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LC4521C 120V NEMA Twist Lock

Intermatic LC4521C 120 Volt NEMA Twist Lock Photocell
Our price (Before qty discounts*): $9.67

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In stock
Item Number: LC4521C
Manufacturer: INTERMATIC
Manufacturer Part No: LC4521C - INT
Operating Voltage: 120 Volt
UPC: 078275002043
Product Specifications - Quick Reference
Volts AC:
Watts Tungsten:
120 Volts
1800 Watts
Mount Type:
3" Diameter x 2 3/4" High
NEMA Twist Lock
VA Ballast:
1000 VA
3 Year Limited
Amps Tungsten:
Amps Ballast:
15 Amps
8.3 Amps (50% PF)
Optional Sockets:
UL, CSA, Title 24
K121, K121-30 or K122
Intermatic Photo Controls provide dusk-to-dawn control of street, parking lot, billboard and security lighting. Mounting types include fixed position mounting, stem mounting and twist lock.  With so many different options, Intermatic and Green Electrical Supply have the right Photo Control sensors for your application. Click here to view other Intermatic Dusk-To-Dawn Photo Control Sensors.

The Intermatic LC4500 Series model number LC4521C, dusk-to-dawn photocell is designed for use with outdoor security, area lighting or wall packs.  The LC4500 series provides a low cost, reliable control in applications requiring a NEMA twist and lock type plug connection.  They operate on 120 volt, turn on in the evening when light levels reach 0.5 minimum footcandles and turn off in the morning when light level readings reach 15 footcandles maximum.  An integral polypropylene housing with UV protection keeps moisture out and ensures long life. The physical dimensions of the Intermatic LC4521C dusk-to-dawn photocell are 3.0" in diameter by 2 3/4 high. They comply with ANSI C136.10 standard, are UL and CSA approved and California Title 24 compliant, carry a 3 year warranty and are translucent with a color coded band for voltage identification. Click here to see the Intermatic Photo Controls Instruction Sheet.



Tips To Optimize Photocell Performance


Do not face the photocell into the midday sun. If the photo control is installed on the south side of a building, face the photocell east or west or point the photo control down toward the ground.  The best direction to face the photo control is north. 


Do not face the photocell where it can see artificial light. Light from windows, signs, street lights, etc., will cause the photo control not to switch on.  The photo control should not be positioned so that it sees the light it is controlling (or reflected light - like off of your white siding or white painted soffit overhang).  These conditions will cause the light to cycle on and off.


Do not install the photo control with wires up unless there is NO POSSIBILITY of water

entering the photo control around the wires. The photo control must be installed in an approved weatherproof box. Do not attempt to caulk around the wires. Installing a Photocell below the box is WRONG! Photocells installed on top of the Box is RIGHT! Any Photo Control installed by the side of the weatherproof box is: ACCEPTABLE!


When you are testing the photocell, be sure to turn on the power (load will come on)

and wait up to 5 minutes for the photocell to switch load off. For further testing cover the photo control completely with black tape or another dark material to simulate night conditions. If you cant cover the control with tape, try covering the photo control with the shipping carton to simulate night conditions.

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