Robertson RSO140C120WS (3P20129) Electronic Preheat Rapid-Start Circline Ballast 120V for Single FC16T9 (40 W) or FC12T9 (32 W) Lamps (Qty 1)

The Robertson RSO140C120WS is a highly dependable electronic preheat rapid-start ballast engineered for single-circuit fluorescent Circline lighting applications. Compatible with FC16T9 (40 W) and FC12T9 (32 W) lamps, it delivers smooth ignition and consistent lumen output in both residential and commercial spaces. Built with robust, encased, and potted construction, it offers maximum thermal and surge protection along with end-of-lamp-life safeguards. Rated for ambient conditions from 0 F to 131 F (18 C to 55 C) and enduring over 15,000 lamp starts, this ballast ensures long-lasting, maintenance-free performance. Its Class A quiet operation and compliance with leading safety and EMI standardsincluding UL, cUL, FCC, and ANSImake it ideal for noise-sensitive and regulated environments. The integrated socket connector simplifies installation and retrofitting into existing Circline fixtures. Engineered as a replacement for models like the KTEB1401TPWSEMI, the RSO140C120WS offers a seamless upgrade path for older fixtures.

• Preheat Rapid-Start Electronic Ballast - Designed to deliver smooth, energy-efficient ignition and reliable operation for single Circline lampsFC16T9 (40 W) or FC12T9 (32 W) models
• Direct Replacement with Socket Connector - Features an integrated socket connector for straightforward replacement in recessed Circline fixtures. Crosses with the KTEB1401TPWSEMI and others.
• Quiet, Safe & Compliant - Normal power factor, sound-rated A, and compliant with UL/935 (Class P, Type 1 Outdoor), cUL (CSA C22.2), FCC Part 18 (Class B), ANSI C82.11, and ANSI C62.41 standards.
• Encased & Potted Construction - Durable design includes internal surge and end-of-lamp life protection. Rated for ambient up to 131F (55 C) and maximum case temperature of 167F (75 C).
• Reliable Performance Across Temperatures - Starts reliably at 0 F (18 C), supports more than 15,000 starts, and allows remote mounting up to 18 ft.