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.

Variable Voltage

Variable voltage on a variac transformer provides a voltage adjustable source of alternating current electricity. The output voltage on a variac is the only thing that is intended to be variable voltage.

A variac transformer divides the voltage. It does this by dividing the impedance that is connected to the input voltage into two different parts. Just a fraction of the divided input impedance that is connected to the output will determine the output voltage. Thus, you get a variable voltage from the variac.

The variac has what we call a tap which is a conductive slider that will move along the length of the inductor. The inductor is the doughnut shape that is wrapped through the center of the hole and around the doughnut shape. The slider is an arm that is equipped with a carbon brush contact that rotates on an axle that is located on the doughnut shape. The winding wire has enamel insulation that is removed when the carbon brush touches the winding. This in turn makes the contact form a circuit through part of the winding.

The input current on a variac can be reduced by the turn ratios that are between the primary and the secondary winding. The secondary winding is the one that is used for the output variable voltage. Some variac voltages will allow 0 to input line voltage or 17 percent above the line voltage. The amount of variable voltage depends on the manufacturer of the variac. A lot of electronic service departments will use a variac to check out their equipment at low and high operating variable voltages. Engineering departments also test their equipment to make sure variable voltages are correct.

Contact your TEMCo specialist to find out more about variable voltage. They are the best qualified electronic manufacturers on the market today.  TEMCo has been in business since 1968 providing solutions and products to customers worldwide. Give them a call at 1-510-490-2187 or 1-800-613-2290.

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Variable Voltage
 

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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