Product Catalog

Automatic Oil-Cooled Rectifier

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The Corrpro Automatic Series of Oil-Cooled Rectifiers combine top quality components and manufacturing methods, with a wide variety of features and available options, resulting in an industry leader 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 stepdown 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, oil-cooled, rugged galvanized steel enclosures rated NEMA4 or, optionally hot dipped, NEMA 4X. Enclosures are typically finished with a white, fusion bond, polyester powder paint. The Corrpro Automatic Series of rectifiers provide the best choice for automatic control of your cathodic protection current and potential requirements.

  • Lift out chassis permits easy access for field servicing
  • Full-wave silicon controlled rectification (SCR)
  • Constant-current control mode with regulation to within 2% of full output rating
  • Constant-potential control mode maintains structure potential to within 50mV 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%
  • All brass/copper hardware finished in electroless nickel plate for superior corrosion prevention
  • Floor or pad mounting
  • One year warranty, from date of purchase against defective components, and faulty workmanship
  • Full complement of options to tailor the rectifier to the specific installation requirements

  • Single phase inputs: 115, 115/230, 230, 230/460, 460, and 600 VAC., 60 Cycle (50 Hz. optional)
  • Three phase inputs: 208, 230, 480, and 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 and 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 160 amperes DC
  • Special output or input ratings available on request
  • Metering: 2% meters, temperature compensated
  • Cooling by natural air convection
  • Operating ambient: -40° to +45°C (-40° to 113°F)
  • Cabinet rated NEMA 4; constructed from 12 or 14 gauge 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
  • CSA certified under file number LR-45382