Variac Transformer Home                          Resources and information on variac transformers are listed. Learn about the different applications and what a variac transformer can do.

3 Phase Variac Transformer                         A 3 phase variac transformer will have 3 windings that are connected in a sequence that will match the incoming power. This will transform the power companies voltage to the level that is needed. 

Variac Transformer Amps                                   is also called current as it is the amount of electric energy that is flowing through the variac transformer. The amps is the amount of electricity that is pulled from the voltage in the line.

Variable Voltage                Learn how to adjust output voltage from 0 to 117 percent of the units input voltage. A variac transformer would be the way to go. 

Variac Wiring                     The inductor on a variac transformer is shaped like a doughnut with wire that is wrapped through the center hole. Due to the resistance of the winding wire, heating can sometimes be present.  
 

Single Phase Variac Transformer                       This type of variac transformer is mainly used on lighting and heating loads. They can either be air cooled or oil cooled.
 

Isolation/Variac Combination                     An isolation/variac combination type of transformer will isolate sensitive equipment from electrical noise and interference from the AC power line. It is used quite often in testing functions.  

Variac Auto Transformer                       This type of transformer will either act like a step-up or a step-down transformer. A variac auto transformer will not provide isolation from any line current.

3 Phase Variac Transformer

An efficient way of changing voltage is with a variac transformer. The amount of voltage that is being changed will depend on the type of model that is being used such as a 3 phase variac transformer.

The 3 phase variac transformer is considerably larger than a single phase variac. They are available up to 480 volts at over 300 Amps. The 3 phase variac transformer can be a two gang open delta configuration which is for controlling the voltage of delta three phase voltage source. A three gang wye configuration is also available which controls the three phase wye voltages. If your system has a common neutral or ground between the source and the load, when using a gang unit, the neutral or the ground should be connected to the common terminals of the 3 phase variac transformer assembly. If the system doesn't have a neutral, the load should be balanced or the 3 phase variac transformer could be damaged. It is highly recommended to place a fuse in each phase that is between the 3 phase variac transformer and your load.

When you want to achieve a wide range of control of the voltage and the current with a 3 phase variac transformer, the following connections can be used: 2, 4, 8, 10, 15, 20A, 20B, 32, 40, 50, 100, 150, 200 Amps. These units are manufactured in three phase configurations. Ratings that are above 200 Amps 3 phase variac transformer units are parallel which enhance the current capacity. The standard parallel combinations for 3 phase variac transformer current of 300 Amps is two units of 150 Amp. For 400 Amp it would be two units of 200 Amp 3 phase variac transformer that is connected in parallel.

The 3 phase variac transformer will often be seen as an open floor mounting type or can be an enclosed type. Most of the 3 phase variac transformers are constructed as a toroidal which is a doughnut shaped transformer that has a magnet steel core. Enamel covered magnet wire is then tightly wound around the core. Each end of the winding is fastened and then all of the winding is lacquered which locks the winding to the core. A track is machined around the doughnut shape. Rotating around this track is a carbon brush which will bring the 3 phase variac transformer output voltage to the separate terminal. The variac transformers are then ganged or stacked on top of one another to form the 3 phase variac transformer.

A good company to start looking for a 3 phase variac transformer would be TEMCo. They have been in business since 1968 manufacturing and distributing a superior 3 phase variac transformer with excellent performance. TEMCo has a highly trained staff that will provide you with technical support and guide you during your purchase. All of their products are built to exceed customer expectations. Contact them at 1-510-490-2187 or 1-800-613-2290.

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3 Phase Variac Transformer
 

Variac Applications         Some of the most common applications for the variac transformer are listed and reviewed. They are mainly used in quality control testing.

TEMCo Variac Transformers                    TEMCo has been in business since 1968 supplying and manufacturing various brands and models of variac transformers. Quality, performance and reasonable prices is what you will find at TEMCo.

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