Why Choose the Finder 11.91.8.230.0000 Light-Dependent Relay?
The Finder 11.91.8.230.0000 is an advanced programmable light-dependent relay with an integrated time switch, designed to control lighting automatically according to the measured ambient light level. As part of the Finder 11 Series, it combines light-sensitive switching, daily scheduling and a separate external light sensor within a compact DIN rail-mounted device.
An adjustable switching threshold of 1–150 lx allows the relay to operate connected lighting at the required ambient brightness level. Its programmable daily time-switch function can inhibit the main output during selected periods, helping reduce unnecessary lighting operation and energy consumption.
The Finder 11.91.8.230.0000 operates from a 110–230 V AC/DC supply and provides one changeover contact rated at 16 A at 250 V AC. An LCD display, joystick control and light feedback compensation support accurate configuration and dependable automatic lighting control.
Key Advantages
- Automatically controls lighting according to ambient light levels.
- Adjustable 1–150 lx switching threshold supports precise configuration.
- Integrated daily time switch can inhibit lighting during programmed periods.
- 16 A changeover contact supports a wide range of lighting loads.
- Separate external light sensor enables accurate ambient light measurement.
- LCD display and joystick control simplify programming and monitoring.
Key Features
- Finder 11.91 programmable light-dependent relay.
- 110–230 V AC/DC rated supply voltage.
- One changeover contact rated at 16 A, 250 V AC.
- Adjustable ambient light threshold from 1–150 lx.
- Integrated daily time-switch function.
- Built-in light feedback compensation.
- Auxiliary output rated at 12 V DC, maximum 1 W.
- Separate light sensor with a maximum connection distance of 50 m.
- LCD display with joystick-based controls.
- Compact 35 mm DIN rail-mounted format.
Automatic Lighting Control Based on Ambient Light
Light-dependent relays monitor ambient brightness through a remote photosensor and switch connected lighting when the measured level crosses a configured threshold. The Finder 11.91 includes switch-on and switch-off delays that help prevent unwanted operation caused by brief changes in light, such as vehicle headlights or temporary shadows.
The integrated daily time switch adds scheduled control to the light-sensitive operation, allowing the main output to remain disabled during periods when lighting is not required. Light feedback compensation also helps prevent connected lamps from affecting the sensor measurement, supporting stable and efficient lighting control.
Typical Applications
- Street and public-area lighting.
- Commercial exterior lighting.
- Car parks and access routes.
- Building perimeter and security lighting.
- Shop signs and illuminated displays.
- Garden, pathway and landscape lighting.
