Intermatic Stem Mount Thermal ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$79.60
$20.09
Intermatic K4121C Stem Mount Thermal Photocontrol, 120 V

Intermatic Stem Mount Thermal Photocontrol 120V with Cadmium Sulfide Photocell and Delay Feature

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Model: K4121C
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$79.60
$20.09
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Intermatic Stem Mount Thermal Photocontrol 120V with Cadmium Sulfide Photocell and Delay Feature

Professional Outdoor Lighting Control with Thermal Protection

The Intermatic Stem Mount Thermal Photocontrol delivers reliable automatic lighting control for outdoor applications with 120V operation. Featuring a mechanical bimetal switch with Cadmium Sulfide photocell technology and built-in delay feature, this photocontrol prevents unwanted OFF switching while providing consistent performance. The gray plastic housing with 1�2"-14 NPSM threaded stem ensures secure installation on standard outdoor light fixtures and electrical boxes.

Professional Features & Benefits

  • 120V AC Operation: Compatible with standard residential and commercial outdoor lighting systems for versatile installation options.
  • Cadmium Sulfide Photocell Technology: Provides accurate light sensing for reliable dusk-to-dawn operation and energy efficiency.
  • Delay Feature: Prevents unwanted OFF switching from temporary light sources like car headlights, ensuring stable lighting control.
  • Mechanical Bimetal Switch: Offers thermal protection and long-lasting switching performance in outdoor environments.
  • 1�2"-14 NPSM Threaded Stem: Standard threading ensures compatibility with most outdoor light fixtures and electrical boxes.
  • Gray Plastic Housing: Weather-resistant construction provides durability in outdoor applications with UV protection.
  • 2-Year Limited Warranty: Backed by manufacturer warranty for reliable long-term performance and peace of mind.

Technical Specifications

  • Applications: Outdoor Lighting Control
  • Country Of Origin: Mexico
  • Depth: 1.563 in
  • Input Voltage Rating Range S : 120 VAC, 50/60 Hz
  • Marketing Description: These photocontrols install on standard outdoor light fixtures and electrical boxes with 1�2"-14 NP
  • Product Color: Gray
  • Product Height: 3 in
  • Product Length: NA NA
  • Product Weight: NA lbs
  • Product Width: 1.563 in
  • Warranty Period: 2-Year limited

Professional Applications

  • Residential Outdoor Lighting Systems
  • Commercial Building Exterior Lighting
  • Parking Lot and Area Lighting
  • Security and Perimeter Lighting
  • Landscape and Architectural Lighting
  • Industrial Facility Outdoor Lighting
  • Municipal and Street Lighting Applications

Why Choose Intermatic Quality?

Intermatic photocontrols deliver proven reliability with mechanical bimetal switch technology and weather-resistant gray plastic construction. The 2-year limited warranty and standard 1�2"-14 NPSM threading ensure professional-grade performance and easy installation compatibility across diverse outdoor lighting applications.

Manufacturer Resources

Product Specs

Application:
Outdoor Lighting Control
Country Of Origin:
Mexico
Input Voltage Rating Range S :
120 VAC, 50/60 Hz
Marketing Description:
These photocontrols install on standard outdoor light fixtures and electrical boxes with 1⁄2"-14 NP
Product Color:
Grey
Product Height:
3 in
Product Length:
NA NA
Product Weight:
NA lbs
Product Width:
1.563 in
Warranty Period:
2-Year limited
Product Depth:
1.563 in

Intermatic K4121C – Frequently Asked Questions

1) Can I run the Intermatic K4121C photocontrol on 277V or 208V circuits?
No. The K4121C is a 120 VAC unit, 50/60 Hz only. On a 277V parking lot or commercial pole circuit it will fail. For those openings you need a photocontrol rated for that voltage, or a multi-tap 120-277V model. Check the circuit at the fixture before ordering, because 120V and 277V photocontrols look identical on the shelf.
2) Why does my photocontrol keep cycling the lights off when a car drives by, and does the K4121C fix that?
That is a photocontrol with no delay reacting to headlights or a passing beam. The K4121C has a built-in delay feature specifically to prevent unwanted OFF switching from temporary light sources, so a headlight sweep across the cell will not drop the fixture. It is a common swap on driveway, garage, and parking area lighting where the old cell chatters.
3) How much clearance do I need above the fixture for an Intermatic K4121C photocontrol?
The K4121C body measures 3 x 1.563 x 1.563 inches, so allow about three inches of vertical clearance above the mounting hole plus room to turn the stem in. That matters under soffits, inside lighted bollard caps, and anywhere a decorative shroud sits close over the fixture top.
4) Is the Intermatic K4121C a mechanical or an electronic photocontrol?
Mechanical. The K4121C switches with a bimetal thermal element triggered by a cadmium sulfide photocell, rather than a solid state relay. Bimetal units turn on and off with a slow thermal action rather than an instant snap, which is part of how the delay behaves. If you are specifying for a facility standardized on electronic or solid state controls, this is the other type.
5) What is the part number to order for the Intermatic stem mount 120V thermal photocontrol?
Order Intermatic K4121C. That is the full part number for the stem mount thermal photocontrol with the cadmium sulfide cell and delay, 120V. There are no finish, length, or rating options to specify against it, it ships as one configuration.
6) Will the Intermatic K4121C hold up mounted outdoors year round?
It is built for outdoor lighting control, in a gray plastic housing made for weather exposure. The stem mount seats it into the fixture or box so the wiring stays inside the enclosure. For property managers standardizing dusk-to-dawn control across a portfolio, one model number, K4121C, covers building exteriors, walkways, and area lighting that is all on 120V.
How fast can I get the Intermatic K4121C 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 Intermatic K4121C come with a warranty?
Absolutely. The Intermatic K4121C 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 Intermatic K4121C?
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 Intermatic K4121C from ZenSupply?
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