Dual Column Breather

Big Step Forward in Regenerating Breather Technology


The Dual Column Breather (DCB) is the first breather that does not need to isolate itself from the transformer or LTC during its regeneration cycle. With its dual column design, when one side needs to regenerate, the other side takes over, using a recharged column of silica to provide dry air to the transformer or load tap changer (LTC). This design also allows you to specify the DCB for multiple applications, from the smallest LTCs to the largest transformers — a single specification for your entire system!

In addition to the improved design, we added
several features to our latest product:

  • NEW! Optional communication and monitoring capabilities
  • Aluminum and stainless steel construction
  • Borosilicate glass globes
  • Super bright LED indicators
  • Time and humidity based regeneration
  • Available DIN flange mounting
  • Latching solenoid for improved reliability
  • Standard alarm contacts for remote alerts
  • Conduit wiring that doesn’t require an adapter box
  • Arctic model for environments –50ºC to –80ºC

All of our breathers ship with an environmentally-friendly and enhanced performance clear silica gel.


During regeneration, a heating element located inside the breather assembly heats the partially saturated silica gel, driving moisture out. This moisture condenses on the borosilicate glass, forming free water, which then flows down the glass and out the bottom vent.


For breather specifications, LED indicator colors and meanings as well as part number configurations for our DCBs, please download our Dual Column Breather brochure. You can also contact your sales representative or fill out our Waukesha® Components Request Form.