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Compact rectangular autotransformer, grey metal enclosure with terminal connections

GE Lighting

GE Lighting Autotransformer 480/277V 250VA

SKU CH-4W88-DX035

Steps down 480 V input to 277 V output at 250 VA with a 0.85 ballast factor and 0.93 power factor

  • Steps 480 V down to 277 V for compatible fixtures
  • 250 VA rating handles typical lighting loads
  • 93 power factor reduces reactive losses
  • UL listed for code-compliant installations
  • Operates from -20 °F to 50 °C ambient

GE Lighting Autotransformer 480/277V

This GE Lighting autotransformer steps down 480 V input to a 277 VAC output for lighting circuits. It carries a 250 VA rating with an input current of 0.56 A and an output current of 0.903 A. The unit measures 9.5 in length, 1.19 in width and 1.69 in height. It is UL Listed and new.

Suits 277 V lighting retrofits

Electrical contractors converting 480 V distribution to 277 V fixtures will find the 0.85 ballast factor and 0.93 power factor match common ballast requirements. The ambient range of 0 to 50 °C and a minimum starting temperature of -20 °F support indoor and covered outdoor installations. Buyers who need isolation between primary and secondary windings should look at a true isolation transformer instead.

250 VA rating decides fit

The single specification that determines suitability is the 250 VA apparent power rating. It defines the maximum connected ballast load the autotransformer can supply without overheating. Verify that the total VA of all fixtures on the circuit stays at or below this value before specifying this unit.

Highlights

  • Steps 480 V down to 277 V for compatible fixtures
  • 250 VA rating handles typical lighting loads
  • 93 power factor reduces reactive losses
  • UL listed for code-compliant installations
  • Operates from -20 °F to 50 °C ambient

Specifications

BrandGE CURRENT

Questions about this item

Which voltage configuration matches my 480 V supply and 277 V fixtures?

The autotransformer accepts a 480 V input and delivers a 277 V output, so it fits a 480 V source feeding 277 V lighting circuits.

What load can the 250 VA rating actually support in my installation?

At 277 V output the 250 VA rating provides up to 0.903 A, enough for ballasts drawing roughly 250 W with a 0.85 ballast factor and 0.93 power factor.

Does the UL listing cover the 0 to 50 °C ambient range in my ceiling plenum?

Yes, the UL listing applies across the full 0 to 50 °C ambient temperature range and down to a -20 °F minimum starting temperature.

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