Etlin-Daniels SDT-347/277-250VAE 480V/347V to 277V Step-Down Auto-transformers are designed specifically for lighting applications to step down 480V power to 277V single-phase power in conjunction with 277V or universal voltage (120-277V). These loads generate transients when started or switched which can damage electronic ballasts and drivers. The SDT-347/277-250VAE helps absorb transients before reaching electronic ballasts as well as stepping down the voltage to 277V where most electronic ballasts operate. Etlin-Daniels SDT-347/277-250VAE 480V/347V to 277V Step-Down Auto-transformers provide a easy, flexible and most importantly a reliable solution for use with electronic energy saving ballasts. Lower field cost on replacements/ lower cost in multi-ballast applications.

Etlin-Daniels SDT-347/277-250VAE 480V/347V to 277V Step-Down Auto-transformers are designed specifically for lighting applications to step down 480V power to 277V single-phase power in conjunction with 277V or universal voltage (120-277V). These loads generate transients when started or switched which can damage electronic ballasts and drivers. The SDT-347/277-250VAE helps absorb transients before reaching electronic ballasts as well as stepping down the voltage to 277V where most electronic ballasts operate. Etlin-Daniels SDT-347/277-250VAE 480V/347V to 277V Step-Down Auto-transformers provide a easy, flexible and most importantly a reliable solution for use with electronic energy saving ballasts. Lower field cost on replacements/ lower cost in multi-ballast applications.