We offer Variac transformers (variable transformers)  with ratings from 120V to 600+ VAC single and three phase and fractional to 1000+ Amps.  Variac transformers are AC voltage controls that provide a variable AC voltage.  Their distortion free output  is ideal for sensitive electronic applications.  Variac transformers are available that boost the output voltage in excess of twice the input voltage.  Input frequencies to 2000 Hz can be accommodated on some models. 

Variac Selector assists you in the selection of the best variable transformer for your application.  This is usually the best place to start.

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 smaller 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 VARIAC® variable transformer ratings click continue.




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ISE, Inc.
10100 Royalton Rd.
Cleveland, OH  44133 USA
Tel: 440-237-3200 - Fax 440-237-1744
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