Finder 11.31.8.230.0000 is a 110–230 V AC modular light-dependent relay with a 16 A normally open contact, adjustable 1–100 lx sensitivity and timed switching for automatic lighting control.
£47.06
The Finder 11.31.8.230.0000 is a compact and reliable modular light-dependent relay designed to switch lighting automatically according to ambient light levels. Part of the Finder 11 Series, this twilight switch is suitable for energy-efficient lighting control in commercial, industrial and building-services applications.
The relay works with an external photosensor to monitor ambient illumination and operate connected lamps when the selected light threshold is reached. Its adjustable sensitivity range of 1–100 lx allows the switching point to be configured for different environments, helping ensure lighting operates only when required.
Designed for a nominal 110–230 V AC supply, the Finder 11.31.8.230.0000 provides a single normally open 16 A contact. Its slim, single-module enclosure measures only 17.5 mm wide and mounts directly onto a 35 mm DIN rail inside a protected electrical panel.
Light-dependent relays monitor ambient illumination through a remotely positioned photosensor and automatically control connected lighting when the measured level reaches a selected threshold. This provides lighting according to actual environmental conditions and can reduce unnecessary energy use compared with manually controlled installations.
The Finder 11.31 incorporates separate switch-on and switch-off delays to prevent brief changes in illumination from causing unwanted operation. This helps avoid switching triggered by vehicle headlights, lightning, temporary shadows or other short-duration changes in ambient light.
| Manufacturer | Finder |
|---|---|
| Series | 11 Series |
| Model | 11.31.8.230.0000 |
| Product type | Modular light-dependent relay / twilight switch |
| Nominal supply voltage | 110–230 V AC |
| Supply frequency | 50 / 60 Hz |
| Operating voltage range | 90–265 V AC |
| Rated power consumption | 2.5 VA at 50 Hz |
| Contact configuration | 1 normally open contact |
| Rated contact current | 16 A |
| Rated contact voltage | 250 V AC |
| Maximum switching capacity | 4,000 VA AC1 |
| AC15 switching capacity | 750 VA at 230 V AC |
| Incandescent and halogen lamp load | 2,000 W at 230 V AC |
| CFL and LED lamp load | 400 W at 230 V AC |
| Sensitivity adjustment | 1–100 lx |
| Switch-on delay | 15 s |
| Switch-off delay | 30 s |
| Maximum photosensor cable distance | 50 m |
| Operating temperature | −20 to +50 °C |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | 88.8 × 17.5 × 60.8 mm |
| Applicable standards | EN 60669-1 and EN 60669-2-1 |
This light-dependent relay automatically switches connected lighting according to the ambient illumination measured by an external photosensor.
The Finder 11.31.8.230.0000 has a nominal supply range of 110–230 V AC at 50 / 60 Hz.
The switching threshold is adjustable between 1 and 100 lx, allowing the relay to be configured for different lighting conditions.
The relay provides one normally open contact rated at 16 A and 250 V AC, with a maximum AC1 switching capacity of 4,000 VA.
The relay should be mounted on a 35 mm DIN rail inside a protected electrical panel, with the external photosensor positioned where it can accurately monitor ambient light without being affected by the controlled lamps.
Finder 11 Series light-dependent relays provide dependable and energy-efficient lighting control through adjustable light sensing, delayed switching and compact modular construction.{ "@context": "https://schema.org/", "@type": "Product", "name": "Finder 11.31.8.230.0000 Light-Dependent Relay 110–230 V AC", "sku": "11.31.8.230.0000", "mpn": "11.31.8.230.0000", "brand": { "@type": "Brand", "name": "Finder" }, "category": "Light-Dependent Relays", "description": "Finder 11.31.8.230.0000 is a 110–230 V AC modular light-dependent relay with a 16 A normally open contact, adjustable 1–100 lx sensitivity and timed switching for automatic lighting control.", "additionalProperty": [ { "@type": "PropertyValue", "name": "Supply voltage", "value": "110–230 V AC" }, { "@type": "PropertyValue", "name": "Contact configuration", "value": "1 normally open contact" }, { "@type": "PropertyValue", "name": "Rated contact current", "value": "16 A" }, { "@type": "PropertyValue", "name": "Sensitivity adjustment", "value": "1–100 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 11.31.8.230.0000 used for?", "acceptedAnswer": { "@type": "Answer", "text": "This light-dependent relay automatically switches connected lighting according to the ambient illumination measured by an external photosensor." } }, { "@type": "Question", "name": "What supply voltage does this relay require?", "acceptedAnswer": { "@type": "Answer", "text": "The Finder 11.31.8.230.0000 has a nominal supply range of 110–230 V AC at 50 / 60 Hz." } }, { "@type": "Question", "name": "What light threshold can be selected?", "acceptedAnswer": { "@type": "Answer", "text": "The switching threshold is adjustable between 1 and 100 lx, allowing the relay to be configured for different lighting conditions." } }, { "@type": "Question", "name": "What is the output contact rating?", "acceptedAnswer": { "@type": "Answer", "text": "The relay provides one normally open contact rated at 16 A and 250 V AC, with a maximum AC1 switching capacity of 4,000 VA." } }, { "@type": "Question", "name": "Where should the Finder 11.31 be installed?", "acceptedAnswer": { "@type": "Answer", "text": "The relay should be mounted on a 35 mm DIN rail inside a protected electrical panel, with the external photosensor positioned where it can accurately monitor ambient light without being affected by the controlled lamps." } } ] }
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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...