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Solid state relays, or SSRs are electrical switching devices that serve the same purpose as electromechanical relays, but without the moving parts hence the name 'solid state'. By having no moving parts, the SSR tends to have a longer operational lifetime as they are not subjected to wear and tear.

Solid state relays can switch faster than their electromechanical counterparts, as they use the electrical and optical properties of semiconductors to perform the switching functions. RS offer an extensive range of solid state relays from trusted brands, including Celduc, Sensata/ Crydom, Omron, Phoenix Contact, and many others.

### Where are solid state relays used?

SSR’s are used across a wide range of industrial settings such as industrial control, robotics, data acquisition, medical equipment, data acquisition, and are used to control power delivery for lighting, heating, motion-based equipment as well as numerous other applications due to the highly diverse nature of the SSR.

### What are the advantages of an SSR?

The main advantages of SSR relays over conventional electro-mechanical relays is that they have no moving parts to wear out, and therefore no contact bounce issues. SSRs can switch both ON and OFF much faster than a mechanical relays armature can move, as well as zero voltage turn-on and zero current turn-off, eliminating both electrical noise and transients. For more information, please see our comprehensive [guide to solid state relays](https://uk.rs-online.com/web/content/discovery/ideas-and-advice/solid-state-relays-guide).



Browse our latest Solid State Relays (SSR) offer. Place your order today for our Solid State Relays (SSR).

Solid State Relays | SSR | RS

Solid State Relays

Siemens Solid State Relay Panel Mount 24 V dc Control

Siemens 3RF23 Series Solid State Relay DIN Rail Mount, 600 V Load

Siemens Solid State Relay Panel Mount 30 V dc Control

Siemens Solid State Relay DIN Rail Mount 24 V dc Control

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Celduc Solid State Relays | RS Components

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12V Solid State Relays | RS

<p>Solid state relays or SSRs are used across a wide range of industrial settings and in numerous applications. As their name would suggest, they have no moving parts, which gives the SSR a longer lifespan. </p><p>They are used to control electrical loads by a switch that is activated by electronic signal rather than a mechanical switch. AS well as their compact size, making the SSR the relay of choice with less mounting space needed due to lower weight and dimensions.</p><p>Here at RS we can offer you a range of 12 V solid state relays all bringing individual benefits to your application.</p>

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OMRON Solid State Relays | RS

<p>For fast, dependable switching Omron's range of solid state relays is the go-to solution. Omron have a broad selection of solid state relays here at RS to suit your needs.</p><h2>What's Solid State Relay? </h2><p>Also known as SSRs, solid state relays are a type of electronic switching device. Relays work by opening or closing a set of contacts between two circuits to make or break the circuit, which will allow or restrict the flow of current as needed.</p><h3>How are solid state relays different to electromechanical relays? </h3><p>Unlike electromechanical relays SSRs do not use moving parts – this ensures they have a longer life span as they are subjected to less wear and tear. Instead, they convert the incoming electrical signal to an optical signal, which is projected across a space to be received by a photosensitive transistor. This will then send the signal on to other electrical components, completing the circuit. They are also faster at switching than electromechanical relays, are maintenance free, and operate silently.</p><h4>Where are solid state relays used? </h4><p>This type of relay is used in a wide range of industries such as: Robotics, motor control, industrial controls, instrumentation, medical equipment, home appliances, automotive, and power distribution.</p><p>Omron's solid state relays come with various features and advantages such as LED indication of operating status, compact dimensions, high switching capacity, hand-free structure for easier wiring work, PCB mounted options, integrated heat sinks, long operational life, built-in varistors, and wide operating temperature ranges. The G3 range includes popular series such as G3VM, G3NA, G3PE, G3PH, and G3PA.</p><p>In industrial environments relays are an essential part of ensuring that your operations run smoothly. Omron relays incorporate high standards and careful design considerations, to give you total peace of mind.</p><p>They produce over 800 million relays a year from their state-of-the art facility in Japan, and have been designing and manufacturing relays for over 50 years, so you can be sure that their SSRs offer excellent quality, performance, and durability.</p>

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ABB Solid State Relays | RS

<p>ABB solid state relays (SSRs) are electrical switching devices that perform switching functions quickly and efficiently. Solid state relays are ideal for both new applications, where reliable operation is required, or existing operations, where an exact replacement is essential. ABB SSRs are ideal for use across a wide range or industrial applications including robotics, industrial control, medical equipment, data acquisition, and much more.</p><p>Solid state relays come available in several different mounting styles, covering a wide range of voltage and current ratings. The different mounting styles available include panel mount, DIN rail mount, PCB mount, and more. They can be used to control many different types of load in applications such as heating and lighting operations.</p><h2>What are the differences between an SSR and an electromechanical relay?</h2><p>Electromechanical relays and solid-state relays perform the same switching actions, but electromechanical relays move parts at the same time, whilst SSRs don't. Since SSRs have no moving parts, they generally have a longer operational lifetime, as they are not subjected to wear and tear. SSR's can switch faster than electromechanical relays, as they use electrical and optical properties to perform the switching actions. SSRs also have a faster switching speed, a higher resistance to shock and vibration and less acoustical noise, than an electromechanical relay.</p>

Siemens Solid State Relays

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