Lighting Controls

K, LC Series

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Product Bar End

K, LC Series

Photo Switch K, LC Series

Photo Switch


The Intermatic Models K and LC Photo Switches are universally employed to control lighting loads in response to available natural light. Each will turn on at dusk and off at dawn, and each may be connected to directly switchloads up to its continuous rating or to switch larger loads through relays or contactors. Stem mount types (see specifications below) are equipped with a 1/2″ MNPT nipple and locknut for mounting to a weatherproof box or conduit body.Stem/swivel mount types attach in the same manner, but include a swivel for directional aiming.


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  • On at dusk, off at dawn operation
  • Weatherproof enclosure
  • Simple installation and wiring
  • Heavy-duty switch to control loads directly
  • Fail safe, contacts remain closed in case of cell failure
  • Ideal for outdoor parking, billboard, or security lighting
  • UL listed, CSA approved

Supply Voltage:120/208-277/480 VAC, 50/60 Hz, <2W

Relay Type:SPST, N.O., Switch contact

Sensor Type:Cadmium Sulfide photocell

Setpoint :On at dusk, off at dawn operation

K41, K4221:Slide cover adjust (On from 1-5 fc), (OFF from 3-15 fc)

K4251:Fixed (ON @ 5 fc), (OFF @ 15 fc)

LC:Fixed (ON @ 0.5 fc), (OFF @ 15 fc)

Off delay:Approximately 7 minutes

Operating Temperature:

K41, K42:-40℉ to 158℉ (-40℃ to 70℃)

LC:-20℉ to 104℉ (-29°C to 40℃)

Operating Humidity:0% to 100% Condensing

Wiring Terminations:Three 6″ Pigtail leads, 14 AWG


K41, K42:Stem with 1/2″ MNPT into box

LC:Industry standard twist lock mount to K122 socket (order seporatly)

K122:Industry standard LC socket and pole mount bracket

Enclosure Rating:

K41, K42:Polycarbonate case and lens, equivelant to NEMA 3R

LC:Polypropylene w/ UV protection, equivelant to NEMA 3R


K41, K42:0.14 lb (0.06 Kg)

LC:2 lb (0.09 Kg)

Approvals:California Title 20, UL FIle #E42722, E59121, CSA


K41, K42:5 year

LC:3 year


Download Additional Data

document   K, LC Series Catalog Page
document   K4 Series Instructions