Overview
The Robertson SS2PWS is an electromagnetic fluorescent circline ballast rated for 120V 60Hz operation at 0.35A. This Class P Type 1 ballast is engineered for preheat self-start operation of single circline lamps, delivering reliable performance in commercial lighting applications. The compact magnetic design makes it suitable for retrofit and replacement installations in offices, board rooms, retail environments, and general facility lighting.
Key Features
- Preheat Self-Start Operation: Automatic lamp ignition without external starter requirement
- Class P Type 1 UL Listed: Meets UL/935 and CSA (cUL) safety certifications for both indoor and outdoor Type 1 enclosure installations
- Compact Magnetic Design: Encased and potted construction for durability and protection
- Normal Ballast Factor: Ballast factor of 0.79 provides standard lamp light output
- Sound Rated Class A: Low acoustic output suitable for quiet environments
- Normal Power Factor: Standard power factor design with thermal protection
Technical Specifications
The Robertson SS2PWS ballast is designed to operate one FC6T9 (20W) or FC8T9 (22W) circline fluorescent lamp. Input voltage is 120V single-phase, 60Hz. Output current is 0.35A nominal. The ballast operates with a normal ballast factor of 0.79 and maintains a crest factor of 1.7. The unit features an automatic reset thermal protector and includes a 9-inch socket assembly connector. Mounting is typical ballast-can format with standard electrical connections.
Typical Applications
- Commercial office lighting and ambient illumination
- Retail and display case lighting
- Board room and conference room fixtures
- General facility maintenance and retrofit replacement
- Circline fixture upgrades where compact design is needed
Compatibility & Replacements
Compatible With
- FC6T9 circline fluorescent lamps (20W)
- FC8T9 circline fluorescent lamps (22W)
- Standard 120V single-phase AC circuits, 60Hz
- Fixtures with preheat self-start ballast wiring
Replaces / Drop-In Replacement For
- Robertson SS2PWS (original equipment)
- Robertson SSN2PWS variants with socket connector configuration
- Other single-lamp 120V Class P circline ballasts with compatible lamp bases
Works With
- Circline lamp fixtures with G10q or 4-pin socket connectors
- Standard building lighting circuits and controls
- Thermal overload protection systems
- Standard UL/CSA Listed electrical installations
