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This section provides an overview for power relays as well as their applications and principles. Also, please take a look at the list of 30 power relay manufacturers and their company rankings. Here are the top-ranked power relay companies as of June, 2025: 1.Amperite Co., 2.Xiamen Hongfa Electroacoustic Co.,Ltd., 3.FUJITSU COMPONENT LIMITED.
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.
Power relays are relay components capable of carrying a current greater than 3A.
Relays can be roughly classified into two types: contact relays and non-contact relays, and power relays are contact relays. Power relays are of robust construction to withstand large currents, as they are expected to carry larger currents than general control relays.
Because of their characteristics, power relays are sometimes used as relays for safety circuits when an abnormally large current flows in a circuit.
Power relays are one of the most widely used components in industry.
The following are examples of power relay applications:
Power relays are composed of terminals, contacts, and electromagnetic coils.
The terminal is the part that connects to the wiring. In many cases, Power Relays are fixed to the wiring by solder wear. In other cases, Power Relays are mounted on a terminal block unit and the wiring is connected to round terminals or other terminals that have been processed.
Contacts are driving components that provide a path for electricity. There are larger and more numerous contacts with a higher current application.
To reduce electrical resistance, silver alloys and gold are used for contacts. Silver alloys are widely used because of their low electrical resistance. Gold alloys are more resistant to oxidation than silver alloys, but they have a lower melting point and are more expensive, making them suitable for small loads.
There are two types of contacts in power relays: movable contacts and fixed contacts. Fixed contacts are firmly fixed to the casing or other components. The movable contacts are driven together with the movable iron strip, and when they make contact with the fixed contacts, they conduct electricity.
The electromagnetic coil is a component that drives the movable iron strip by electromagnetic force. The movable iron strip has a movable contact point, which is brought into contact with the fixed contact point by the electromagnetic force of the electromagnetic coil. When the electromagnetic coil is de-energized, the contacts are pulled apart or in contact with each other by a spring.
Power relays are broadly classified into DC-driven relays and AC-driven relays.
DC-driven relays are power relays in which the coil is driven by a DC power source. DC power sources are resistant to inductive voltages and are characterized by stable operation even at low voltages. The relay coil is often connected to a diode to prevent reverse current.
The standards include 5 VDC, 12 VDC, 24 VDC, etc., which are used according to the intended use. A 24V power supply with a higher voltage is used when the transmission distance is long or when a relay circuit is built in a control panel. For intrinsically safe explosion-proof circuits, 12 VDC, 5 VDC, etc. are used.
The AC drive is a power relay whose coil is driven by an AC power source. The commercial power supply is AC power and can be used directly, eliminating the need for a power supply required for the DC version.
Coil voltages of 100 VAC or 200 VAC are used; AC400 V control circuits are rarely used due to the difficulty of maintaining isolation distances.
Power relays are mechanically actuated by electromagnetic forces and have a limited life span. The life expectancy in terms of number of operations is about several hundred thousand times.
If the life is exceeded or excessive shocks are applied, the following failures can occur:
1. Coil Disconnection
This is a failure in which the electromagnetic coil in the power relay is disconnected. The coil disconnection causes all contacts to cease operation. This failure is relatively easy to detect because there is no sound of the contacts operating.
2. Welding
This is a failure that occurs when excessive current flows through the power relay, causing the contacts to weld together and not open. Diagnosis is made by switching the relay on and off and checking the continuity of the contacts.
3. Inoperative Contacts
This is a malfunction in which the relay contacts become frayed or dirty, resulting in a loss of electrical continuity. The contacts remain open without shorting. Diagnose by checking continuity and voltage, as in the case of welding.
4. Short-Circuiting of Coils
This is a failure that occurs when the varnish on the electromagnetic coil peels off, resulting in a short circuit. When the electromagnetic coil is energized, the control power supply itself is tripped, and this is identified.
Since control circuits often have multiple power relays connected in parallel, it may take some time to detect the fault.
*Including some distributors, etc.
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Sealevel Systems Inc. is a designer and manufacturer of communications products and industrial computers founded in 1986 and located in Liberty, South Carolina, USA. The company’s products include ethernet serial servers for connecting serial devices to ethernet networks, input-output (I/O) modules for data control and acquisition applications, and embedded computers for integrated systems. It also offers PCI express cards and USB serial adapters, and ruggedized computers for industrial environments. The company is ISO 9001: 2015-certified, and serves clients in the military and defense, aerospace, and industrial automation sectors.
Mors Smitt Technologies Inc. stands as a manufacturer and supplier of components for the railway and industrial sectors, founded in 1851 and headquartered in Ede, Gelderland. Its portfolio includes relays, safety-critical electronics like circuit breakers and sensors, and precise measuring and control solutions such as data loggers and controllers. Notably, its offerings extend to panel indicators like digital displays and warning lights, as well as test equipment such as insulation testers and relay testers. With subsidiaries in the UK, Germany, and the US, Mors Smitt is a pivotal player in delivering solutions for signaling, safety, and control in critical applications.
Sensata Technologies was originally founded in 1916 as General Plate Company and is now headquartered in Attleboro, Massachusetts. The company is a developer, manufacturer, and seller of sensors and sensor-rich solutions, electrical protection components, and other products used in automotive, industrial, energy, telecom, and construction industries. The company has 20 product categories including force sensors, tire management solutions, inverters & charges, and pressure sensors.The company’s next generation of products are designed to improve the efficiency of industrial pumps, fuel efficiency in ICE cars and energy efficiency in TVs, and facilitate usage of IoT devices.
Amperite Co., through OlympicControls Corp., was founded in 1968 with roots going back to 1922. The company serves military and industrial market segments with motor controls, circuit controls, alarms, and other systems. The company offers four specific, focused business units that maintain identities in separate end-user applications: Amperite Co., OlympicControls Relays, T-Bar Relays, switches, and Fuel Pumps. Amperite manufactures time delay relays, flashers, and controlling devices. OlympicControls offers customized products manufactured to customer specifications. T-Bar Relays serves OEMs and customers such as Raytheon and Learjet. Fuel Pumps serve military and heavy-duty trucks.
L.A. Woolley Electric, Inc. (L.A. Woolley) was founded in Buffalo, New York in 1916 as a supply distributor to serve the industrial and commercial marketplace. The company offers products from such manufacturers as Acme, Mersen, Pass & Seymor, and Wago. The company specializes in control and panel board products, transformers, terminal blocks, wiring accessories, as well as hazardous location products. The company's in-house sales team also support customers in selecting, ordering, and receiving the correct order.
Governors America Corp, also known as GAC, was founded in 1986 and based in Agawam, Massachusetts. GAC is a vertically integrated global distributor of engine control products. GAC serves industries including power generation, mining, transportation, heavy equipment, and marine industries and is AS9100:D and ISO 9001:2015 certified. GAC products are in categories such as actuators, speed controllers, gaseous fuel and ignition management systems, generators, and accessories. GAC’s product design capabilities include software design, electronic component design, as well as mechanical design.
E-T-A Circuit Breakers, founded in 1955 and headquartered in Mt. Prospect, USA, is a manufacturer of circuit breakers for equipment protection and circuit protectors. The company's product portfolio includes circuit protection devices, power management systems, and solid state remote power controllers (SSRPCs). Its circuit breakers are available in more than 150 models and 350,000 different configurations. It also develops intelligent power distribution systems for power distribution and overcurrent protection for industrial applications, watercraft, and vehicles. The company has acquired ISO 9001 and IATF 16949 certifications and complies with the RoHS and REACH standards.
Founded in 1984, Xiamen Hongfa Electroacoustic Co., Ltd. is a manufacturer specializing in relays, connectors, precision manufacturing parts, and automation equipment. Headquartered in Xiamen, China, the company has established 30 subsidiaries worldwide, serving over 120 countries and regions. HONGFA offers customized solutions utilizing its electrical appliances and complete equipment. Its wide range of products finds applications in various industries such as smart homes, smart grids, industrial control, automotive and railway transportation, and the Internet of Things. The company has received multiple awards, including the 2023 National Enterprise Culture Outstanding Achievement by China Enterprise Confederation and China Entrepreneurs Association.
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.
TELE, established in 1963 and headquartered in Vienna, Austria, is a manufacturer specializing in monitoring technology, control technology, and power electronics. Its product range includes time relays, monitoring relays, load monitors, grid and system protection equipment, and soft starters, designed for applications in various industries such as energy, water, infrastructure, industrial machines, and building technology. The company holds ISO 9001:2015 and ISO 14001:2015 certifications for quality and environmental management systems. It also plays a crucial role in providing electrical solutions for diverse sectors.
Fujitsu Component Limited was founded in Japan jointly by Fujitsu Limited and Takamizawa Electric Co. Ltd in 1995 which is a global manufacturer and seller of switching devices (relays) and Human interface devices such as keyboards, thermal printers, touch panels and switches. Their relay portfolio consists of relays for signal, power and automobiles applications. In addition they also manufacture eco friendly relay products. Fujitsu has establish several global support centers worldwide to ensure uninterrupted service. The group has adopted an environment philosophy which states that they will adhere to the corporate activities while improving their coexistence with the environment.
MPI was founded in 1999 and is based in Toronto, Ontario. MPI is a designer, engineer, and manufacturer for heaters, sensors, controllers, relays, and other related products. MPI’s product categories include cartridge heaters, band heaters, strip heaters, coil & cable heaters, melt pressure products, drum heaters, heated hose, heater accessories, tubular heaters, immersion/process heaters, silicone/flexible heaters, thermocouples, RTDs, temperature controllers, linear transducers, cast-in heaters, mercury contractor relays, Watlow thermocouples/RTDs, and other products including various controllers and accessories.
Zhejiang Fanhar Electronics, founded in China, is a manufacturer of relays used in household appliances, electric appliances, and smart home automation. The company's product portfolio includes Power Relays, Industrial Relays, Electric latching Relays, Signal Relay and New energy Relays. The company serves industries such as Oil and Gas, Aerospace and Defense, Automotive and Transportation, Construction, and Power Generation. The company has 20 national patents and also provides services such as mold manufacturing, design and development, prototyping and technical support.
Goodsky Electric Co., Ltd., established in 1989, and based in Taiwan, is a manufacturer and supplier of electromechanical relays and related products. The company’s products include power relays, signal relays, automotive relays, general-purpose relays, and latching relays, applied in home appliances, automotive, industrial automation, telecommunications, and more. Known for reliability and precision, Goodsky's relays excel in critical applications. They prioritize customer satisfaction, consistently providing advanced solutions to meet market demands. Goodsky delivers impressive discounts through good products, compliance with international standards, and outstanding customer service and technical support.
Tianbo Electronics Co., Ltd., founded in 1992 in Ningbo, China, is a manufacturer and supplier of good quality electromechanical relays and related components. Tianbo's product range includes power relays, signal relays, automotive relays, and general-purpose relays, all designed to meet the diverse needs of customers. The company specializes in providing good and efficient relay solutions for various industries, including automotive, household appliances, and telecommunications. With a motive for customer satisfaction, Tianbo continues to be a good provider of cutting-edge relay technology.
Perry Electric S.r.l, founded in 1969 and based in Veniano, Italy, is a manufacturer and designer of systems and equipment for energy, temperature, time, and safety control. The company offers a wide range of products, including devices called chronothermostats that allow you to set the time at which the room temperature must be maintained, heat metering systems, components for systems, and much more. The company has achieved the ISO 9001: 2015 and the IQNET recognized certificate for maintaining a quality management system.
TE Connectivity Ltd., started in 2007 and headquartered in Schaffhausen, Switzerland, is a designer and manufacturer of sensor and connectivity solutions for harsh conditions. It operates three primary segments, namely transport, industrial, and communication solutions, and its product portfolio includes automotive connectors, fiber optic connectors, analog power meters, RTD sensors, and circuit breakers. It serves customers in approximately 140 countries and several industries, including aerospace, automotive, rail, IoT connectivity, and E-mobility. The company manufactures 192 billion products annually and has invested over 610 million USD in research development and engineering.
Omron Corporation, started in 1933 and headquartered in Kyoto, Japan, is a manufacturer of automation components, equipment, and systems, and it developed the first contactless proximity switch in 1960. It has four domains, including industrial automation, electronic components, healthcare, and social systems, and it provides products and services in around 120 countries and regions. Some of its products include microsensing devices, access control systems, industrial robots, surveillance cameras, and blood pressure monitors. In 1971, it developed the first online cash machine, and in 1972, it established Japan’s first welfare factory.
Finder Relays, Inc., established in 1954 and headquartered in Almese, Torino, Italy, is a manufacturer of electromechanical and electronic devices for the residential, commercial, and industrial sectors. Some of its offerings include relays, energy meters, lighting products, and room thermostats. The company provides solutions for the residential, commercial, and industrial sectors on a global scale through an extensive network of sales subsidiaries spanning 28 countries, and has established over 80 distribution partnerships worldwide. All of its products are manufactured in its European facilities located in Italy, France, and Spain.
Struthers-Dunn is headquartered in Timmonsville, South Carolina, and was established in 1923, making it one of the oldest relay manufacturers in the world. The company’s relays and related electrical components are utilized in traffic signals, power generation, factory automation, construction, and water treatment applications. The company’s product lines primarily consist of relays such as general purpose, motor, timer, and sequencing relays. Other products include accessories and special-purpose relays for super high voltage applications such as gas turbine power plants.
ComatReleco is a Swiss specialized manufacturer of multi purpose contactors and relays founded in 1970 following the merger of Comat AG and Releco SA. Headquartered in Worb, Switzerland, the company has a broad product portfolio which includes industrial and timing relays for controlling electrical circuits (ECs), remote control and monitoring devices for accessing ECs, and PLCs/HMIs for automating or monitoring industrial processes. ComatReleco serves a global client base, maintaining a network of partner distributors and subsidiaries in over 60 countries.
ELKO EP HOLDING, SE., established in 1993, and located in Holešov, Czech Republic, is a manufacturer, distributor, and supplier of electronic equipment for residential, office, and industrial automation. The company offers a range of products including time relays, time switches, dimmers, controlling & signaling units, and thermostats, which serves in industries such as resindential, commercial, industrial, infrastructure, and transportation. Its products are used for efficient control and management of various electrical functions.
Layher AG, founded in 1945 in Güglingen, Germany, is a manufacturer and supplier of scaffolding and access systems. The company's comprehensive product range includes modular scaffolding, access solutions, and temporary roofing systems used in the construction, maintenance, and event industries. Layher's new systems provide safe and efficient access to elevated work areas, ensuring worker safety and project progress. Their solutions are used globally in various applications, from large-scale construction projects to entertainment events. The company continues to deliver state-of-the-art scaffolding solutions that meet the diverse needs of industries worldwide. Layher also holds ISO 9001 and ISO 14001 certifications.
Rockwell Automation, Inc. was founded in 1903 and is headquartered in Milwakee, WI. Rockwell Automation provides industrial automation and digital transformation solutions around the world. Rockwell Automation operates through their intelligent devices, software & control, and lifecycle services segments with both hardware and software products and services. The Intelligent Devices segment offers drives, motion, safety, sensing, industrial components, and configured-to-order products. The Software & Control segment provides control and visualization software and hardware, information software, and network and security infrastructure solutions. The Lifecycle Services segment provides consulting, professional services and solutions, and connected and maintenance services through independent distributors.
Doepke Schaltgeräte GmbH was founded in 1956 and is a manufacturer, distributor, and supplier of residual current protection and electricity products based in Norden, Germany. The company's product portofolio includes fire protection switches, modular residual current devices, residual current operated circuit-breakers with integral overcurrent protection, undervoltage measuring relay, and doorbell transformers. The company has obtained the ISO 9001:2015 certificate for the quality management system. The products manufactured by the company are conformed to the standards of RoHS, REACH, and DLS.
Today, DSC-Electronics Germany supplies customers all over the world and offers the largest selection of models on the market, with over 255 customisable low and high-power power supplies (100W to 1MW) and ten product series. In mid-2018, the company moved into a new production facility in the centre of Bonn, further expanding its assembly and service capacities. Production to order makes it possible to implement almost any customer request quickly and effectively, which sets the company apart from other Europe-based competitors
Ranking as of June 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Amperite Co. |
11.9%
|
| 2 | Xiamen Hongfa Electroacoustic Co.,Ltd. |
7.2%
|
| 3 | FUJITSU COMPONENT LIMITED |
6.9%
|
| 4 | Governors America Corp. (GAC) |
6.7%
|
| 5 | E-T-A Circuit Breakers |
6.4%
|
| 6 | Sealevel Systems Inc. |
5.9%
|
| 7 | GOODSKY |
5.8%
|
| 8 | Mors Smitt Technologies Inc. |
5.6%
|
| 9 | TELE Haase Steuergeraete Ges.m.b.H. |
5.5%
|
| 10 | L. A. Woolley Electric, Inc. |
4.2%
|
Derivation Method
The ranking is calculated based on the click share within the power relay page as of June 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 (%) |
|---|---|---|
|
United States of America
|
6 | 26.1% |
|
China
|
4 | 17.4% |
|
Japan
|
4 | 17.4% |
|
Taiwan
|
2 | 8.7% |
|
Switzerland
|
2 | 8.7% |
|
United Kingdom
|
1 | 4.3% |
|
Austria
|
1 | 4.3% |
|
Canada
|
1 | 4.3% |
|
Czech Republic
|
1 | 4.3% |
|
Germany
|
1 | 4.3% |
83 products found
83 products
Yasudenso Co., Ltd.
390+ people viewing
Last viewed: 2 hours ago
■The structure does not require gas, so there is no risk of explosion due to arcing. It is also possible to detect disconnections and short circuit...
Yasudenso Co., Ltd.
500+ people viewing
Last viewed: 17 hours ago
■Power relays that are resistant to inrush current and have very few contact failures. Automotive contact relay with maximum 300A IP6K9K level high...
3 models listed
IDEC Co., Ltd.
490+ people viewing
Last viewed: 1 hour ago
Features ■Safety design of 3mm between contacts of the same polarity Compatible with information equipment primary circuit interlock requirements (...
IDEC Co., Ltd.
530+ people viewing
Last viewed: 7 hours ago
■Features ・Small high capacity power relay ・It has a high capacity contact of 10A, and the external size of the 1c to 2c contact type is small an...
MIKASA SHOJI CO.,LTD.
310+ people viewing
Last viewed: 22 hours ago
■Summary ・Achieving a product that is small and capable of high capacity control ・Flux-tight structure suitable for automatic soldering dip ・Sem...
EM Device Co., Ltd.
280+ people viewing
Last viewed: 11 hours ago
The AC relay AX1 series is suitable for on-board charger (OBC) applications in electric vehicles such as PHEVs and EVs that require high performanc...
EM Device Co., Ltd.
320+ people viewing
Last viewed: 8 hours ago
The AC relay AX1 series is suitable for on-board charger (OBC) applications in electric vehicles such as PHEVs and EVs that require high performanc...
EM Device Co., Ltd.
250+ people viewing
Last viewed: 20 hours ago
The EU2 series is a compact relay for automotive electrical equipment that supports ultra-low profile surface mounting and is approximately 77% tal...
EM Device Co., Ltd.
310+ people viewing
Last viewed: 7 hours ago
The EX2 series is an ultra-compact relay for automotive electrical equipment that is approximately 75% smaller in volume than the conventional ET2 ...
EM Device Co., Ltd.
350+ people viewing
Last viewed: 11 hours ago
The EX1 series is an ultra-compact relay for automotive electrical equipment that is approximately 65% smaller in volume than the conventional ET...
EM Device Co., Ltd.
260+ people viewing
Last viewed: 4 hours ago
The ET2 series is a compact relay for automotive electrical equipment that is half the size of the conventional EP2 series, and is ideal for contro...
EM Device Co., Ltd.
270+ people viewing
Last viewed: 1 hour ago
The ET1 series is a compact relay for automotive electrical equipment that is half the size of the conventional EP1 series, and is ideal for contro...
EM Device Co., Ltd.
360+ people viewing
Last viewed: 3 hours ago
The EM1 series is a compact, high-capacity relay for automotive electrical equipment that has a current-carrying performance one rank higher than t...
EM Device Co., Ltd.
330+ people viewing
Last viewed: 21 hours ago
The miniature power relay EM1K series is a printed wiring board mounting type relay for automotive electrical equipment, and is suitable for contro...
EM Device Co., Ltd.
290+ people viewing
Last viewed: 1 day ago
The EL1 series is a compact, high-capacity relay for automotive electrical equipment that has energizing and switching performance one rank higher ...
EM Device Co., Ltd.
280+ people viewing
Last viewed: 14 hours ago
The miniature power relay HX1 series is a printed wiring board mounted relay for automotive electrical equipment, and is suitable for controlling a...
WIN SOURCE ELECTRONICS
130+ people viewing
Last viewed: 1 day ago
■Summary Power relays greater than 2 amps are designed for high current applications and are suitable for a variety of industrial, automotive, and ...
Panasonic Industry Co., Ltd.
100+ people viewing
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
110+ people viewing
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
120+ people viewing
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
100+ people viewing
Last viewed: 51 minutes ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
110+ people viewing
Last viewed: 5 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
110+ people viewing
Last viewed: 5 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
100+ people viewing
Last viewed: 20 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
130+ people viewing
Last viewed: 5 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
90+ people viewing
Last viewed: 17 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
Panasonic Industry Co., Ltd.
110+ people viewing
Last viewed: 5 hours ago
■Power relay (over 2A) ・Mechanical relay with a rated control capacity of 2A or more, ideal for power supply applications such as home appliances ...
