Intermatic Locking Type Therma...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$78.73
$25.69
Intermatic LC4521LA Locking Type Thermal Photocontrol, 120 V, Spark Arrestor

Intermatic Locking Type Thermal Photocontrol 120V with Spark Arrestor and Delay Feature

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Model: LC4521LA
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$78.73
$25.69
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Intermatic Locking Type Thermal Photocontrol 120V with Spark Arrestor and Delay Feature

Professional Outdoor Lighting Control with Advanced Thermal Protection

The Intermatic Locking Type Thermal Photocontrol delivers reliable 120V outdoor lighting automation with integrated spark arrestor protection and delay feature technology. This professional-grade photocontrol combines mechanical bimetal switching with Cadmium Sulfide photocell sensing in a high impact thermoplastic housing, ensuring dependable performance for outdoor lighting applications with ANSI C136.10 NEMA receptacle compatibility.

Professional Features & Benefits

  • 120V AC Operation: Compatible with standard residential and commercial voltage systems for versatile outdoor lighting control applications.
  • Delay Feature Technology: Prevents unwanted OFF switching during brief light interruptions, ensuring stable lighting operation and reducing unnecessary cycling.
  • Tested Durability: Proven through 3,650 ON/OFF cycle testing for long-term reliability in demanding outdoor environments.
  • Mechanical Bimetal Switch: Provides thermal protection and reliable switching action with Cadmium Sulfide photocell for accurate light sensing.
  • ANSI C136.10 Compliance: Meets industry standards for photocontrol compatibility with standard NEMA receptacles on outdoor lighting fixtures.
  • Locking Type Design: Enables quick installation and changeover with secure connection to prevent accidental disconnection.
  • Integral Spark Arrestor: Built-in protection against electrical arcing for enhanced safety and equipment protection in outdoor installations.

Technical Specifications

  • Applications: Outdoor Lighting Control
  • Country Of Origin: Mexico
  • Depth: NA in
  • Input Voltage Rating Range S : 120 VAC, 50/60 Hz
  • Marketing Description: These photocontrols install on light fixtures with ANSI C136.10 NEMA receptacles commonly found on
  • Product Color: White with Gray Band
  • Product Height: 2.75 in
  • Product Length: NA NA
  • Product Weight: NA lbs
  • Product Width: NA in
  • Warranty Period: 2-Year limited

Professional Applications

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

Why Choose Intermatic Quality?

Intermatic photocontrols deliver proven reliability with 2-year limited warranty coverage and ANSI C136.10 standard compliance. The high impact thermoplastic housing and mechanical bimetal switch construction ensure long-term durability in outdoor environments, while the white with gray band finish provides professional appearance and weather resistance for demanding lighting control 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 light fixtures with ANSI C136.10 NEMA receptacles commonly found on
Product Color:
White with Grey Band
Product Height:
2.75 in
Product Length:
NA NA
Product Weight:
NA lbs
Product Width:
NA in
Warranty Period:
2-Year limited
Product Depth:
NA in

Intermatic LC4521LA – Frequently Asked Questions

1) Will the Intermatic LC4521LA photocontrol fit the twist-lock receptacle on my existing pole light?
If the fixture has a three-prong ANSI C136.10 NEMA twist-lock receptacle, the LC4521LA drops right in. That is the standard locking-type socket found on area lights, street lights and most commercial pole fixtures. Line it up, twist to lock, and the connection holds without a separate fastener. Fixtures with a stem-mount or button photocell socket are a different prep and will not accept it.
2) Is this photocontrol 120V only, or will it work on 208-277V fixtures?
120 VAC only, 50/60 Hz. The LC4521LA is a single-voltage thermal photocontrol, so it is the wrong part for a 208V, 240V or 277V parking lot or roadway fixture. If your site runs 277V lighting, you need a photocontrol rated for that voltage or a multi-voltage 120-277V unit. Getting this wrong on a commercial pole run means the control fails on energization.
3) Why does my photocell keep flickering lights off when a car's headlights hit it, and does this one stop that?
That is exactly what the delay feature on the LC4521LA is for. Brief light interruptions, headlights sweeping the pole, lightning, a neighboring fixture, will not trip the control OFF. The delay holds the state so the lamp does not short-cycle. Cutting that cycling matters most on HID lamps, where every restrike shortens lamp life and leaves the area dark during warm-up.
4) What is a thermal photocontrol and how is it different from an electronic one?
The LC4521LA switches with a mechanical bimetal element heated by a cadmium sulfide photocell, rather than solid-state electronics. The bimetal gives a gradual, arc-limited make and break, and the unit carries an integral spark arrestor for added protection against arcing. Thermal controls are the long-standing choice for utility and area lighting on incandescent and HID loads. If you are switching LED drivers or need precise repeatable set points across a large fleet, an electronic photocontrol is the type to look at instead.
5) How long will an Intermatic LC4521LA thermal photocontrol last in a parking lot before it needs replacing?
Intermatic tested this photocontrol through 3,650 ON/OFF cycles. At one cycle per day, dusk to dawn, that works out to roughly ten years of switching. The housing is high impact thermoplastic, which is what keeps it serviceable outdoors on pole and building-perimeter fixtures.
6) Can I use this for street lighting and municipal pathway lighting, not just residential?
Yes. Outdoor lighting control is what the LC4521LA is built for, and the ANSI C136.10 locking base is the receptacle standard used on municipal street and roadway heads, parking lot poles, security lighting and industrial exterior fixtures. The only qualifier is voltage: the circuit has to be 120V.
7) How much clearance do I need above the fixture to install this photocontrol?
Allow about 2.75 inches of height for the LC4521LA above the receptacle, plus room to rotate it through the twist-lock. That matters under canopies, soffits and shielded luminaires where a shroud or fixture hood sits close over the socket.
8) Will this photocontrol match the look of the other photocells on my building?
The LC4521LA is white with a grey band, which is the common appearance for locking-type photocontrols on commercial exterior fixtures. For a property manager standardizing across a campus, it reads consistently against existing white twist-lock caps on pole heads and wall packs.
How fast can I get the Intermatic LC4521LA 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 LC4521LA come with a warranty?
Absolutely. The Intermatic LC4521LA 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 LC4521LA?
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 LC4521LA from ZenSupply?
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