Transformers Selection and Buying Guide from Marcus Transformers
April 14, 2026
What is a transformer and why is it used?
A transformer is a static piece of electrical equipment which transfers power from one voltage system to another by means of electromagnetic induction. At the basic level, all transformers consist of a metallic coil which carries the electric current, and a ferrous core which creates the magnetic field. The reason for using a transformer is to match the voltage of the load to the line voltage supplied by the utility. The dry type, air-cooled transformer contains no volatile nor inflammable materials, and depends only on the natural flow of air over its coils, and the radiation of heat through its enclosure for cooling. Therefore, it may be located right at the load and requires no special vault.
How can I select the best transformer for my application?
Transformers are available in a wide array of voltages. The capacity (volt-amps) dictates how much power a particular device can handle before overloading.
The application plays a pivotal role in selecting the correct transformer. Instances where the typical load may spike must be taken into consideration when selecting a particular transformer.
When do you need a custom transformer?
If your application requires a special design not available in stock, Marcus will be happy to accurately and professionally meet your requirements. They will design, manufacture and deliver your custom-made transformer within 7days of your request. For Special Orders: They make dry-type transformers up to and including 600 kVA, auto transformers up to 1000 kVA, and control transformers through 7500 VA. Call with your special requirements.
For Special Orders: Marcus makes dry-type transformers up to and including 600 kVA, auto transformers up to 1000 kVA, and control transformers through 7500 VA. Call with your special requirements.
Determine the Marcus transformer model number
You can form a Marcus model number by following this example or by following their guide.
Need technical help in choosing the right model?
Contact Marcus anytime during business hours.
