INTK4021C MFG #: K4021C
$10.52 / Each
25 Currently In Stock
  • Brand Name: Intermatic
  • Operating Temperature: -40 to 158 deg F
  • Tungsten Watts: 1800 W
  • Offerings: Products
The Intermatic INTK4021C K4000 series fixed position mounting photo controls are thermal type photo controls that fit into a standard outlet box, post lamp, or wall pack. The photo controls provide dusk to dawn lighting control along with a delay action, which eliminates loads switching off due to car headlights and lightning. The thermal type controls feature a cadmium sulfide photocell and a sonic welded polycarbonate case and lens to seal out moisture. The design utilizes a dual temperature compensating bimetal and composite resistor for reliable long life operation over ambient temperature extremes.
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  • Ballast Current Rating
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  • Manufacturer Name
  • Mounting
  • Overview
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Dusk to Dawn Lighting Control
8.3 A
1000 VA
Color Coded Lead
5/8 IN - 18 Thread
50/60 Hz
Intermatic Incorporated
Button Fixed Mount


  • Sonic welded polycarbonate housing and lens to seal out moisture
  • Delay action eliminates load switching off due to car head lights and lightning
  • Most models equipped with a 5/8 in - 18 in threaded side mounting, locking nut and washer gasket
  • These photo controls install within lighting fixtures, post lamps, or in-wall boxes to provide dusk to dawn on/off control of outdoor lighting
  • Cadmium Sulfide


  • Exterior Lighting
  • Street Lighting
  • Parking Lot
  • Pedestrian Pathway and Landscape Lighting
1 W
1-5 FC ON, 3-15 FC OFF
Thermal Type Photo Control (Cadmium Sulfide)
1-13/16 LENGTH X 1-5/16 WIDTH X 1-9/16 DEPTH IN, 4.6 LENGTH X 3.3 WIDTH X 4 DEPTH CM
Automatic Switching
Features: Cadmium Sulfide Photocell, Sonic-Welded Polycarbonate Housing, 9 IN Wire Leads
UL Recognized, CSA, Title CA 20 Listed, California Title 24 Compliant
120 VAC
15 AMP
Thermal Type Photo Cell