Keystone’s step down transformers provide a safe and reliable power conversion solution.

group of 3 step down transformers

Keystone’s step down transformers are ideal for powering down from a 480V or 347V system to a 277V system, rated up to 375W. Utilizing a precision wound core and coil integrated design, these auto transformers provide a safe and reliable solution for effective power conversion to use standard 277V or multi-voltage lighting ballasts. Keystone’s step down auto transformers are non-isolated, making them compact and lightweight compared to isolated transformers.

Product Features and Benefits

  • Non-isolated auto transformer
  • 5 year limited warranty
  • For use with electronic LED drivers and ballasts operating at 277V input voltage
  • Thermally protected
  • UL and cUL 5085 approved
5 Year Warranty

Tech Specs

The Keystone Difference

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Industry-leading warranty

U.S. based