Description
277V Output Auto-Transformer for LED Drivers & Ballasts | 480V / 347V Input | Open Core Design
The Keystone KTAT-150-480-277-OC is a compact step down auto-transformer designed to convert 480V or 347V input power to a stable 277V output for LED drivers and lighting ballasts. Built with an open core metal housing, this non-isolated auto-transformer is ideal for commercial and industrial lighting systems where 277V operation is required from higher-voltage electrical services.
With a maximum capacity of 150VA and high operating efficiency, this Keystone auto-transformer supports reliable performance in new installations and retrofit applications. It is UL listed and engineered for long-term operation in demanding electrical environments.
Specifications
- Model: KTAT-150-480-277-OC
- Type: Step Down Auto-Transformer (Non-Isolated)
- Input Voltage: 480V / 347V AC ±10%
- Output Voltage: 277V AC
- Maximum Power: 150VA
- Frequency: 50/60 Hz
- Efficiency: 95% typical
- No Load Power Consumption: < 8W
- Sound Rating: A
- Withstand Voltage: Input to Output, 2000Vac
- Maximum Case Temperature: 105°C (221°F)
- Certifications: UL / cUL 5085
- Warranty: 5 Years
Physical Details
- Length: 2.76 inches
- Width: 2.32 inches
- Height: 1.93 inches
- Mounting Length: 2.17 inches
- Unit Weight: 1.95 lbs
- Case Material: Metal
Wiring
- Input Leads: 14 inches, UL 1316, 18 AWG (red, yellow, white)
- Output Leads: 14 inches, UL 1316, 18 AWG (black, blue, white)
- Compatible with 3-phase Wye or Delta power systems (see wiring diagram)
Downloads
Disclaimers
Non-Returnable Item Notice:
Due to the sensitive electronic nature of ballasts and the risk of improper installation, tampering, or programming, this item is non-returnable. Please confirm compatibility before purchasing. If your ballast is defective upon arrival or during the warranty period, it may be eligible for a manufacturer warranty replacement. For assistance selecting the correct ballast, please contact our support team.
