NSi Industries AlumStem Die-Ca...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$74.91
NSi Industries AlumStem Die-Cast Aluminum Photocontrol, 120/208-277V

NSi Industries AlumStem Die-Cast Aluminum Photocontrol, 120/208-277V

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Model: 2119A

In Stock (leaves warehouse same day if ordered before 3pm ET)

$74.91
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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

Spec Sheet

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
Product Subgroup:
Lighting Controls & Sensors

NSi 2119A – Frequently Asked Questions

1) Will the NSi AlumStem photocontrol work on a 277V parking lot lighting circuit?
Yes. The AlumStem photocontrol (model 2119A) is rated 120/208-277 VAC, so it covers 120V, 208V, 240V and 277V fixture circuits on 50-60 Hz systems. One part number handles mixed-voltage sites, which is why it gets specified across parking lot and building perimeter lighting where the pole circuits are 277V but the wall packs are 120V.
2) Can this photocontrol switch LED fixtures, or is it only for HID and incandescent?
It handles all three. The AlumStem switches up to 2000W tungsten, 1800VA ballast, or 600VA LED. Size the LED load against the 600VA figure, not the tungsten rating, because electronic LED drivers are the limiting case. On an LED retrofit of an older HID pole fixture, total the driver VA for everything on the control before you reuse it.
3) How does the AlumStem photocontrol mount, and do I need a separate box?
It is a stem-mount unit with a 1/2 inch conduit mount stem and 6 inch leads, so it threads directly into a 1/2 inch knockout or hub on the fixture housing and wires to the fixture leads without a separate junction box or splice kit. If your fixture has a twist-lock receptacle on top instead of a threaded knockout, this is the wrong style, you need a locking-type photocontrol.
4) At what light level does the NSi 2119A photocontrol turn lights on and off?
Turn-on happens at 1 to 5 footcandles and turn-off at 3 to 15 footcandles. That gap between on and off points is deliberate, it keeps the unit from hunting at twilight. A 2 minute timing range adds further delay so headlights or a passing truck's lamps don't cycle the fixture.
5) Will a photocontrol like this survive a northern winter mounted outdoors?
The AlumStem is rated for -40 to +140 F ambient and uses a die-cast aluminum enclosure rather than plastic, so it holds up to freeze-thaw cycling, UV, and rain on exposed pole and wall mounts. The aluminum body is also the reason it gets picked for coastal and industrial sites where polycarbonate housings chalk and crack.
6) What kind of sensor does this photocontrol use, and does that affect how long it lasts?
Switching is governed by a cadmium sulphide cell, the traditional photoresistive cell used in dusk-to-dawn controls. It reads ambient daylight directly rather than running on a timer or astronomic clock, so there is nothing to program and no clock to reset after an outage. For a property manager standardizing a site, that means no commissioning step, you thread it in, wire it, and it follows the sun.
7) Does the photocontrol itself add meaningful load to the circuit?
No. The AlumStem's own consumption is under 1 watt, so it is negligible against the fixture load even when dozens are installed across a site.
How fast can I get the NSi 2119A delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the NSi 2119A come with a warranty?
Absolutely. The NSi 2119A is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the NSi 2119A?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the NSi 2119A from ZenSupply?
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