Keystone’s 480V to 277V Step-Down Auto-Transformers are designed to step down 480V to 277V single-phase power. These transformers enable consumers to utilize common universal voltage (120-277V) electronic ballasts in applications where the main facility power is 480V.
 
INPUT VOLTAGE: 480 or 347VAC ±10%
INPUT FREQUENCY: 50/60 Hz
MAXIMUM POWER: 375 (VA) for 480V Applications
375 (VA) for 347V Applications
WARRANTY: 5 Years
 
PRODUCT FEATURES
Non-Isolated Autotransformer
• Sound Rated A
• 5 Year Limited Warranty
• For Use with T5, T8, CFL, or Electronic HID Ballast Operating
at 277V Input Voltage
• Insulation Rating: 105oC Class A
• UL and cUL 5085 Approved
• Thermally Protected