Products & Services



IE specializes in designing and manufacturing dry-type power transformers for the mining, industrial, and utility markets. With over twenty years of experience in electrical equipment design, and our long standing commitment to quality and customer service, you can be sure that every IE transformer meets the most stringent requirements for performance and reliability.

We do not build a “me-too” product. Every part of our transformer is designed to set the industry standard. Some of these include:
  • Step-lap miter cores – standard on every unit.  Along with higher grades of core steel and the multi-step-lap miter core construction, IE can reduce the core losses as much as 50% and the sound level as much as 9 dB.  This reduction in losses saves you money on your power bill every day.  Let IE do an annual payback analysis for you.
  • Vacuum Pressure Impregnated (VPI) coils – standard on every unit
  • Best materials – no matter the customer specs for temperature rise, IE uses only Class H, 220  C insulation (including Nomex  Aramid paper) to withstand high temperature rises for longer transformer life.
  • State of the art testing equipment – our Phenix test bench allows us to energize and test every transformer we sell.
Click here to download the product brochure.



  • 120 volt – 25KV
  • 5 KVA – 3333 KVA, single phase transformers
  • 50 KVA – 7500 KVA, three-phase transformers
  • 10 KV - 110 KV Basic Impulse Levels (BIL)
  • Current limiting reactors
  • Neutral deriving zigzag transformers

Standard Transformers

Dimensions and weight are approximate.  Transformers above are rated for underground mining service.  Transformers for other applications also available. Please contact IE for other transformer types.  

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Intermountain Electronics uses state-of-the-art winding machines equipped with variable air actuated tension for each spool of wire and secondary clamp tensioning. This equipment, along with using only copper as our standard material, produces a tighter coil which ensures maximum durability against short circuit stress.
As a standard procedure, we use only Class H, 220˚C insulation (including Nomex® Aramid paper) to withstand high temperature rises for longer transformer life.

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Varnish Impregnation System

To provide maximum protection for the transformers we build, Intermountain Electronics uses a two-step process as our standard procedure. First, using an environmentally friendly, solvent-free varnish, we vacuum impregnate every coil we build.

Once the coils have been vacuum impregnated, we dip and bake the entire transformer assembly. The advantages of our Vacuum Pressure Impregnation (VPI) process are: 

  • Superior penetration of varnish for maximum protection against moisture and contaminants
  • Improved heat dissipation to help eliminate hot spots and extend transformer life
  • Eliminates air pockets which can occur during typical dip and bake processes thus making the transformer less susceptible to tracking and corona issues
  • Extends transformer life by helping to protect against coil movement

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Core Steel

As a leader in transformer design and construction, we have invested in the best transformer core cutting technology in the industry – a German built, GEORG core cutting machine. It allows us to build a a step-lap, mitre core at no extra cost. 
Additionally, our GEORG core cutting machine results in a precision, machine stacked core, resulting in even tighter tolerances and finish. Since January 1, 2010, the Department of Energy (DOE) has mandated that specific dry-type transformers meet a certain efficiency level.  When applicable, IE can meet or exceed those requirements.

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Quality Assurance

Using our state-of-the-art testing equipment, Intermountain Electronics tests every transformer to satisfy the standards required by ANSI C57.12.01
(General Requirements for Dry Type Transformers).
Once programmed, our testing equipment eliminates human error and ensures the highest quality transformers that meet all IEEE, ANSI, and NEMA standards.

Once testing is completed, a computer-generated report is printed and a copy is given to the customer for their records.

IE also impulse tests all new transformer designs.  This impulse test measures the effectiveness and the integrity of the insulation system inside of the transformer coils and the ground clearances inside and outside of the coils to assure maximum protection against lightning and switching surges and a longer lasting transformer.

Intermountain Electronics also offers Remote Viewing for the testing of individual transformers. This time and cost saving capability allows the customer to witness their transformer being tested from the comfort of their office.

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Other Features, Benefits, and Services

  • Low profile 5-leg core and single phase transformers allow for higher KVA transformers in low ceiling environments
  • Emergency replacement or fast turn-around repairs reduce down time
  • Rental units available for down times or during repair of customer’s own transformer