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Rectangular metal ballast case, grey finish, 9.5 by 1.7 by 1.2 inches, pack of 10

GE Lighting

GE Lighting 85857 GETR277/120-175W ProLine Magnetic Ballast (case of 10)

SKU CH-VE42-F19A2

Case of ten magnetic ballasts step 277 V down to 120 V at 60 Hz with 93 % efficiency and a 100 °C auto-reset thermal protector

  • Steps 277 V down to 120 V for lighting loads
  • 93 % electrical efficiency cuts energy waste
  • Auto-reset thermal protector rated at 100 °C
  • Precision-wound coils spread heat evenly
  • Case of 10 ballasts simplifies project stock

Product identity

The GE Lighting 85857 GETR277/120-175W ProLine magnetic ballast is a non-isolated autotransformer designed to step down 277V rms input at 60Hz to 120V rms full-load output. It is supplied as a case of 10 units for commercial or industrial lighting projects that require voltage conversion for 120V or universal-voltage electronic ballasts.

Sustained-load behaviour

With 93% electrical efficiency the autotransformer maintains stable output when powering loads up to the maximum total system power of 175W. Precision-wound coils promote even heat dissipation during continuous operation and the internal auto-reset thermal protector rated at 100C interrupts the circuit if temperatures exceed the limit, then restores power once the unit cools.

Thermals noise and power draw

The magnetic core-and-coil construction operates silently without fans, so acoustic output is negligible in normal use. Physical dimensions are 9.5 inches long, 1.7 inches wide and 1.2 inches high, allowing installation in standard lighting enclosures. Power draw follows the connected load up to the 175W rating while the 93% efficiency figure indicates minimal losses during typical operation.

Highlights

  • Steps 277 V down to 120 V for lighting loads
  • 93 % electrical efficiency cuts energy waste
  • Auto-reset thermal protector rated at 100 °C
  • Precision-wound coils spread heat evenly
  • Case of 10 ballasts simplifies project stock

Specifications

BrandGE

Questions about this item

How hot does the GETR277/120-175W autotransformer run during continuous 277V-to-120V step-down operation?

The internal auto-reset thermal protector is rated at 100°C and precision-wound coils promote even heat dissipation, so the unit self-protects if winding temperature reaches that threshold.

What lamp ballasts must already be installed for the GE 85857 to serve its purpose?

One or more electronic 120V or universal-voltage fluorescent ballasts with a combined load not exceeding 175W total system power.

Will the 9.5×1.7×1.2 in magnetic core-and-coil unit fit in the same enclosure as my legacy 277V magnetic ballasts?

It is designed for single-phase 277V/60Hz supply and steps down to 120V for modern electronic ballasts, so it replaces the old ballast rather than sharing its enclosure.

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