Overview
The Intermatic K4035 is a fixed-position thermal photocontrol designed for automatic dusk-to-dawn control of outdoor lighting systems. Part of Intermatic’s K4000 series, this button mount unit operates at 480VAC, 50/60 Hz and features a cadmium sulfide photocell with mechanical bimetal switch technology. The K4035 installs directly within lighting fixtures, post lamps, or wall-mounted boxes to provide reliable ON/OFF switching with built-in delay action.
Key Features
- Cadmium Sulfide Photocell: Sensitive detection of ambient light levels for accurate dusk-to-dawn activation
- Mechanical Bimetal Switch: Dual temperature-compensating design ensures stable operation across temperature extremes
- Delay Action: 30-90 second time delay eliminates false triggering from vehicle headlights and transient lighting
- Polycarbonate Housing: Sonic-welded case and lens seal out moisture for outdoor reliability
- Fixed Mount Button Design: Compact form factor fits standard outlet boxes and lighting fixture cutouts
- Wide Load Compatibility: Supports tungsten (7200 W) and ballast (4000 VA) loads; suitable for fluorescent, HID, and incandescent lighting
Technical Specifications
| Input Voltage | 480 VAC, 50/60 Hz |
| Frequency | 50/60 Hz |
| Load Rating (Tungsten) | 7200 W maximum |
| Load Rating (Ballast) | 4000 VA maximum |
| Output Current | 15 A |
| Photocell Type | Cadmium Sulfide (CdS) |
| Activation ON Level | 1 to 5 foot-candles (fc) |
| Activation OFF Level | 3 to 15 foot-candles (fc) |
| Time Delay | 30 to 90 seconds |
| Operating Temperature Range | -40 to 158°F (-40 to 70°C) |
| Housing Material | Polycarbonate |
| Housing Color | Gray |
| Mounting Style | Fixed/Button Mount |
| Product Dimensions | 13/16 × 1-13/16 × 15/16 inches (20.6 × 46 × 23.8 mm) |
| Wire Lead | 18 AWG, 6-inch leads |
| Fail Mode | ON (defaults to energized if circuit fails) |
| Expected Lifespan | 5 years (approximately 3,650 operating hours) |
| Certifications | CA Title 20 |
Typical Applications
- Parking lot and area lighting automation
- Landscape and ornamental lighting control
- Exterior building and facade lighting
- Pedestrian pathway and walkway lighting
- Street lighting and utility applications
- Post lamp and wall pack lighting fixtures
Compatibility & Replacements
Compatible With
- Standard electrical outlet boxes (US 2×4 and similar)
- Post lamps and decorative outdoor fixtures
- Wall-mounted lighting packs
- Fluorescent, high-intensity discharge (HID), and incandescent light sources
- Industrial and commercial outdoor lighting circuits
Replaces / Drop-In Replacement For
The K4035 is a fixed-position photocontrol within the K4000 series. For exact replacement compatibility, consult manufacturer documentation or contact your electrical distributor. Related models in the K4000 series include stem-mount and swivel-mount variants (K4235, K4130) designed for different mounting requirements but using similar photocell and switching technology.
Works With
- AC power distribution systems rated 480V three-phase or single-phase
- Industrial control panels and outdoor lighting circuits
- Facility management and building automation systems
- Standard electrical wiring (18 AWG wire leads with 6-inch termination)
