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: 480VAC ±10%
INPUT FREQUENCY: 60 Hz
MAXIMUM POWER: 250 (VA) for 480V Applications
WARRANTY: 5 Years
 
PRODUCT FEATURES
• Non-Isolated Autotransformer
• 5 Year Limited Warranty
• For Use with LED, T5, T8, CFL, or Electronic HID Ballast
Operating at 277V Input Voltage
• Insulation Rating: 105oC Class A
• UL and cUL 5085 Approved
• Thermally Protected
• No Load Power Consumption < 7W
• 100oC/212oF Maximum Case Temperature
• 50oC/122oF Maximum Ambient Temperature