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White and grey rectangular photocontrol unit with locking mount

Intermatic

Intermatic LC4521C Photocontrol Locking 120V AC Light Kit

SKU CH-6KE1-FW8BT

Photocontrol switches lights on at .5 foot-candles and off at 15 foot-candles with a 120 V AC locking base rated for 1,800 W incandescent or 8.3 A ballast loads

  • weight0.25
  • materialHAWA
  • Automatic dusk-to-dawn operation with .5 foot-candle activation
  • 120 V AC input supports up to 1,800 W incandescent load
  • Locking mounting base installs securely on standard fixtures
  • Raintight polypropylene housing rated from -40 °F to 158 °F
  • Certified to ANSI C136.10, cCSAus, California Title 20 and UL Listed

120V AC Locking Photocontrol

The Intermatic LC4521C is a locking-type photocontrol designed for 120V AC outdoor lighting circuits. It mounts securely to compatible fixtures and automatically switches loads from dusk to dawn. The unit suits municipal, commercial and residential installations that require a raintight, UL-listed control meeting ANSI C136.10 and California Title 20 standards.

Switching limits and environmental range

The SPST contact handles up to 1,800 watts incandescent at 15 amps or 8.3 amps ballast load. It turns on at 0.5 foot-candles and off at 15 foot-candles. Operating temperature spans -40 degrees to 158 degrees Fahrenheit. The polypropylene housing carries a raintight enclosure rating for direct exposure to weather.

Replaces twist-lock or stem-mount controls

This photocontrol replaces older twist-lock or stem-mount units on existing brackets when a locking base and the listed electrical ratings match the circuit. The upgrade is worth it when the installation demands ANSI C136.10 compliance, Title 20 adherence or a broader temperature range than the original device provides.

Highlights

  • Automatic dusk-to-dawn operation with .5 foot-candle activation
  • 120 V AC input supports up to 1,800 W incandescent load
  • Locking mounting base installs securely on standard fixtures
  • Raintight polypropylene housing rated from -40 °F to 158 °F
  • Certified to ANSI C136.10, cCSAus, California Title 20 and UL Listed

Specifications

BrandIntermatic
weight0.25
materialHAWA

Questions about this item

Which version of the Intermatic LC4521C should I choose for a standard 120V AC outdoor circuit?

The LC4521C is a single 120V AC locking photocontrol rated for 1,800 watts maximum, so one unit covers the typical residential circuit without needing multiple versions.

What does the 1,800-watt rating mean when the unit is installed on my lighting circuit?

It allows the photocontrol to switch up to 1,800 watts of incandescent load at 15 amps or 8.3 amps of ballast load, so the connected fixtures must stay within those limits.

How does the ANSI C136.10 locking interface affect installation and what does it cap in practice?

The ANSI C136.10 twist-lock base secures the photocontrol to a compatible receptacle and limits the installation to 120V AC circuits with a maximum of 1,800 watts incandescent or 8.3 amps ballast.

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