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Small rectangular electronic transformer, matte grey finish, bottom feed terminals, compact 88.3 by 36.5 by 29.1 mm

GE Lighting

GE Lighting 66955 LET-75-AC-277-R-BF 75W 12V 277V bottom feed ballast

SKU CH-E147-GXRC7

A 75 watt dimmable electronic halogen transformer accepting 277 volt input and delivering 12 volt output with bottom feed wiring

  • Powers 35-75W halogen loads with stable 11.5V output
  • Accepts 277V input for commercial wiring compatibility
  • Bottom-feed design simplifies tight-fixture installation
  • Trailing-edge dimming works with standard dimmer switches
  • Compact 88.3 x 36.5 x 29.1mm footprint fits confined spaces

Halogen Transformer for 277V Systems

The GE Lightech LET-75-AC-277-R-BF is a 75 watt electronic transformer that converts 277V input to 12VAC output for halogen lighting. It suits commercial signage, architectural installations, downlights and track lighting where a 277V supply is standard. The unit is dimmable via trailing-edge controls and carries the GE Lightech branding.

Bottom-Feed Wiring and Dimming Notes

Bottom-feed terminals allow wire entry from the base, which simplifies routing inside tight cans or track heads. Verify that the dimmer is rated for trailing-edge operation; leading-edge dimmers can cause flicker or damage. The transformer operates within a 35 to 75 watt load range, so the connected lamps must fall inside that window.

75W Capacity with 35W Minimum

The transformer delivers 11.5V output and handles loads from 35 watts up to its 75 watt rating. Running below 35 watts may result in unstable operation or reduced lamp life. At the top end, total lamp wattage must not exceed 75 watts, otherwise the unit will hit its protection limit.

Highlights

  • Powers 35-75W halogen loads with stable 11.5V output
  • Accepts 277V input for commercial wiring compatibility
  • Bottom-feed design simplifies tight-fixture installation
  • Trailing-edge dimming works with standard dimmer switches
  • Compact 88.3 x 36.5 x 29.1mm footprint fits confined spaces

Specifications

BrandGE

Questions about this item

How can I verify the LET-75-AC-277-R-BF is operating correctly after installation?

Measure the output with a multimeter; it should read approximately 11.5 VAC when the connected halogen load is between 35 and 75 watts and the 277 V input is live.

What comes with the 66955 transformer and what must I source separately?

The unit ships as the electronic transformer only; you must supply the 277 V supply wiring, compatible 12 V halogen lamps totalling 35–75 W, and a trailing-edge dimmer if dimming is required.

Which version of the GE Lightech 75 W halogen transformer should I choose for a 277 V supply?

Select the LET-75-AC-277-R-BF (part 66955) — it is the only listed model rated for 277 V input, 12 VAC output, bottom-feed wiring and trailing-edge dimming.

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