Automatic Air-Cooled Rectifier

The Corrpro® Automatic Series of custom air-cooled rectifiers combines top quality components and manufacturing methods with a wide variety of features and available options, resulting in an industry-leading solution for cathodic protection.

Available modes of operation with this series are constant current or constant potential control with voltage limiting. The AC input supply is isolated by a step-down transformer before being applied to a fully controlled, SCR, full-wave bridge assembly. This controlled and rectified voltage is filtered by a choke and capacitor combination (optional) to yield a low ripple DC output. The low ripple has the advantages of increased efficiency, no communication interference and more precise control of the output.

Rectifiers are constructed in natural convection, air-cooled, rugged steel enclosures rated Type 3R or, optionally, Type 4 or 4X. Enclosures are typically finished with a white, fusion-bond, polyester powder paint.

The Corrpro® Automatic Series of rectifiers provides the best choice for automatic control of your cathodic protection current & potential requirements.

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  • Slide out chassis with easy access for field servicing
  • Full-wave silicon controlled rectification (SCR)
  • Constant-current control mode with regulation to within 2 percent of full output rating
  • Constant-potential control mode maintains structure potential to within 50 mV of set-point
  • High energy AC input surge protection
  • High energy DC output surge protection
  • Secondary AC surge protection
  • Separate continuously reading 3.5” DC meters
  • Transformer constructed to Class “H” (180°C/356°F) temperature requirements with a minimum efficiency of 95 percent
  • All brass/copper hardware finished in electroless nickel plate for superior corrosion prevention
  • Wall or pole mounting
  • One-year warranty against defective components, and faulty workmanship from date of purchase 
  • Full complement of options to tailor the rectifier to the specific installation requirements
  • Optional floor stands
  • Optional 3-door enclosure available
  • Single phase inputs: 115, 115/230, 230, 230/460, 460 & 600 VAC., 60 Hz (50Hz optional)
  • Three phase inputs: 208, 230, 480, & 600 VAC., 60 Cycle (50 Hz. optional)
  • Potential sensing of up to (2) reference cells (more than two reference cells can be added as an option)
  • Magnetic trip input circuit breakers and secondary fuses for full overload & short circuit protection
  • Optional 25-steps of tap link bar adjustment
  • Output voltage range from 8 to 100 volts DC
  • Output current range from 4 to 120 amperes DC
  • Special output or input ratings available on request
  • Metering: 2 percent meters, temperature compensated
  • Cooling by natural air convection
  • Operating ambient: -40° to +45°C (-40° to 113°F)
  • Cabinet rated Type 3R; constructed from 12 or 14 Ga. mill galvanized steel, finished in 3-5 mils, fusion bond polyester powder paint, white.
    Stainless steel hardware
  • CNC cut, fully engraved front panel, or lamicoid labels

Corrpro U.S. Materials

11616 W 59th Street
Sand Springs, OK 74063

Ph: 1.866.CORRPRO
Fax: 713.460.6060


Corrpro Canada Materials & Corrpower Manufacturing

10848 – 214 Street N.W.
Edmonton, Alberta  T5S 2A7
Phone: 780.447.4565


7000 A Hollister, Suite 300
Houston, TX 77040

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