Midwest Current Transformer has been an industry leader in design and production of current transformer products for over 50 years. Our focus is to build quality products designed to meet your needs. You may choose from any of our standard products or we can design and build a custom solution specifically for your application.

Superior Goals and Higher Expectations

It is the goal of Midwest Current Transformer to maintain its position as a worldwide industry leader . . .

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Worldwide Leader

American Pride Made  in  the  U.S.A.

CT Series Current Transformer

CT Series Current Transformer

The CT Series offers a wide range of standard ratios to 1 amp and 5 amp secondary outputs.

Standard units are manufactured with 24 inch leads, 600 volt fiberglass insulation wrap and a protective polyurethane coating.

Screw terminals, high voltage insulation, mounting brackets and ratios to 0.1 amp are available. Please specify when placing your order.

RC Series Current Transformer

RC Series Current Transformer

The RC Series offers a wide range of standard ratios to 1 amp and 5 amp secondary outputs.

Standard units are manufactured with 24 inch leads and a round polycarbonate case.

Mounting brackets and ratios to 0.1 amp are available. Please specify when placing your order.

SC Series Current Transformer

SC Series Current Transformer

The SC Series offers a wide range of standard ratios to 1 amp and 5 amp secondary outputs.

Standard units are manufactured with brass screw terminals and a square polycarbonate case.

Lead wires instead of screw terminals and ratios to 0.1 amp are available. Please specify when placing your order.

Custom Current Transformer

Custom Current Transformer

Midwest Current Transformer offers you a wide range of current transformers. Should a standard unit not meet your specific application, our experienced staff will design a custom current transformer for you.

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Premier Current Transformer Manufacturing Company

As a premier leader among current transformer suppliers, Midwest Current Transformer has served customers requiring high quality current transformer products for more than five decades. Our targeted focus is the manufacture of standard and custom design current transformer solutions to meet the requirements of a wide range of applications.

Customized Current Transformer Design

We offer pre-made current transformers to serve the needs of various power applications. Our team is able to customize your order in order to help you achieve the optimum current transformer solution in terms of size, ratio, accuracy, multiple taps, contacts, mounting options, and burden rating.

Our Electrical Current Transformer Construction

At Midwest Current Transformer, we manufacture the majority of our current transformers from cold-rolled grain oriented electrical steel (CRGO). The CRGO steel comprising our current transformers is rolled into your required inner and outer diameter dimensions which permits precise dimensioning and tight construction between layers. As an iron-silicon alloy, CRGO electrical steel provides high permeability and low core loss that enables greater efficiency and cost-effectiveness of the current transformer.

Total Quality Management

Our approach consists of Total Quality Management protocol in which our employees, customers, and suppliers are valued as an integral part of our successful process. Our standard for success is error-free performance with the commitment to error prevention and getting-the-job-done-right-the-first-time mindset.

Through hands-on product inspection as part of an entire quality management system, we strive for perfection at every stage of the manufacturing process before your products leave our hands. We push toward continual quality improvement, adherence to safety standards, and personnel development through high-value training across all levels of our operations.

Contact Us

For more information about the superior current transformer products we offer at Midwest Current Transformer, call us today at 800.893.4047 or email sales@aenpi.com.

Professional Engineering & Investigation Services

Anderson Engineering & Investigations are professional engineers experienced in manufacturing engineering, product and process failure mode analysis, electrical, mechanical, and forensic engineering including fire investigation services.

When you need answers you can trust, Anderson Engineering & Investigations will provide you with timely, understandable results.

Lithium Ion Batteries: Cause or Victim?

Blaze Fire Investigation is now know as Anderson Engineering. (updated 6/28/17)

Lithium Ion batteries are ubiquitous in today's electronic environment. Everything from cell phones to hover-boards to electric vehicles run on Lithium Ion batteries. This type of battery is attractive to manufacturers because of its relatively high specific energy. This means there is more energy per unit of mass in a Lithium Ion battery than there is in other types of batteries. The high specific energy is great for packing a lot of power into a small package. But upon failure, that same energy can be released in a dangerous fashion. 

In that way, the Lithium Ion battery is not unlike other electrical failures. We know that electrical failure in an appliance or circuit can cause a fire. We also know that in a fire environment, the breakdown of insulation systems can cause an electrical failure on a circuit or appliance. During a fire investigation, an investigation team has to determine if the evidence of failure noted after the fire was a cause of the fire or a victim of the fire. 

Similarly, a Lithium Ion battery can fail and cause a fire or it can fail due to being attacked by a fire. 

There have been well documented failure modes of Lithium Ion batteries that result in a thermal run-away condition. The thermal run-away condition can result in a pressure build-up internal to the battery cell that is relieved by a venting with flame. The heat generated in the battery cell can ignite near-by combustible materials such as a plastic housing. Even more dangerous is the possibility of the battery cell contents being expelled under pressure causing the flaming battery to rocket across a room and ignite combustible materials. 

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What is hidden in that piece of char?

Blaze Fire Investigation is now know as Anderson Engineering. (updated 6/28/17)

Utilizing Radiography and Computerized Tomography as Tools for Non-Destructive Examinations

Many times the evidence left after a fire is unrecognizable and appliances that are made partially out of plastic have melted leaving only a pile of char.  However, most of the time, the metal components inside the appliance have remained intact and are just buried in charred plastic making them inaccessible for physical examination.  This causes a problem for the investigator because the components they need to exam are unavailable.  They risk causing damage to the artifact if they physically try to remove the components by breaking away the plastic.  That’s why our team of investigators are trained to utilize radiography (X-rays) and computerized tomography (CT scans) as a non-destructive examination tool.

Utilizing X-rays as a non-destructive tool has been used in fire investigation for years.  X-rays are a great way to see components on a two dimensional image and can be very useful in determining switch positions, fuse conditions, and many other things. A CT scan is an x-ray procedure that combines many X-ray images together, with the aid of a computer, to produce a three-dimensional image.  Below are examples of images from a CT scan of a surge protector.  As you can see, these images are incredibly detailed.


These images give our investigators the ability to see inside of an object without cutting or destroying the evidence and therefore preserving the evidence.   You can see the metal oxide varistors (MOVs) and switch contacts in the images above.  These tools are invaluable when determining the origin and cause of a fire. Contact Blaze Fire Investigation to assign a project or to learn more about our fire investigation and forensic engineering services.

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Using Drip Loops Could Save Your Fish and Your Home

Blaze Fire Investigation is now know as Anderson Engineering. (updated 6/28/17)

Saltwater aquariums are fascinating and beautiful.  Having a little piece of the ocean inside your home has been attracting hobbyist for years.   However, not all hobbyists are aware of the dangers and risks that are associated with keeping a saltwater aquarium.

It was the start of a beautiful day in Memphis, TN until the owners of a 90 gallon saltwater aquarium woke up to the smoke alarm sounding in their home.  They ran into the living room and saw flames shooting up behind their aquarium.  They immediately grabbed the phone, called 9-1-1 and ran out of the house.  The fire department came and extinguished the fire. Unfortunately, the glass tank broke during the course of the fire and all the aquarium inhabitants were lost.

Our team of experts examined and photographed the fire scene and collected all of the aquarium equipment in the home. The aquarium equipment consisted of a water pump, heater, protein skimmer and two fluorescent light fixtures.  All of this equipment was plugged into a relocatable power tap that was located on the floor behind the aquarium.  A detailed examination of all of the aquarium equipment showed the most severe damage was located at the power tap.  The power tap’s plastic housing was melted and charred and sections of the hot and neutral busses were visible.  See photographs below.

The hot and neutral busses showed evidence of melting and a short section of both of the buses was melted away.  Analysis showed that arcing occurred between the line and neutral busses in the power tap.  These busses are normally separated by an air gap and insulating plastic material.  In order for an arcing event to occur internal to the power tap, a current path must be established across the insulating materials.  Arcing across an insulating material is known as arc tracking and is commonly due to contamination on the insulating surfaces.  In this case the contamination was caused by the saltwater from the aquarium. 

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How We Manage a Joint Fire Investigation Scene

Blaze Fire Investigation is now know as Anderson Engineering. (updated 6/28/17)

Fire investigation scene management

Managing a joint fire investigation scene in a methodical, organized manner keeps costs low for our clients. Our management creates efficiencies while getting the job done. Our first step is to determine if a joint investigation is needed. As we begin to examine the scene, we look for origin and cause. We rule out items that show zero evidence of involvement. This assures that we have the correct representation at the joint investigation. When the appropriate parties have been notified, it's our job to manage the scene so that everyone can have access to the information and evidence. This results in decisions that are made accurately and quickly.

Joint scene preparation

When artifact representatives arrive for the joint investigation, we provide them with a packet that contains the fire department incident report, a diagram of the scene, a protocol of how the scene will be excavated and how artifacts will be collected, any lab reports, and a synopsis of events prior, during and after the fire. Taking the time to gather this information efficiently answers questions that routinely arise in the investigation process and assures that everyone has the same baseline knowledge of the scene.

The scene itself is maintained and protected so that it is in the condition that it was when the fire department released the scene. If the fire department made any changes in the course of their own investigation, that is noted. Safety concerns are placarded as well as "Do Not Enter" signage in the area of origin. Barricade tape is placed around the area of origin. Plywood may be placed over door openings to limit access. We work with the restoration contractor to create a safe work place.

During the investigation

The packet that the representatives receive as they arrive on the scene includes a plan for how the investigation will be conducted. It includes steps for digging out debris, collecting artifacts and reconstructing the area of origin. The Blaze Fire investigator managing the scene goes over the plan and responds to any questions or requests from the participants, always mindful that the objective is an unbiased investigation. Shovels, ladders, lights, power equipment and any other tools that might be needed at the scene are ready. If part of a building needs to be removed, heavy machinery will be on hand. Warming equipment to thaw frozen debris and provide a workable air temperature is provided.

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