71A9843-600 Advance Step-Down AutoTransformer - 480/347V to 277/190V 350VA

Advance Step-down Auto-transformer 480V to 277V or 347V to 190V, Max Load 350VA, Core and Coil

Advance 71A9843-600 Step-Down Transformer (350VA, 480V to 277V or 347V to 190V)

The Advance 71A9843-600 by Signify is a rugged open core and coil step-down autotransformer designed for commercial and industrial lighting applications. This 350VA transformer safely steps down 480V or 347V line voltages to 277V or 190V, allowing standard 277-volt electronic ballasts and LED drivers to operate seamlessly on high-voltage electrical systems. Its compact magnetic core design ensures reliable, long-term power conversion within the luminaire.

Core Specifications & Features

• Component Type: Step-Down Auto Transformer (Open Core & Coil).
• Maximum Load: Rated for up to 350 VA (Volt-Amperes).
• Input Voltage: 480V or 347V.
• Output Voltage: 277V (when fed 480V) or 190V (when fed 347V).
• Maximum Input Current: 0.65 Amps.
• Enclosure & Mounting: Open core and coil configuration designed for internal mounting within a lighting luminaire.
• Dimensions: Approximately 4.2" Length × 2.19" Width × 2.63" Height.

Electrical Performance Data

Frequently Asked Questions

Is this a ballast?

No, the 71A9843-600 is a step-down autotransformer. It does not ignite or regulate a lamp on its own. It is designed to be paired with an appropriate 277V ballast or LED driver.

What is the purpose of a step-down transformer in lighting?

A step-down transformer allows you to utilize standard voltage ballasts and drivers (like 277V) on higher voltage commercial power lines (such as 480V). It steps the voltage down to a usable level before the power reaches the ballast.

What does the 350VA rating mean?

The Volt-Ampere (VA) rating represents the maximum apparent power the transformer can safely handle. You must ensure that the total power draw of the connected ballast or LED driver does not exceed 350VA.