Product Overview
GE 66954 Halogen Transformer - 75W Electronic Transformer. 12V. 277V Input. Input 277V / Output 11.5V, Trailing Edge Dimmable
The GE 66954 Halogen Transformer is a GE Lightech™ low-voltage electronic step-down transformer. It is a 75W Electronic Transformer. 12V. 277V Input. unit, converting 277V AC input to 11.5V output across a 35-75W load range, with Trailing Edge dimming compatibility.
This transformer should be selected by matching the GE order code, input voltage, output wattage range, lead exit type, and case dimensions to the existing transformer or fixture being replaced.
Wattage 35-75W Output Range | Input 277V AC Input | Output 11.5V AC Output | Dimming Trailing Edge Compatible | Lead Exit Side Wire Exit |
Product Overview
GE Lightech™ Low-Voltage Halogen Electronic Transformers combine the engineering of Lightech, now part of GE, with GE's manufacturing and support. They use an Auto-Thermal Regulation process that proportionally dims output voltage above 90°C, a self-preserving 125°C thermal cut-off, and field-effect transistors for higher efficiency, smaller size, and longer life than transformers built with bipolar transistors, running up to 95% efficient at full load.
Technical Specifications
| Brand | GE Lightech |
| GE Order Code | 66954 |
| Description | 75W Electronic Transformer. 12V. 277V Input. |
| Output Type | AC |
| Input Voltage | 277V |
| Input Frequency | 50-60 Hz |
| Power Factor Correction | 0.95 |
| Output Voltage | 11.5V |
| Output Wattage Range | 35-75W |
| Dimmability | Trailing Edge |
| Ambient Temperature | 0 to +50°C |
| Case Temperature | 90°C |
| Wiring Diagram Reference | See wiring diagram example H in the GE Lightech catalog (page 19-31). |
Dimensions
| Casing Length | 2.52 in |
| Casing Width | 1.34 in |
| Casing Height | 0.83 in |
| Weight | 0.25 lb |
| Lead Exit Type | Side |
| Input Wire Length | 7.1 in |
| Output Wire Length | 9.1 in |
Key Features
- Auto-Thermal Regulation proportionally dims output voltage above 90°C to protect the transformer and connected lamps.
- Self-preserving 125°C thermal cut-off for overload protection.
- Field-effect transistor design for higher efficiency, smaller size, and longer life than bipolar-transistor transformers.
- Trailing Edge dimming compatibility.
- Rated ambient operating range of 0 to +50°C.
Compatible Applications
- Low-voltage halogen and xenon lighting fixtures
- Retail display, showcase, and track lighting
- Architectural and accent lighting
- Signage and downlight fixtures
- Maintenance replacement where GE order code 66954 is specified
Before Ordering Verify
- Exact GE Order Code: Match GE 66954 to the existing transformer label or fixture documentation.
- Input Voltage: Confirm the fixture supply matches 277V.
- Output Wattage Range: Confirm the connected lamp load falls within 35-75W.
- Dimming: Confirm the dimmer is compatible with Trailing Edge dimming.
- Lead Exit & Mounting: Confirm Side lead exit and case dimensions (2.52" x 1.34" x 0.83") fit the available space.
Safety & Installation Guidelines
- Qualified Installation: Transformers should be installed by qualified personnel following applicable electrical codes.
- Disconnect Power: Turn off and lock out power before removing or installing a transformer.
- Minimum/Maximum Load: Keep the connected lamp load within the rated 35-75W range; operating outside this range can cause overheating or premature failure.
- Thermal Protection: This unit is rated to a 90°C case temperature with a self-preserving 125°C thermal cut-off; do not install in enclosed spaces that exceed the rated ambient temperature.
- Wiring Diagram: Follow the wiring diagram referenced on the transformer label before installation.
Wholesale & Project Support
ADL Supply supports contractors, facility managers, maintenance departments, and commercial buyers with GE Lightech transformer replacement identification, project quoting, and volume order support.
For volume pricing, availability, or help confirming the correct GE Lightech replacement transformer, contact ADL Supply at 1-800-235-3489.
