Intermatic Locking Type Therma...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$74.27
$20.53
Intermatic LC4521C Locking Type Thermal Photocontrol, 120 V

Intermatic Locking Type Thermal Photocontrol 120V with Cadmium Sulfide Photocell

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Model: LC4521C
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$74.27
$20.53
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Intermatic Locking Type Thermal Photocontrol 120V with Cadmium Sulfide Photocell

Professional outdoor lighting control with thermal protection and delay features

The Intermatic Locking Type Thermal Photocontrol delivers reliable 120V outdoor lighting automation with advanced thermal protection and precision photocell technology. Featuring a mechanical bimetal switch with Cadmium Sulfide photocell, this professional-grade photocontrol provides dependable ON/OFF switching for outdoor lighting applications. The integral high impact thermoplastic housing ensures durability in outdoor environments, while the locking type plug design enables quick installation and changeover on ANSI C136.10 NEMA receptacles.

Professional Features & Benefits

  • 120V AC Operation: Compatible with standard residential and commercial voltage systems for versatile outdoor lighting control applications.
  • Mechanical Bimetal Switch with Cadmium Sulfide Photocell: Provides precise light-sensing capability combined with thermal protection for reliable switching performance.
  • 3,650 ON/OFF Cycle Rating: Extensively tested switching capacity ensures long-term reliability and reduced maintenance requirements.
  • Integral High Impact Thermoplastic Housing: Durable construction withstands outdoor environmental conditions and provides lasting protection for internal components.
  • Delay Feature: Prevents unwanted OFF switching caused by temporary light sources, ensuring stable operation in varying conditions.
  • ANSI C136.10 Compliance: Meets industry standards for compatibility with standard NEMA receptacles commonly found on outdoor lighting fixtures.
  • 2-Year Limited Warranty: Backed by manufacturer warranty coverage for reliable performance and professional peace of mind.

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 Exterior Lighting
  • Parking Lot and Area Lighting Control
  • Security and Perimeter Lighting
  • Landscape and Architectural Lighting
  • Street and Pathway Lighting
  • Industrial Facility Outdoor Lighting

Why Choose Intermatic Quality?

Intermatic photocontrols deliver proven reliability with professional-grade construction and comprehensive testing. The 2-year limited warranty and ANSI C136.10 compliance ensure dependable performance and industry-standard compatibility. The high impact thermoplastic housing and thermal protection features provide lasting durability in demanding outdoor environments.

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 LC4521C – Frequently Asked Questions

1) Will the Intermatic LC4521C photocontrol fit the twist-lock socket on my parking lot fixture?
If the fixture has an ANSI C136.10 NEMA receptacle, yes. The LC4521C is a locking (twist-lock) type photocontrol built to that standard, so it drops onto the three-prong receptacle found on most area, street, and wall pack fixtures and twists a quarter turn to lock. No wiring needed at the fixture, which is what makes changeouts on a pole fast.
2) What voltage does the LC4521C photocontrol run on, and can I use it on a 208V or 277V fixture?
120 VAC, 50/60 Hz only. The LC4521C is a single-voltage 120V unit, so it will not work on a 208V, 240V, or 277V fixture. Those openings need a photocontrol rated for that voltage or a multi-tap 120-277V model. Getting this wrong on a commercial site is the most common reason a locking photocontrol fails right after install.
3) I'm replacing a failed photocell on an existing pole light. Is the LC4521C a direct swap?
If what came off was a locking-type photocontrol on a 120V fixture, yes. The LC4521C uses the same ANSI C136.10 locking base, so you twist the old one out and the new one in with the power on the circuit killed. What has to match is the voltage: confirm the fixture is 120V, because this unit is 120V only. The part number to order is LC4521C.
4) What is the difference between a thermal photocontrol and an electronic one?
The LC4521C is the thermal type: a mechanical bimetal switch paired with a cadmium sulfide photocell. Light level drives the cell, the cell heats the bimetal, and the bimetal makes or breaks the circuit. Thermal units are the traditional, low-cost choice and are rated in switching cycles rather than years, in this case 3,650 ON/OFF cycles. Electronic photocontrols switch solid state instead and are usually specified where long life on LED loads or very tight turn-on levels matter. If you are maintaining an existing fleet of thermal controls, staying thermal keeps the switching behavior consistent across the site.
5) Will this photocontrol shut my lights off when a car's headlights hit it?
No. The LC4521C has a delay feature that ignores brief light sources, so passing headlights, lightning, or a neighboring fixture will not trip the lights off. That delay is the reason these are used on parking lots and drive approaches where transient light is constant.
6) Is the Intermatic LC4521C rated for outdoor mounting on a pole or wall pack?
Yes, it is built for outdoor lighting control. The housing is integral high impact thermoplastic, which is the standard construction for pole-top and wall pack photocontrols exposed to sun, rain, and impact. It mounts in the fixture's receptacle rather than being wired in, so the fixture's own gasketed receptacle handles the weather seal.
7) Do I need an electrician to install this photocontrol?
Not for the swap itself. The LC4521C plugs into the fixture's existing ANSI C136.10 NEMA receptacle and locks with a twist, so there are no wire connections to make. The work is getting safe access to the fixture and de-energizing the circuit. If the fixture has no photocontrol receptacle at all, that is a wiring job and this unit is not the right part for it.
8) How tall is the LC4521C photocontrol, and will it clear a shield or guard over the receptacle?
The unit stands 2.75 inches high above the receptacle. That is the figure to check against any bird guard, shroud, or decorative cap over the photocell socket before you order a pole's worth.
9) What color is the Intermatic LC4521C, and does the color mean anything?
White with a grey band. On photocontrols the band color is how crews identify voltage class at a glance from the ground, so a mixed-voltage site benefits from keeping the banding consistent when you standardize. This one is the 120V unit.
10) How many switching cycles will an Intermatic thermal photocontrol handle before it needs replacing?
The LC4521C carries a 3,650 ON/OFF cycle rating. At one on and one off per day, that is the number maintenance planners use to schedule photocell replacement across a site rather than waiting for individual poles to fail.
How fast can I get the Intermatic LC4521C 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 LC4521C come with a warranty?
Absolutely. The Intermatic LC4521C 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 LC4521C?
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 LC4521C from ZenSupply?
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