We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular magnetic core and coil ballast in grey metal casing, 9.5 by 1.7 by 1.2 inches

GE Lighting

GE Lighting 85857 GETR277/120-175W LFL ProLine Magnetic Core & Coil Ballast

SKU CH-Y1F5-PZS8W

Steps down 277 V to 120 V for lighting loads up to 175 W with 93 % electrical efficiency and a 100 °C auto-reset thermal protector

  • Steps 277 V down to 120 V for compatible lighting loads
  • 93 % electrical efficiency reduces wasted energy
  • Auto-reset thermal protector rated at 100 °C guards against overheating
  • Precision-wound coils distribute heat evenly for reliable operation
  • Compact 9.5 × 1.7 × 1.2 in form factor fits tight installations

Product Identity

The GE Lighting 85857 is a ProLine magnetic core and coil ballast built as a non-isolated autotransformer. It steps down a 277Vrms, 60Hz input to a 120Vrms full-load output for lighting circuits.

Suitability

This unit suits installers needing to power one or more electronic 120V ballasts within a 175W total system limit. It is not for isolated transformer needs, frequencies other than 60Hz, or loads exceeding the stated maximum total system power.

Decisive Specification

The autotransformer delivers 93% electrical efficiency and includes an internal auto-reset thermal protector rated at 100C. Precision-wound coils ensure even heat dissipation and high electrical integrity within the 9.5 by 1.7 by 1.2 inch enclosure.

Highlights

  • Steps 277 V down to 120 V for compatible lighting loads
  • 93 % electrical efficiency reduces wasted energy
  • Auto-reset thermal protector rated at 100 °C guards against overheating
  • Precision-wound coils distribute heat evenly for reliable operation
  • Compact 9.5 × 1.7 × 1.2 in form factor fits tight installations

Specifications

BrandGE

Questions about this item

What input voltage must my building supply for the GE 85857 autotransformer to operate?

The unit requires a 277 Vrms, 60 Hz single-phase supply; it will not function on other voltages or frequencies.

Can I keep my existing 120 V electronic ballasts and run them from this GE 85857 step-down unit?

Yes, it is designed to power one or more 120 V or universal-voltage electronic ballasts as long as their combined load stays within the 175 W maximum.

How can I confirm the GE 85857 is delivering the correct 120 V output after installation?

Measure the output with a multimeter under load; it should read 120 Vrms when the input is 277 Vrms at 60 Hz.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.