Intermatic LC4521C 120 VAC 50/60 Hz 1800 W Twist-Lock Thermal Photocontrol
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Manufacturer Intermatic
Mfg Catalog # LC4521C
QED Part # 138103

Features & Applications


  • Mechanical bi-metal switch with Cadmium Sulfide photocell
  • Integral high impact thermoplastic housing
  • Locking type plug for quick installation and changeover
  • Delay feature prevents unwanted OFF switching
  • Complies with ANSI C136.10 standard
  • Tested to 3,650 ON/OFF cycles


  • Exterior Lighting
  • Street Lighting
  • Parking Lot
  • Pedestrian Pathway
  • Landscape Lighting


  • Photocontrol Style: Locking type
  • Photocontrol Sensor Location: Side
  • Inductive: 8.3 A, 120 VAC, 50/60 Hz
  • Incandescent Load Ratings: 15 A, 120 VAC, 50/60 Hz
  • Activation Off: 15 fc
  • Activation On: 5 fc
  • Sensor Time Delay: 30 sec to 90 sec
  • Wire Lead Length (mm): 0
  • Operating Temperature Max (°C): 70
  • Operating Temperature Max (F): 158
  • Operating Temperature Min (°C): -40
  • Operating Temperature Min (F): -40
  • Cover Color: White with Gray Band
  • Housing Material: Polypropylene
  • Product Weight (kg): 0.091
  • Product Weight (lbs): 0.2
  • Product Height (in): 2 3/4
  • Product Height (mm): 69.9
  • Warranty: 2-year limited
  • Fail Mode: ON

Documents & Downloads

Product Rating

Related Accessories and Parts

  • K171H: ANSI C136.41 7 PIN Locking type Receptacle (9" Lead)
  • K4500: Shorting Plug, Rating: 15 A, 480 VAC Max
  • K121: ANSI C136.10 Locking Type NEMA Receptacle, (9" lead), gasket included
  • K121-30: ANSI C136.10 Locking Type NEMA Receptacle, (30" lead), gasket included
  • K122: ANSI C136.10 Sealed Locking Type NEMA Receptacle with Pole Bracket


Long Description These photocontrols install on light fixtures with ANSI C136.10 NEMA receptacle commonly found on street light fixtures. Locking type design facilitates fast installation and replacement of photocontrol.
GTiN 00078275002043
Warranty Length 2 yr
Color Gray Band,White
Operating Temperature 104 degrees F
Type Cylinder Plain, Light/Dark, Thermal
Material Plastic
Applications Dusk to Dawn Lighting Control
Mounting Type Twistlock Mount
Height 2 3/4 in
Weight 0.2 lb
Standard CSA,California Title 24 Compliant,Title CA 20 Listed,UL Recognized
Frequency 50/60 Hz
Connection Type Lock Type
Temperature Rating -40 to 70 C
Family Brand Name Intermatic
Power Rating 1000 W
TC Connection Lock Type
Wire Length 0 mm
Power Consumption 1 W
Max Operating Temperature 158 degrees F
Blade Dimensions 70 mm H x 76 mm dia
Min Operating Temperature -40 degrees F
Voltage 120 VAC

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