Finder 11.91.8.230.0000 is a programmable 110–230 V AC/DC light-dependent relay with a daily time switch, adjustable 1–150 lx threshold, separate sensor and 16 A changeover output for automatic lighting control.
£76.76
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.
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.
| Manufacturer | Finder |
|---|---|
| Series | 11 Series |
| Model | 11.91.8.230.0000 |
| Product type | Programmable light-dependent relay with time switch |
| Rated supply voltage | 110–230 V AC/DC |
| AC supply frequency | 50 / 60 Hz |
| Operating voltage range | 88–253 V AC/DC |
| Rated power | 5 VA at 50 Hz / 2.1 W |
| Contact configuration | 1 CO (SPDT) |
| Contact rating | 16 A at 250 V AC |
| AC1 switching capacity | 4000 VA |
| AC15 switching capacity | 750 VA at 230 V AC |
| CFL / LED lamp load | 400 W at 230 V AC |
| Light threshold adjustment | 1–150 lx |
| Switch-on delay | 25 s |
| Switch-off delay | 50 s |
| Auxiliary output | 12 V DC, maximum 1 W |
| Maximum sensor cable length | 50 m |
| Protection rating | IP20 |
| Operating temperature | −20 to +50 °C |
| Mounting type | 35 mm DIN rail |
| Dimensions (W × H × D) | 35 × 88.8 × 60.8 mm |
| Applicable standards | EN 60669-1 and EN 60669-2-1 |
It automatically switches lighting according to the measured ambient light level and can inhibit the output during programmed periods using its integrated daily time switch.
The Finder 11.91.8.230.0000 has a rated supply voltage of 110–230 V AC/DC.
The ambient light switching threshold can be adjusted between 1 and 150 lx.
It provides one changeover contact rated at 16 A at 250 V AC.
The relay mounts on a 35 mm DIN rail and operates with a separate external light sensor that can be connected at a distance of up to 50 m.
Finder 11 Series light-dependent relays provide electricians, building-services engineers and system integrators with dependable automatic lighting control, flexible programming and efficient DIN rail installation.{ "@context": "https://schema.org/", "@type": "Product", "name": "Finder 11.91.8.230.0000 Programmable Light-Dependent Relay 16 A", "sku": "11.91.8.230.0000", "mpn": "11.91.8.230.0000", "brand": { "@type": "Brand", "name": "Finder" }, "category": "Light-Dependent Relays", "description": "Finder 11.91.8.230.0000 is a programmable 110–230 V AC/DC light-dependent relay with a daily time switch, adjustable 1–150 lx threshold, separate sensor and 16 A changeover output for automatic lighting control.", "additionalProperty": [ { "@type": "PropertyValue", "name": "Supply voltage", "value": "110–230 V AC/DC" }, { "@type": "PropertyValue", "name": "Contact configuration", "value": "1 CO (SPDT)" }, { "@type": "PropertyValue", "name": "Contact rating", "value": "16 A at 250 V AC" }, { "@type": "PropertyValue", "name": "Light threshold", "value": "1–150 lx" }, { "@type": "PropertyValue", "name": "Protection rating", "value": "IP20" } ] } { "@context": "https://schema.org", "@type": "FAQPage", "inLanguage": "en-GB", "mainEntity": [ { "@type": "Question", "name": "What is the Finder 11.91.8.230.0000 used for?", "acceptedAnswer": { "@type": "Answer", "text": "It automatically switches lighting according to the measured ambient light level and can inhibit the output during programmed periods using its integrated daily time switch." } }, { "@type": "Question", "name": "What supply voltage does this relay require?", "acceptedAnswer": { "@type": "Answer", "text": "The Finder 11.91.8.230.0000 has a rated supply voltage of 110–230 V AC/DC." } }, { "@type": "Question", "name": "What is the adjustable light threshold range?", "acceptedAnswer": { "@type": "Answer", "text": "The ambient light switching threshold can be adjusted between 1 and 150 lx." } }, { "@type": "Question", "name": "What output contact does the relay provide?", "acceptedAnswer": { "@type": "Answer", "text": "It provides one changeover contact rated at 16 A at 250 V AC." } }, { "@type": "Question", "name": "How is the Finder 11.91 installed?", "acceptedAnswer": { "@type": "Answer", "text": "The relay mounts on a 35 mm DIN rail and operates with a separate external light sensor that can be connected at a distance of up to 50 m." } } ] }
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...