Variac Variable Transformers


Our VARIAC® transformers with ratings from 120V to 1000+ VAC have been Proudly Manufactured in the USA for over 70 Years.

Single phase and Three phase Variable Transformer versions with load ratings from fractional to 1000+ Amps are available. 

Variac® transformers are Variable AC Power Supplies that provide adjustable AC voltage.  Their distortion free output is ideal for sensitive electronic applications, testing devices for agency approval, and numerous other applications where a variable AC voltage is required.  Our VARIAC transformers are available that boost the output voltage in excess of twice the input voltage.  Input frequencies 50Hz, 60Hz and other fequencies up to 2000 Hz can be accommodated on some standard and custom models.  


VARIAC Variable Transformer Selector


Other Resources:

Variac Drawings provides detailed mechanical and electrical drawings of our products when our part number is known.

Variac Literature

Variac Cross Reference identifies suitable replacements for older and obsolete variable transformers.

ISE Web Store provides pricing for some of our more popular VARIAC transformers.


Various Variac configurations are available to meet your application requirements. Open, enclosed, portable and metered test sets are available.

Many models are direct replacements for other brands such as Superior, Powerstat Ohmite & Variac. Contact ISE with the model number for any brand of transformer for an exact replacement often at less cost. Our product range includes a full line of variacs (variable transformers), voltage regulators, power conditioners, SCR power controls, instrumentation and sensing products.

For a complete listing of standard VARIAC® variable transformer ratings click continue.




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10100 Royalton Rd.
Cleveland, OH  44133 USA
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