Overview
The Intermatic K1121 is a proven relay-type photo control switch designed for automatic lighting control in commercial and industrial applications. Operating at 105-130VAC with a 1800W tungsten/ballast load rating, this photocontrol activates or deactivates electrical loads based on ambient light levels, making it ideal for dusk-to-dawn outdoor lighting systems, security lighting, and landscape applications.
Key Features
- Relay-type photocontrol with adjustable stem and swivel mount options
- Instant ON/OFF switching for responsive light-triggered control
- 6-inch color-coded leads for simplified installation and troubleshooting
- Polycarbonate housing rated for outdoor weathering
- 1/2 IN – 14 NPT thread connection for standard mounting
Technical Specifications
| Input Voltage | 105-130VAC |
| Frequency | 50/60 Hz |
| Power Rating (Tungsten Load) | 1800W |
| Ballast Load Rating | 1800VA |
| Amperage | 15,000 mA |
| Power Consumption | 3W |
| Operating Temperature Range | -40 to +158°F (-40 to +70°C) |
| Mounting Type | Adjustable Stem / Swivel Mount |
| Connection Type | 1/2 IN – 14 NPT Thread |
| Dimensions | 3″ Diameter × 5-3/4″ Height (76mm × 146mm) |
| Weight | 0.66 lbs |
| Housing Material | Polycarbonate |
| Series | K1100 |
Typical Applications
- Dusk-to-dawn outdoor area and parking lot lighting
- Commercial security lighting systems
- Landscape and decorative outdoor fixtures
- Building perimeter and entry lighting control
- Warehouse and industrial facility exterior illumination
Compatibility & Replacements
Compatible With
- Standard 105-130VAC electrical circuits
- Tungsten incandescent lamp loads
- Ballast-type HID (high-intensity discharge) fixtures
- Polycarbonate and metal outdoor fixtures
- 1/2 IN – 14 NPT threaded conduit systems
Replaces / Drop-In Replacement For
- Intermatic K1121 (direct replacement for worn or failed units)
- Legacy K1100 Series photocontrols with matching voltage/load specifications
- Similar 1800W relay-type photocontrols with adjustable stem mounting
Works With
- Manual override/bypass circuits
- Standard electrical panel wiring and conduit
- Relay logic control systems
- Building management systems with photocontrol interface
- Time-clock integration for extended control flexibility
