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This section provides an overview for solid state relays as well as their applications and principles. Also, please take a look at the list of 19 solid state relay manufacturers and their company rankings.
Table of Contents
Solid State Relays are contactless relays that use semiconductors to transmit input signals to output circuits.
Generally, they are suitable for situations where relays are frequently opened and closed and high-speed response is required since high response and long life can be established.
Solid State Relays are used in situations where the on/off frequency is high, such as in temperature control systems, where their high responsiveness and long life can be maximized.
In addition, unlike general contact-type relays that use magnetic force, there is no mechanical sliding contact. Since no noise is generated by the opening and closing of the contacts, they are often incorporated into products that are vulnerable to noise.
On the other hand, the transmission of signals uses light emission phenomena via semiconductors and diodes. Therefore, there is no small amount of temperature rise effect and the output stage is a semiconductor device. Care must be taken because some parts are not suitable for products with high voltage and high current.
Figure 1. The principle of semiconductor relay
As the relay is said to be contactless, the circuit on the input side is physically isolated from the circuit on the output side, and the signal is transmitted through an opto-isolated device such as a photocoupler.
When an electric current is applied to a light-emitting diode on the input side, the diode emits light, and a circuit on the output side receives the light, and the output circuit operates when the light is detected. Depending on the supplier of Solid State Relays, photodiode arrays, photocouplers, and phototriacs are used for the light-receiving circuit, and variations such as MOSFETs and triacs exist for the output section.
The use of light for signal transmission provides a very fast response. Also, since they do not have mechanical contacts, the contact parts do not wear out, and they generally have a longer service life than contact-type relays.
Other features include the fact that the input and output are completely insulated by an insulating element, so noise generated on the input side is less likely to be transmitted to the output side.
First, it is necessary to consider how much responsiveness is required in the circuit where the relay is needed and how often the signal is transmitted. If you do not need such high responsiveness and only low-frequency signal transmission, general contact-type relays are often smaller and less expensive.
If a Solid State Relay is required, also check the maximum current value of its input signal. Since Solid State Relays are output circuits using semiconductors, excessive current flow will damage the semiconductors themselves, rendering them unusable for further use.
Figure 2. Semiconductor relay and mechanical relay
The difference between a Solid State Relay and a Mechanical Relay is whether they are contactless or contactless types. Semiconductor Relays, also called Solid State Relays, are contactless relays, while Mechanical Relays are contact relays.
Solid State Relays with no contacts are switched on and off by signal transmission only, with no mechanical closing or opening in the electronic circuit. A mechanical relay with contacts has movable parts built into the circuit and uses a coil to generate an electromagnetic force that causes the contacts to make contact and switch ON/OFF.
Solid State Relays and Mechanical Relays each have the following features, which can be used according to your needs.
Solid State Relays have the advantage of being compact and capable of opening and closing at high speeds, and they do not suffer from contact wear and failure as mechanical relays do. On the other hand, mechanical relays have almost no ON resistance, and their strength is that they can be easily used in circuits with high voltage and high power.
Automobiles are equipped with many relays as parts that control the operation of lamps, windshield wipers, audio equipment, motors, blinkers, and so on. In general, mechanical relays have been used for automotive relays.
However, mechanical relays have the disadvantages of limited contact life and large installation space. In recent years, the number of electrically driven in-vehicle devices has been increasing due to the need for low fuel consumption and low power consumption and the multifunctional nature of advanced technology, which has created a need for smaller and lighter relays.
Figure 3. Example of automotive semiconductor relay specifications
Solid State Relays have been developed for automotive applications to overcome the shortcomings of mechanical relays and are gradually replacing them. Figure 3 shows an example of Solid State Relay specifications for automotive applications.
The use of Solid State Relays has made it possible to reduce size and weight, which not only secures space in the vehicle but also contributes to improved fuel efficiency. In addition, the use of high current, which has been a bottleneck, can now be handled thanks to low ON-resistance achieved through advances in semiconductor technology.
*Including some distributors, etc.
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Sensitron Semiconductor, founded in 1969 with corporate headquarters located in the USA, is a manufacturer of power electronic components and systems for the defense, aerospace, space, and medical markets. The company's products include high-power rectifier bridges, motion control modules, TVS modules, solid-state power controllers, and high voltage diode assemblies, as well as various services including, engineering, electrical and mechanical design, material science expertise, and testing of a finished power system. The company's facility includes a wafer fabrication clean room and a microelectronics manufacturing clean room.
Vishay Intertechnology, Inc. (Vishay) was incorporated in 1962 and is headquartered in Malvern, Pennsylvania. The company serves the industrial, automotive, telecommunications, consumer products, and medical end markets and sells its products under numerous brand names inlcuding Siliconix, Draloric, Beyschlag, UltraSource, and Applied Thin-Film Products. The company manufactures and sells discrete semiconductors and passive electronic components in globally while operating in six market segments: MOSFETs, diodes, optoelectronic components, resistors, inductors, and capacitors.
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.
The Carlo Gavazzi Group is a multinational company that was established in 1931 in Milan, Italy, known for designing, manufacturing, and distributing electronic equipment and automation solutions. The company offers a wide range of products that includes automation components such as monitoring relays, sensors, timers including electronic controls. There are also energy management solutions, and these products are supplied to industrial manufacturers of semiconductors, plastic machinery, agriculture, HVAC, and mobile equipment to name a few. Building automation companies and renewable energy services also benefit as they streamline their operations, reduce energy costs, and increase productivity.
Wenzhou DAQUAN Electric Co., Ltd was founded in 1996 in Wenzhou, China. The company is an electrical products manufacturer of relays, relay sockets, timers, meters, and related components to customers both in and outside of China and serves both home appliance customers as well as industrial customers in manufacturing and other industries. The company has 5 major product segments including relays, timers, meters, circuit breakers, and switches. The company also sells various tools, alarm devices, and product accessories.
Cosmo Electronics Corporation has been a manufacturer of photo couplers and relays based in Taiwan since 1981. The company produces a wide range of photo couplers that are designed to give different types of output. There are also different types and forms of Reed Relay and Solid State Relay and these products have applications in the power industry such as being implemented in adapters and UPS including smoke detectors, home security panels, and cameras. They are also used in Industrial based products such as NC machine tools, robots, and solar power conditioners and also by Consumer Electronics and the Automotive Industry.
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.
LOVATO Electric S.p.A., founded in 1922 and based in Bergamo, Italy, is a manufacturer and designer of low-voltage electrical devices for industrial applications. The company offers a wide range of products such as Motor Protection circuit breakers, Contractors, electromechanical starters and relays, variable speed drives, and soft starters among others. The company holds UNI ISO 45001: 2018, ISO 1400: 2015, and ISO 50001: 2018 certificates. The company’s laboratories are certified to conduct type testing under ACAE control to issue ACAE certifications which are recognized by the European Union and valid across the wold.
RKC Instrument has been continually growing for over half a century and strives to be a solution provider of measurement and control systems. RKC supplies quality products and professional engineering services quickly and efficiently. RKC specializes in everything from limit and multiloop controllers to heater break alarms and temperature sensors. RKC has a website in Chinese, English, and Japanese and has sales networks across the globe. Based on the management concept of “Realization of the highest quality,” RKC Instrument has obtained the accreditation of ISO9001, the international standard for quality management systems.
Chino, headquartered in Tokyo, Japan, is engaged in the manufacture and sale of measurement and control equipment and instrumentation work. The company was founded in 1936 as Chino Seisakusho. Chino operates in the area of "measurement, control, and monitoring" and contributes to the development of all industrial fields. Major products include recorders, regulators, temperature sensors, data loggers, radiation thermometers, thermal image measuring devices/thermal cameras, composition meters, moisture meters, thickness meters, thyristor regulators, and fuel cell evaluation and testing devices.
Wieland, established in 1910 and based in Bamberg, Germany, is a manufacturer and supplier of electrical connection technology. Their product range includes pluggable connections for seamless plug-and-play electrical device connections, insulated connectors that provide electrical insulation in device connections, cable glands for safeguarding cables and ensuring a watertight seal, terminal blocks used for connecting electrical wires, and contact systems facilitating connections between electrical components. Wieland's products find applications in diverse industries, such as building construction, electrical engineering, and automation.
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.
Shimaden Co., Ltd. is a manufacturer of industrial temperature and humidity control equipment founded in 1953 and based in Tokyo, Japan. The company manufactures a wide range of products for monitoring and controlling environmental factors. Its products include various sensor converters for humidity, digital or analog flow rate controllers, and thyristor power regulators for controlling isothermal tanks. These products are mainly used by clients in the food and beverage, chemical processing, and metal fabrication sectors. The company also offers control and data acquisition software for customers needing additional support.
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.
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.
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.
Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
Japan
|
5 | 33.3% |
|
United States of America
|
3 | 20.0% |
|
Italy
|
2 | 13.3% |
|
Taiwan
|
2 | 13.3% |
|
China
|
1 | 6.7% |
|
Germany
|
1 | 6.7% |
|
Switzerland
|
1 | 6.7% |
92 products found
92 products
JEL SYSTEM CO,LTD.
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■Summary A solid state relay (SSR) is a semiconductor control component that, like an electromagnetic relay (EMR), has an insulated input and outpu...
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■Summary A solid state relay (SSR) is a semiconductor control component that, like an electromagnetic relay (EMR), has an insulated input and outpu...
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■Semiconductor miniature solid state relay Our Opto-MOSFET relays are solid state relays focused on high load voltage capability with optically iso...
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Infineon Technologies Japan Co., Ltd.
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■Summary Infineon's solid state relay products include HEXFET® power MOSFETs and IGBT output photorelays, as well as photoisolators that give desig...
Shinko Technos Co., Ltd.
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Nimatsu Electric Co., Ltd.
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■What is solid state relay (SSR)? Generally abbreviated as SSR, it is a device that turns on/off power to the heater using a semiconductor relay (t...
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■What is solid state relay (SSR)? Generally abbreviated as SSR, it is a device that turns on/off power to the heater using a semiconductor relay (t...
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SHIMADEN
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■Product description Medium power SSR with maximum load current of 10, 20, 40A. A heatsink (optional) can be selected. Operation display LED is sta...
SHIMADEN
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Bright Toward Industrial Co., Ltd
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■Solid state relay TOWARD RELAYS™ solid state relays can switch high currents from 8 amps to 125 amps to meet your needs. In addition to high load ...
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Autonics Corporation
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■Summary The SR1 series, a single-phase heat sink separated type SSR, uses a ceramic substrate to improve heat dissipation efficiency, and its gene...
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Autonics Corporation
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■Summary The SRC1 series, a single-phase slim heat sink separated type SSR, uses a ceramic substrate to improve heat dissipation efficiency. It is ...
Autonics Corporation
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■Summary The SRS1 series, a single-phase socket type SSR, has a withstand voltage of 2,500VAC and is comprised of Type A, Type B, and Type C depend...
Autonics Corporation
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■Summary The SR2/3 series, a 2/3-phase heat sink separated type SSR, has two types of mounting holes and can be mounted on a variety of heat sinks,...
Autonics Corporation
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■Summary The SRH2/3 series, an SSR with integrated 2/3-phase heat sink, maximizes heat dissipation efficiency with a dedicated heat sink that is re...
