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Let our Frequently Asked Questions guide you to find what you’re looking for.

General FAQs

If you know the part number you want to purchase, you can go to our Tools section and use the Distributor Stock Check to search for that specific part number. If you prefer to contact a sales representative you can check our Authorized Distributors and find one in your area. If you need further assistance on which product is right for your application you can also contact our Tech Support team.

We only sell through our authorized distributors, feel free to search for your local Distributor.

For Distributors the minimum is $500.00 USD and for OEM’s $1,000.00.

Please contact an authorized distributor from our distributors list or send your request to

Our Tech Support team is available to assist you by phone or email, contact the team in your area.

Under our Tech Library section, select Brochures and a list of all Crydom available literature will be displayed and available for download. If you wish to receive a hard copy of a specific brochure or flyer please contact the customer service team in your area. Make sure you to provide them with the brochure or flyer title, part number and number of pieces you we wish to receive. Not all brochure or flyers are available in hard copy.

You can make your request to our Customer Sales Team or a Crydom Sales Representative. If you are not sure about the Crydom part number needed, our Tech Support team will gladly advise you on the best solution for you.

If you are not sure about the part number suitable for your application please contact our Tech Support team and they will guide you in your product selection.

Visit the Tech Library menu, you will find our products’ Brochures, CAD Drawings, Videos, Installation Sheets, useful Tech Tips and Crydom Insights covering several topics.

Our Inside Sales Teams will be glad to follow up on the status of your order. Make sure to contact the sales team in your area.

If your product is not working correctly, please contact our Tech Support, they will guide you on the right installation of the product and check if the part is suitable for your application, if the problem continues they will advise you on how to return the part.

Visit the Installation Sheets section and search for the proper installation sheet for the part you are going to install. If the product you are looking for is not in the installation sheets section please contact our Tech Support team for assistance.

We have several drawing formats available for download on the CAD Drawings page under Tech Library. Identify your product Series and select the drawing format you wish to download. If you can’t find the drawing you are looking for, please contact our Tech Support team.

Crydom’s Custom Solutions Division offers a variety of modifications that can be applied to our basic product lines. Contact your Crydom Distributor or Sales Representative to request your customized solution.

Crydom is a brand of Sensata Technologies. Sensata Technologies is committed to growth and development of its employees; the ability to think globally and drive results while being responsible and respectful. Visit the Careers section of Sensata Technologies and search for the country you are interested in applying for.

If you have any other questions please contact a Crydom representative in your area.

Technical FAQs

A Solid State Relay (SSR) is a totally electronic device that depends on the electrical, magnetic and optical properties of semiconductors to control the flow of current in a circuit. SSRs are an alternative to Electro-mechanical relays offering enhanced electrical performance and reliability. The main characteristic of a Solid State Relay is that it has no moving mechanical parts, which translates into a much higher life expectancy, among other benefits.

Read SSR - The Inside Story and find out more about how Solid State Relays work

Solid State Relays have several benefits against their electromechanical counterparts. The following are only a few of them:

  • Extremely Long Life
  • Silent Operation
  • No Moving Parts Eliminates Arcing & Switch Bounce
  • Resistant to Shock and Vibration
  • Reliable Operation in Harsh Environments
  • Operation is Not Dependent Upon Orientation
  • Low Input Power Consumption
  • Reduced Electromagnetic Interference

Take a look at this SSR & SSC Handout and discover more advantages of Solid State Relays.

When selecting a Solid State Relay several aspects must be taken into consideration, such as:

  • Load Voltage
  • Load Current
  • Input Voltage
  • Ambient Temperature
  • Mounting Style (PCB, Plug-in, Panel or DIN Rail mounting)
  • International Approvals (UL, CSA, VDE, TUV, etc.)

For more detailed information about how to select an SSR please take a look at Selecting a Solid State Relay.

SSRs offer a high reliability alternative to electro-mechanical relays when switching a wide range of loads such as motors, heaters, solenoids, lamps, compressors, fans, among others, in applications as diverse as:

  • Coffee machines
  • Commercial / Industrial cooking equipment
  • Packaging machinery
  • Plastic machinery (extrusion/thermoforming)
  • HVAC & R systems
  • Lighting control systems
  • Lifts and escalators
  • Medical equipment

For more application examples, including product recommendations visit our Markets page.

Unlike a typical electromechanical relay, there are several variables that will directly impact the life expectancy of a solid state relay in a given application. These variables primarily revolve around the electrical characteristics of the application, but some mechanical issues also impact the relay's life expectancy.

To assist with evaluating the reliability of their Solid State Relays, Crydom commissioned an independent specialized company to analyze the designs of several different Crydom SSR models. The final result yielded a MTBF rating of between 5 million and 34 million hours, depending upon the product family.

Read detailed information about how the MTBF for a solid state relay is calculated and MTBF for different types of Crydom products.

The following are some recommendation for the 4 pin header connectors that can be used with our Dual and Quad SSR’s with .025” square input pins:

  • Amp: 640440-4, (AWG 22); 640441-4, (AWG 24); 640442-4, (AWG 26)
  • Molex: 14-60-0043; 14-60-0041; 14-56-6049; (for AWG 26, 24, and 22 respectively). These Molex parts come with the sockets pre-loaded.

Further information on Crydom Dual SSRs can be found in What are Dual Solid State Relays?.

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