SCR Contactors for Resistance Welding


Darrah Electric Company is “The Company” to call for resistance welding SCR Contactors. Darrah supplies contactors ranging in size from 5 KVA air cooled through 1500 KVA liquid cooled models. Darrah Electric Company maintains the largest inventories of resistance welding SCR Contactors in the country.

We provide:

  • Direct Water Cooled Contactors
  • Indirect Water Cooled Contactors
  • Water and Air Cooled Isolated SCR Modules
  • SCR Contactor Designed for Single and Three Phase Controls
Darrah offers solid state ignitron tube replacements. Our state of the art replacements are easy to install, more efficient, and less costly than ignitron tubes. Replacements are available in air and water cooled designs for A through Super E ignitron sizes.

Darrah stocks a full line of related accessories, such as R/C snubbers, thermostats, voltage suppressors, SCR thyristors, and IGBT’s. We offer technical support in selection, application, installation, testing, and repairing.


More Information

Direct Water CooledDirect Water Cooled
  • Highest resistance welding ratings available
  • 900 through 6526 Amps at 50% duty cycle, 5144 Amps continuous
  • SCR voltage ratings to 4200 VRRM
  • Common mounting and bus bar locations through entire product line
  • All copper nickel plated cooling blocks
  • Popular and economical styles
HS-6 DesignHS-6 Design
  • Direct water cooled popular design
  • Available with 3/8” or ½” water hose connections
  • 1200 and 1800 Amp welding ratings
Automotive Style SCR ContactorsAutomotive Style SCR Contactors
  • Direct water cooled hose designs
  • Popular in automotive welding controls, frequency converters, seam and flash butt welding controls
  • 2600 Volt ratings
  • Work horse for frequency converter, seam, and flash butt welding applications
Tri-Pack AssembliesTri-Pack Assemblies
  • Common cooling block for three independent SCR contactors
  • Reduce plumbing for cascade controls
  • Engineering choice for three phase controls
Indirect Water CooledIndirect Water Cooled
  • Isolated line voltage from water cooling
  • Open or integral water cooled SCR module styles
  • Increased current ratings
  • Eliminates condensation issue
Solid State Ignitron Tube ReplacementsSolid State Ignitron Tube Replacements
  • No more mercury or ignitron tubes
  • Drop in, state of the art, solid state replacement
  • One Darrah conversion replaces two tubes
  • Available in water cooled or air cooled designs
  • High efficiency, lower power los
Solid State Mechanical Contactor ReplacementsSolid State Mechanical Contactor Replacements
  • No more worn out contacts
  • Solid state air cooled replacements
AccessoriesAccessories
  • Encapsulated thermostats
  • R/C snubbers
  • Voltage suppressors (MOV’s)
  • Replacement SCR’s and diodes
  • Replacement cooling blocks, hoses, clamps, testers, and instructions

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