Special Assemblies

Cougar makes a complete lie of High Voltages X- Ray Board and Special Control boards for custom applications.

X- Ray Boards up to 150 KV 220 ma in 55 deg C. oil
High Voltage Board 25 KV up to 3 amps
High Voltage and Control Boards built to Customer specification.


  • Voltages: Typically 1KV to 50,000 KV
  • Currents: Typically 1 ma to 5 amps
  • Standard and Fast Recovery

Higher Voltages and Currents available with special design

  • Packages from miniature diodes to Power blocks
  • Terminations: Axial Lead, Screws, Terminals, Fuse caps and Inserts
  • Circuits: Halfwave, Doublers, Center Taps, Single Phase Full Wave Bridges, Three Phase Full Wave Bridges.

Special Assemblies: Give us your requirements and we will help you find the most economical solution to your problem.


  • Voltages up to 50 KV
  • Plug in Replacements for vacuum tube and gas tube rectifiers.
  • Compact rugged design for severe industrial and military applications.
  • No Filament therefor instant operation and no bulky filament transformer.
  • Reduced power dissipation.
  • Higher operating efficiency and cooler operation.

Assemblies can be made from standard products that are stock items. By adding a heat sing to a diode or power module, units can be rated at much higher currents. Fans can also be added to dissipate the heat absorbed by the heat sink which can farther increase the current rating of a device.

  • Special assemblies can be provided which include the rectifiers, heat sink, fan, and circuit protection devices.
  • Give us your requirements and let us help you find the right Assembly.

If you have any question, don't hesitate to contact us:

Cougar Electronics Corp. | 10 Lyman Street, New Haven, CT 06511 | Phone: (203) 562-6545 Fax: (203) 562-6748

Special Assemblies

The technology

Selenium rectifiers and suppressors are still used in the industry for their strong reliablity. This technology has been mainly replaced by silicon diodes, providing a better efficiency and lower voltage drop. Selenium components are very interesting for their reliability. Those components have the ability to recover after surge failure, which make them excellent for security applications. COUGAR ELECTRONICS has been one of the leading company in the 50's. We are the last firm still manufacturing parts made in USA thanks to our CT factory.

Elevator industry, Military and power generation

Despite most of our business is now focused on up to date semionductors like silicon diode, thysirtors, IGBT and SiC, our manufacturing department is serving elevator industry (otis, schindler, kone, thyssen krupp). We also serve specific fields like military or power generation application .

Service and Fast delivery

Our excellence in organisation, allow us to serve after-sales service with exceptional fast deliveries :
  • same day shipping
  • next day shipping

Looking for a part, call us !

If you look for a specific part number, or even if you do not have part number. Do not hesitate to call us. We build and design any type of selenium rectifier or selenium suppressor. Do not give up, thinking these components are impossible to find. We are here to help ! [caption id="attachment_2376" align="alignnone" width="282"]selenium rectifier selenium rectifier[/caption] [caption id="attachment_2370" align="alignnone" width="297"]Selenium7 Rectifier 3 phases[/caption] [caption id="attachment_2369" align="alignnone" width="210"]Selenium Suppressor Surge Suppressor[/caption]

Troubleshooting a selenium rectifier or suppressor

Our customer service will be happy to help you to determine what's the best solution.

Find parameters for rectifiers :

  • Voltages: Standard Voltages per cell up to 36 v rms. The voltage rating is determined by the number of cells in series
  • Current: Ratings are determined by the size of the cell or the number of cells in parallel. The circuit configuration and the type of cooling are also important factor to consider.
  • Circuits: Half wave, Doublers, Center Taps, Full Wave Bridges, single and three phase.

Find parameters for suppressors :

  • Ratings: Determined by the cell size and number of cells in a series (similar to rectifiers above).
  • Suppressors are also rated by the voltage clamping factor and the amount of reverse energy they can absorb (in joules).

More information about our product

[embed]https://cougarelectronics.com/cougar-electronics/power-conversion-components/selenium-rectifier-suppressor/#[/embed] https://en.wikipedia.org/wiki/Selenium_rectifier