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R Series Transformers Breather


The failure or malfunction of many transformers or similar equipment can be directly attributed to the lack of proper control of the level of water vapor entering the equipment. It is essential, therefore, that a very low level of humidity is maintained in the airspace of the conservator tank to avoid deterioration in the insulating properties of the cooling medium.  Transformer Desiccant Breathers provide an economic and efficient means of controlling the level of moisture entering equipment during the change in volume of the cooling medium and/or airspace caused by temperature gradients.
All Transformer Desiccant Breathers (except Re-Actran) are filled with self-indicating silica gel. This desiccant is blue when active and turns pink when saturated. This allows a visible assessment of the condition of the desiccant. Various sizes and types of packs of this desiccant are available for recharging the desiccant containers.
Transformer Desiccant Breathers provide clear visibility of the desiccant charge through a clear, shatter-proof, UV stabilized polycarbonate cylinder or window, depending upon the size of the unit. Two-way, low pressure valves are fitted in the base of the breather to ensure that atmospheric air enters the desiccant charge when a negative pressure differential occurs within the equipment being protected.
The top pipe connector (3/4" female pipe thread) is also the filling and emptying plug.  The beaded self-indicating silica gel desiccant should be replaced once the color has changed from blue to pink, as indicated on the label attached to the breather.
Maximum torque on threads is 9 N•m (80 in. - lbs.)
Full installation and maintenance instructions are supplied with each "R" Series Transformer Desiccant Breather.




Desiccant Charge

Part Number


Max. Oil Contents

Overall Diameter

Overall Length (Dimension A)

Dimension B

1.32 bs. (0.60 kg)



396 gal. (1,500 liters)

4.25" (108 mm)

6.22" (158 mm)

4.33" (110 mm)

2.65 lbs. (1.20 kg)



793 gal. (3,000 liters)

4.25" (108 mm)

10.2" (260 mm)

8.3" (212 mm)

4.19 lbs. (1.90 kg)



1,255 gal. (4,750 liters)

4.25" (108 mm)

13.43" (343 mm)

11.59" (294 mm)










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