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Variac Adjustable Autotransformer
 Variac Selection Guide
What is a Variac
Variac Applications
How to Select a Variac
Variac General Specifications
Get More Out of your Variac
What is a Variac
Complete Variac Datasheets and Catalog Information(.PDF 12 MB)
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Variac Selection Guide |
| Variac Portable Enclosed Models |
Single Phase, 120 V, 50-60 Hz
Single Phase, 240 V, 50-60 Hz |
| Variac Open Models |
Single Phase, 120 V, 50-60 Hz
Single Phase, 240 V, 50-60 Hz
Single Phase, 480 V, 50-60 Hz
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| Variac Three Phase Gang Units |
Three Phase, 208 V, 60 Hz
Three Phase, 208-240 V, 50-60 Hz
Three Phase, 480 V, 50-60 Hz |
| Variac Motor Driven Units |
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| Variac 400 Hz M-Series |
Single Phase, 120 V, 400 Hz
Three Phase, 120 V, 400 Hz
Three Phase, 120V-208V-240V, 400 Hz |
| Variac W50-P1 Paralleling Choke |
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| Variac Replacement Brushes |
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The Variac® autotransformer is an efficient, troublefree device for controlling ac voltage and any other quantities that derive from ac voltage: heat output, light intensity, motor speed, and the outputs of various power supplies. The name Variac comes from the unit's function - "vary ac" - and is General Radio's registered name for its continuously adjustable autotransformer.
Unlike most transformers, the Variac has a transformation ratio that can be smoothly and continuously changed so the output of the unit can be controlled from zero to line voltage.or even higher. Because it is a transformer, the Variac is
- efficient transforms power more efficiently than rheostats
- durable because it runs cool
- overload-able withstands 1000% short-term overloads
- independent of load size or power factor voltage to the load changes little from full load to none
- quiet adds no noise or distortion to the line
- reliable exclusive Duratrak® contact surface prevents injurious high-temperature oxidation and resultant brush-track deterioration
In addition, the Variac is
- easy to install. All mounting hardware is included; wiring diagram is on the terminal plate; conduit knockouts are included on all enclosed models.
- available in hundreds of standard versions to satisfy line frequency, voltage, and phase requirements, load size, mounting demands (including portable and metered models). They can be supplied with motor drives, ball bearings, and in ganged assemblies to increase basic line-voltage and load-current ratings.
- assured safe by Underwriters' Laboratory listing and Canadian Standards approval of many models
- available in militarized models specifically designed for 400-Hz operation
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