and integrators with flexible solutions. This user-centered approach ensures that clients gain both cost efficiency and dependable system performance.
Main Relay Products
General-purpose Electromechanical Relays
Power Relays for Industrial Equipment
DIN-rail Mounted Interface Relays
Timing Relays for Automation Systems
Safety Relays for Industrial Protection
4.EatonÂ
Founded & Headquarters
Founded: 1911
Headquarters: Dublin, Ireland (U.S. operations center in Cleveland, Ohio)
Company Overview
Eaton is a global power management company with strong influence in energy efficiency and electrical control. It provides solutions for power distribution, industrial control, lighting, and emergency power systems. Eaton serves data centers, factories, commercial buildings, and transportation, supported by a wide distribution network and engineering services.
In the relay segment, Eaton offers a comprehensive product line including terminal block relays, contactor relays, monitoring and timing relays, as well as safety relays compliant with international standards. Known for robust design and modularity, Eaton relays adapt to diverse industrial environments. For users, Eaton products improve system stability, simplify integration, and reduce long-term operational costs.
Main Relay Products
XR Terminal Block Relays
DILA Contactor Relays
D65 Monitoring Relays
TMRP/ETR Timing Relays
ESR5 Safety Relays
5. Struthers-DunnÂ
Founded & Headquarters
Founded: 1923
Headquarters: North Charleston, South Carolina, USA
Company Overview
Struthers-Dunn is one of the earliest U.S. companies dedicated to relay manufacturing, with nearly a century of expertise. Originally serving traffic signals and power systems, it expanded into defense, aerospace, and nuclear industries, where high-reliability components are critical. With strict manufacturing processes and traceability, Struthers-Dunn is recognized for durability and stability.
Its product range includes power relays, timing relays, latching relays, and voltage sensing relays, designed to operate reliably under extreme temperature, vibration, and harsh electrical conditions. For customers in high-risk industries, choosing Struthers-Dunn ensures long-term performance and compliance with stringent standards.
Main Relay Products
219 Series Power Relays
236/237 Timing Relays
255 Latching Relays
311 Stepping Relays
349 Voltage Sensors
6.SELÂ
Founded & Headquarters
Founded: 1982
Headquarters: Pullman, Washington, USA
Company Overview
Schweitzer Engineering Laboratories (SEL) is a recognized innovator in power system protection and automation, credited with developing the world’s first digital protection relay. The company insists on U.S.-based manufacturing and serves utilities, industrial plants, and data centers worldwide. SEL products are widely regarded as the standard for power system safety and reliability.
In relays, SEL focuses on digital protection relays covering feeder, motor, and bus applications. These devices integrate overcurrent protection, arc-flash detection, event recording, and communication features. For users seeking high reliability and intelligent power management, SEL relays provide comprehensive solutions that improve fault response and system stability.
Main Relay Products
SEL-351 Feeder Protection Relay
SEL-751 Feeder Protection Relay
SEL-710 Motor Protection Relay
Key Innovations That Shaped the Relay Industry in the United States
The U.S. relay industry has evolved from basic electromechanical components to smart, durable, and highly integrated solutions. Innovations in performance, reliability, and energy efficiency are driving modern industrial applications. Here are the key breakthroughs shaping the market today:
1. From Classic to Smart: How Relay Technology Evolved
Explore the journey from traditional electromechanical relays to cutting-edge smart relays. U.S. manufacturers have improved performance, reduced size, and added advanced features to power industries from automotive to automation.
2. Reliability Meets Industrial Power: Innovations That Last
Breakthroughs in materials, contact design, and industrial integration have enhanced durability, safety, and efficiency. Modern relays seamlessly connect with PLCs and IoT systems, minimizing downtime and maximizing productivity.
3. Energy-Smart Relays and Future-Ready Applications
Low-power, eco-friendly designs and predictive maintenance are shaping next-generation relay applications. From renewable energy systems to advanced industrial automation, these innovations are defining the future of the U.S. relay industry.
Comparison of Relays Between the United States and China
| Aspect | United States | China |
|---|---|---|
| Focus | High reliability, industrial & smart relays | Cost-effective, mass production & rapid innovation |
| Market | Industrial automation, aerospace, automotive | Consumer electronics, industrial automation, exports |
| Innovation | IoT integration, energy efficiency, predictive maintenance | Compact design, solid-state relays, renewable energy |
| Quality | Premium, certified for high standards | Improving, balancing cost and performance |
From the table, it’s clear that U.S. relay manufacturers focus on high-reliability, industrial-grade relays with advanced smart features, targeting niche applications like aerospace, automotive, and high-end industrial automation. Their innovations prioritize energy efficiency, IoT integration, and predictive maintenance, making them leaders in quality and performance.
In contrast, Chinese manufacturers emphasize cost-effectiveness, mass production, and fast innovation cycles to meet both domestic and global demand. They are improving in areas such as solid-state relays, compact designs, and renewable energy applications. A leading example is CDGKZ, which combines reliable performance with competitive pricing, making it an excellent choice for industrial and commercial relay solutions.
FAQs
Q1: Who are the top 6 U.S. relay manufacturers in 2025?
A1: The leading companies include TE Connectivity, Schneider Electric, Omron, Honeywell, ABB, and Eaton. They are known for innovation, reliability, and industrial-grade products.
Q2: What makes these manufacturers stand out in the relay market?
A2: They lead in smart relay integration, durability, and energy efficiency. Their products support automation, IoT connectivity, and high-performance industrial applications.
Q3: Are these relays suitable for industrial automation?
A3: Yes, all six manufacturers provide relays designed for automation systems, ensuring high reliability, long lifespan, and seamless integration with modern industrial equipment.
Q4: How do U.S. relay manufacturers compare to international brands?
A4: U.S. manufacturers focus on premium quality, advanced technology, and compliance with industrial standards, often outperforming in high-precision and smart relay solutions.
Q5: Where can I purchase relays from these top U.S. manufacturers?
A5: Relays are available through official distributors, online industrial suppliers, and authorized resellers, ensuring warranty support and access to technical resources.
Conclusion
Selecting the right relay manufacturer affects system performance, safety, and efficiency. While experience matters, innovative brands often push technology boundaries with smarter solutions.
Among these leaders, CDGKZ stands out for combining advanced engineering with dependable quality. Its high-performance relays and technical support make CDGKZ a trusted partner for projects demanding reliability and cutting-edge technology in 2025.
