Technical FAQs

Ask a Question

Difference between an encapsulated transformer (ex. 30T2F) and a ventilated transformer (ex. 30T3H)

An encapsulated transformer utilizes a 180?C insulation system, has a standard temperature rise of 115?C, and is standard in a NEMA 3R enclosure.
A ventilated transformer utilizes a 220?C insulation system, has a standard temperature rise of 150?C, and is standard in a NEMA 2 enclosure which can be made suitable for NEMA 3R applications with the installation of an appropriate weathershield kit.
Additionally, the encapsulated transformer`s core and coil is completely encased in a sand/resin material and the heat is dissipated through the enclosure. Ventilated transformers have an enclosure around a core and coild assembly with ventilation openings allowing airflow over the core/coil. Both transformers are considered to be type AA (cooled by ambient air.)



CTA-ID : 647
Was this helpful?
What can we do to improve the information ?