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The 30 amp versions of the CKR series 22.5mm DIN rail solid state relays offer an exceptionally high surge current rating for enhanced reliability in applications, including those using circuit breaker protection!
Crydom, an operation of Custom Sensors and Technologies (CST) and global expert in solid state relay technology, introduces enhanced one-cycle surge current and I2T ratings in the popular 30 amp CKRA / CKRD series 22.5mm solid state relays. Higher surge and I2T ratings are made possible by utilizing larger power semiconductors thus providing greater current handling capabilities.
As part of an ongoing process to improve and validate existing design specifications, engineers at Crydom have increased the 30A CKR series one-cycle surge current and I2T ratings which are now well in excess of the previously published specifications. Utilizing oversized SCR die and with a superior mechanical and thermal design, the CKRxx30 relays now boast a 1,140Apk / 1,200Apk (50Hz / 60Hz) one-cycle surge current rating, and a 6,500A2S / 6,000A2S (50Hz / 60Hz) I2t rating.
These enhanced ratings make the CKR 30 amp series ideal for use in heavy industrial applications where surge currents may be of significant concern, or where branch circuit protection is provided by slower reacting circuit breakers.
Additional features and benefits of the CKR series include a compact 22.5mm DIN mount package, integral heat sink that eliminates the need for additional thermal calculations and assembly, LED input status indicator, 4000V optical isolation, cage-clamp terminals, optional internal overvoltage protection, and an internal RC snubber network. They are available with output ratings up to 30 amps at 530Vac with either zero-crossing (resistive loads) or random turn-on (inductive loads) switching. They are also available with a 4-32Vdc, 90-280Vac, or 18-36Vac input.
The CKR series solid state relays are UL recognized, CSA certified, VDE approved, and RoHS and CE compliant. Crydom’s CKR series are for ideal for use in a wide variety of applications including resistive heating, motor, and lighting control systems.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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New CMX100D10 solid state relay adds to Crydom’s extensive line of DC output SSRs
for high current applications such as heating, lighting and motion control
Crydom, a company of Custom Sensors & Technologies (CST) and global expert in Solid State Relay Technology, introduces CMX100D10, a high power PCB mounted DC output SSR. Crydom's CMX series of FET output printed circuit board mounted DC Solid State Relays previously rated to 6 amps at 100 VDC now includes a new model rated to 10 amps at 100 VDC and 40°C ambient temperature.

The CMX100D10 complements the CMX series that features models rated from 5 to 20 amps at 60 VDC, 6 to 10 amps at 100 VDC, and 3 amps at 200 VDC.
All Crydom CMX series SSRs feature outputs with low on-state resistance FETs for efficient DC load control, 2500 VAC optical isolation, logic compatible DC control input and industry standard PCB mounting footprint in an epoxy package designed for full output rated operation at 40°C ambient temperature.
Crydom DC output SSRs are ideal for heating, lighting and motion control applications in industrial, medical, aerospace, rail and automotive applications.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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The HS series feature DIN rail and Panel mounted Heat Sinks
rated from 5.0 to 0.5 °C/watt, accepting 1, 2 or 3 industry
standard, single, dual or 3 phase Solid State Relays, and
corresponding SSR Assemblies rated from 10 to 82.5 Amps
Crydom, an operation of Custom Sensors and Technologies (CST) and global expert in Solid State Relay Technology, introduces a new line of Heat Sinks, Solid State Relay/Heat Sink Assemblies and Accessories. Designed with “state of the art” thermal analysis software tools, the Crydom HS series includes heat sinks accepting 1, 2 or 3 industry standard, single, dual or 3 phase SSRs. Designed for DIN rail or panel mounting, models are available with thermal impedance ratings from 5.0 to 0.5 degrees C per watt.

Combining proven Crydom Solid State Relays with the new HS series heat sinks allows Crydom to offer a variety of standard and adapted “ready to use” Solid State Relay/Heat Sink Assemblies. Ratings from 10 to 82.5 amps are available at either 280 or 600 VAC. Standard features include 3 to 32 VDC input control voltage, zero voltage turn on, and output RC snubber networks. Single, Dual and 3 phase SSR Assemblies are suitable for controlling most heating, motion or lighting loads.
Additional features of the HS series include RoHS compliance, UL/CSA/TUV or VDE approved CE compliant Solid State Relays, accessories including clear plastic touch safe SSR covers for single and 3 phase SSRs, thermal interface pads for single and 3 phase SSR packages, DIN rail mounting kits, and SSR hardware mounting kits.
Crydom also welcomes SSR and Heat Sink adaptations combining not only any standard Crydom Heat Sink and SSR products, but Customer Specific modifications to Heat Sinks, SSRs or Assemblies.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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Evolution Dual Output SSRs feature new input and output
termination options and higher output power ratings of up to
50 amps/ 660 VAC per channel for greater power density!
Crydom, an operation of Custom Sensors and Technologies (CST) and global expert in solid state relay technology, introduces a new line of AC output Dual Solid State Relays featuring new IP20 "touch safe" covers and LED input status indicators.
Evolving from Crydom's successful "D" and "H12" series Dual SSRs, the Evolution Duals offer an improved mechanical and thermal design providing higher capacity outputs and significantly increased power density. Screw termination suitable for rated load currents to 50 amps/ 660 VAC per channel is standard in either "SSR" or "Contactor" configurations. Each AC output channel features high power SCRs with high surge ratings and is available with either zero voltage or random turn on.

Four different input termination options (pin, locking connector, detachable barriers w/screws, and direct wire) are available with three different input voltage ratings including a wide range 4 to 32 VDC current regulated version. LED input status indicators for both channels are standard.
Evolution Dual SSRs are RoHS compliant, CE certified and have UL and cUL pending recognition. Optional clear IP20 touch safe covers are available allowing a clear view of the power lead terminations while providing touch safe operation. Crydom's new Evolution Duals are for use in a wide variety of applications including Heating, Lighting and Motion Control due to its industry standard footprint.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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New D1D and D2D series solid state relays add to Crydom's
already extensive offer for high-current DC applications
such as heater, lighting and motor control
Crydom's D1D and D2D series of FET output DC Solid State Relays formerly rated up to 40 amps at 100 VDC and 12 amps at 200 VDC, now includes new models rated at 60, 80 and 100 amps at 100 VDC, as well as 40 amps at 200 VDC. The new models which are offered in the industry standard "hockey puck" SSR package, adds to Crydom's present offer which includes the D06 rated to 100 amps at 60 VDC, D2D & D4D series rated to 12 amps and D5D models rated to 10 amps at 200, 400 and 500 VDC respectively.

The new D1D relays feature a low on-state resistance FET output capable of carrying 60, 80 or 100 amps when the SSR is mounted on an appropriately rated heat sink. Likewise, the new D2D40 features a similar FET design rated to 40 amps with appropriate heat sink. Control for these Crydom DC output SSRs is by a transformer isolated 3 to 32 VDC logic compatible input providing 2500 VAC input to output isolation. The outputs are diode protected and specified to operate up to 1 kHz.
Crydom DC output SSRs are ideal for heating and lighting control as well as motor control in commercial, industrial, medical, aerospace, rail and automotive applications.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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Crydom has combined solid state and mechanical switching
technologies to create a contactor with longer operational life
than standard EMR's in an industry standard package!
Crydom, global expert in solid state relay technology, introduces a new line of high power Hybrid Solid State Contactors for use in Heating and Lighting applications where Mercury Displacement Relays have previously been applied, and where life cycle constraints limit the use of Definite Purpose Contactors.
Mounting identically to a standard 3 phase DP (Definite Purpose) contactor, and featuring full load life cycle ratings of greater than 2 million operations, the new RHP line includes 3 phase contactor configurations rated at 120, 240, 280 or 600 VAC at 40 or 50 amp load ratings per phase at 65 degrees C ambient temperature. Control voltages of 24, 120 or 220 VAC, and unique logic compatible 5, 12 or 24 VDC input control options are offered. The RHP line is UL and cUL approved and CE certified.
The RHP line incorporates Crydom's proven Hybrid SSR technology that utilizes contactless Solid State Relay turn on and turn off performance, coupled with the very low on state power dissipation characteristics of contactors, thus eliminating the need for heat sinking. The higher power switching capabilities of the new RHP line means that in those applications where Mercury Displacement Relays are no longer welcome, the OEM manufacturer now has a cost effective alternative available. Similarly, in applications where contactor life cycles are a limiting or maintenance cost concern, the new Crydom RHP Contactor provides significantly longer operational life capability in an identical mounting package.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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Crydom Solid State Relays (SSRs) are widely used in applications where controlling different types of motors is necessary. They are used for AC motor speed control, motor reversing, starting motors, soft starting and soft stopping of motors, motor starting switches of both single phase and three phase motors.

Crydom SSRs are also used to control DC motors. DC relays can be used as a switch, for reversing DC motors, or using PWM (Pulse Width Modulation) for DC motor speed controls.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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Crydom Solid State Relays (SSRs) are utilized in numerous medical applications. Crydom SSRs are used to control motors in hospital beds, examination tables, and rehabilitation equipment. SSR’s are also widely used for heating controls in sterilization equipment, blood warming units, and incubators.

Since Crydom SSRs utilize silicon for switching loads and therefore have no contacts that arc, contact contamination and the danger of sparking are eliminated. Coupled with an epoxy-filled encapsulation, the Crydom SSR is resistant to steam and other sterilization techniques.
The recent introduction of the Crydom MC series of SSR/controllers is an all in one solution that includes both a controller and a Crydom SSR in one package to control temperature, phase control, or soft start, soft stop functions.
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Home Page: https://www.epreston.co.uk/epblog/
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October 25, 2007 - Crydom, an operation of Custom Sensors & Technologies (CST), announces the first solid state relays available on the market with UL approved short-circuit current ratings (SCCR). These relays facilitate industrial control panel builders' efforts to comply with the new article 409 from NEC and the latest version of UL508A, both request SCCR marking, by providing them with pre-approved ratings for SSR/fuse combination.

According to Dr. Oscar Montero, from the Crydom Global Technical Center, "Standard 5kA SCCR on power devices prevents panel builders from offering panels with higher ratings. Panels with a higher SCCR could be connected to electrical systems with different available currents bringing market advantages for panel builders. However, establishing a higher SCCR may represent significant challenges and additional costs for panel builders."
Crydom's approved ratings allow panel builders to establish the SCCR for the branch circuit where the relay is located without performing additional testing. The ratings can be added directly to the manufacturer's procedure. Hence, effectively reducing the time-to-market cycle for the panel and cost associated to compliance.
Crydom has obtained UL approval for SCCR by testing the combination SSR/Fuse under the "umbrella fuse" requirement allowing more flexibility to Crydom customers to mix and match SSR and fuses of different ratings.
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
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Big Power in a Small Package! Crydom PCB Mount Solid-State Relays Reduce Panel Space Requirements While Maintaining Power Capabilities
Crydom, an operation of Custom Sensors & Technologies (CST) and North American Leader in solid state relays, announces the most extensive line of standard and custom PCB mount power solid state relays available to the European and Asian markets. These relays offer ratings from 1 amp to 25 amps (forced air) at line voltages up to 660Vac., which makes them ideal for literally hundreds of commercial and industrial switching applications. Their compact design is also well suited for high-density PCB applications. Moreover, these relays contain no moving parts, which provides for silent operation and life expectancies at full-load current in excess of 50 times most electromechanical relays.

These compact solid state relays are ideal for use in numerous commercial & industrial applications, including: electromechanical relay replacement, pump control systems, gaming equipment, vending machines, security systems, medical equipment, solenoid control, packaging equipment, printing machines, and much more.
Versions are available with either a zero-crossing (resistive loads) or random turn-on (inductive / phase control loads) output. UL Recognition, CSA Certification, VDE Approval, and CE Compliance available on most models.
• Ratings up to 25A (forced air) @ 660V AC
• SCR output for heavy industrial or commercial loads (most versions)
• Available in standard in-line, mini in-line, or dual in-line packages
• Life expectancy in excess of 50x typical electro- mechanical relays at full-load current
• No moving parts eliminates all acoustical noise
• Not sensitive to magnetic fields
• Custom models available upon request
• RoHS Compliant
Enquiry Form: https://www.epreston.co.uk/contact/
Home Page: https://www.epreston.co.uk/epblog/
© E. Preston (Electrical) Ltd 2025.
UK distributor of electrical and electronic components.