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CSL HB Multiple Desiccant Transformer Breather Units

An ideal solution for protecting high-oil-volume equipment that produces more harmful moisture than smaller machinery.


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The design of the Hawke Desiccant Breather in its single unit form (i.e. HB2) has been limited to weights and dimensions which enable easy handling during initial installation and subsequent charge replacement. However, parallel arrangements are available for those situations where the oil volume of the transformer requires larger volumes of Desiccant gel. Where Breather charges are operated in parallel, it is essential that only one oil valve is used, this maintains a balanced air flow through each branch of the multiple arrangement.

  • The pipework for the connection of two and three breathers in parallel are standard fittings.
  • All interconnecting pipework is polythene coated to provide protection where installations are located outdoors.
  • Multiple Breather Units Types available are HB55, HB66, HB77 & HB777.
Ref No. Transformer Total Oil
Content Litres
Maximum weight of
Desiccant Kg.
Length of Assembly
Dimension “A”
Diameter of Charge
Length of Charge
HB55 From 33420 up to 44550 17.00 850 215 430
HB66 From 44550 up to 66840 24.00 1000 215 600
HB77 From 66840 up to 89120 30.00 1150 215 730
HB777 From 89120 up to 133680 45.00 1150 215 730
All dimensions in millimetres (approximate).

Hawke HB Series Breather Datasheet

Hawke HB Series Breather Assembly Instructions

Download CSL Breather Catalogue

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