Non-Ventilated General Purpose Transformers

Non-ventilated enclosures are used in environments where large quantities of dust, airborne contaminants, metal particles, or moisture make ventilated transformers impractical. These transformers are also used when water spray from any direction is possible.

The 150 rise transformers are built using 220 class insulated core and coil assemblies similar to ventilated units. However, the core and conductors are oversized to maintain proper temperature rise with the limited cooling capacity of a non-ventilated enclosure. Therefore non-ventilated transformers are larger and heavier than the same kVA and voltage ventilated equivalent.

The 115 rise epoxy-resin encapsulated transformers listed below are furnished non-ventilated at standard price.

Non-ventilated enclosures meet protection code IP55 (dust and jetting water protection) per standard IEC-529. While not listed to a specific NEMA standard, they are suitable for indoor or outdoor use.