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NSi Industries AlumStem Stem-Mount Photocontrol, 120/208-277V, 2000W Tungsten
Model: NSI-2129A-P
NSi
NSi Industries AlumStem Die-Cast Aluminum Photocontrol, 120/208-277V
The NSi Industries AlumStem Photocontrol is a stem-mount photoelectric control engineered for dependable dusk-to-dawn lighting operation in commercial, industrial, and municipal outdoor applications. Built around a rugged die-cast aluminum enclosure and a 1/2" conduit mount stem with 6" leads, this photocontrol installs quickly into parking lot fixtures, wall packs, and area lighting where a compact, weather-resistant stem-mount sensor is required. It is rated for 120/208-277 VAC supply voltage and can switch loads up to 2000W tungsten, 1800VA ballast, or 600VA LED, making it a versatile retrofit-friendly control for mixed lighting technologies. A cadmium sulphide sensor cell governs switching, turning the connected fixture on at 1 to 5fc and off at 3 to 15fc so lighting responds accurately to ambient daylight levels. The unit carries cULus listing, supporting code-compliant installation on commercial and industrial electrical projects.
Key Features
- Trade Size: 1/2" conduit mount stem allows direct, secure installation into standard fixture housings.
- Durable Construction: Die-cast aluminum enclosure resists corrosion and withstands sustained outdoor exposure to sun, rain, and temperature swings.
- Wiring: 6" leads simplify connection to fixture wiring without additional splice hardware.
- Electrical Rating: 120/208-277VAC supply voltage; switches loads up to 2000W tungsten, 1800VA ballast, or 600VA LED for flexible use across lighting types.
- Sensor Type: Cadmium sulphide photocell with turn-on sensitivity of 1 to 5fc and turn-off sensitivity of 3 to 15fc for consistent dusk-to-dawn switching.
- Operating Range: Rated for -40 to +140 F ambient conditions, suitable for demanding outdoor climates.
- Timing: 2 minute timing range helps prevent nuisance switching from transient light sources.
- Frequency Rating: Compatible with 50-60 Hz electrical systems.
Certifications & Compliance
- cULus Listed
Technical Specifications
- Refer to manufacturer documentation for complete technical specifications.
Typical Applications
- Parking Lot Lighting Control
- Building Perimeter Lighting
- Outdoor Signage Lighting
- Dusk-to-Dawn Fixture Control
- Wall Pack and Area Lighting Fixtures
- Commercial, Industrial, and Municipal Outdoor Installations
Why NSi Industries?
NSi Industries engineers the AlumStem photocontrol with a die-cast aluminum enclosure and a cadmium sulphide sensor cell to deliver dependable, code-compliant lighting control for demanding outdoor environments. Its wide 120/208-277VAC supply range and multi-load switching capacity across tungsten, ballast, and LED sources make it a practical choice for retrofit and new-construction lighting projects alike. Backed by cULus listing, this photocontrol gives electrical contractors and facility managers a reliable, low-maintenance solution for automated dusk-to-dawn switching.
Manufacturer Resources
Product Specs
- Mounting Method:
- 1/2 Conduit Mount
- Environmental Conditions:
- -40 to + 140 F
- Product Voltage:
- 120/208-277 VAC
- Product Wattage:
- Under 1 Watt
- Sensor Type:
- Cadmium Sulphide Cell
- Sensitivity:
- Turn On Is 1 to 5fc - Turn Off is 3 to 15fc
- Standards:
- cULus
- Timing Range:
- 2 Minutes
- Operating Temperature:
- -40 to + 140 F
- Frequency Rating:
- 50-60 Hz
- Configuration:
- Die Cast Aluminum
- Application:
- Parking Lot-Building Perimeter-Outdoor Signage Lighting
- Product Material:
- Die-Cast Aluminum
- Product Type:
- Photocontrol
- Listing:
- cULus
- Department:
- Electrical
- Product Group:
- Wiring Devices