Why Choose the Finder 11.31.0.024.0001 Twilight Switch?
The Finder 11.31.0.024.0001 is a compact and reliable 16 A light dependent relay (twilight switch) designed for automatic lighting control based on ambient light levels. Operating from a 24 V AC/DC supply, this DIN rail-mounted device automatically switches connected lighting circuits on or off according to the surrounding brightness, providing an efficient solution for commercial, industrial and outdoor lighting installations.
As part of the Finder 11 Series light dependent relay range, the 11.31.0.024.0001 combines adjustable light sensitivity, a high-capacity relay output and an external photosensitive sensor to deliver dependable lighting automation. Its compact 17.5 mm modular housing enables straightforward installation inside electrical distribution boards and control panels, while the separate light sensor allows accurate monitoring of ambient illumination at the required location.
With a 16 A switching capacity at 250 V AC, a single normally open relay contact and adjustable light sensitivity, the Finder 11.31.0.024.0001 is suitable for controlling street lighting, security lighting, building exteriors, car parks and other automated lighting systems. Its integrated switching delays help prevent unnecessary operation caused by temporary changes in light levels, improving system reliability and reducing unwanted switching.
Key Advantages
- Reliable automatic dusk-to-dawn lighting control based on ambient light intensity.
- 24 V AC/DC operating supply suitable for low-voltage building automation and industrial control systems.
- 16 A normally open relay output rated for switching loads at 250 V AC.
- Adjustable 1–100 lx light sensitivity for customised lighting activation thresholds.
- Supplied with a separate external light sensor for flexible installation and accurate ambient light detection.
- Compact 17.5 mm DIN rail-mounted housing saves valuable space inside electrical control panels.
- Integrated switching delays reduce unwanted activation caused by passing shadows, headlights or temporary light fluctuations.
- IP20 relay enclosure with an IP54-rated external sensor for suitable protected outdoor sensor installations.
- Automatic lighting operation helps reduce unnecessary energy consumption and manual intervention.
Key Features
- Finder 11 Series light dependent relay for automatic lighting control.
- 24 V AC/DC rated supply voltage.
- Single-pole normally open (SPST-NO) relay contact.
- 16 A rated switching current at 250 V AC.
- 1–100 lx adjustable light sensitivity.
- 15 s switch-on delay and 30 s switch-off delay.
- External photosensitive sensor supplied with the relay.
- Light feedback compensation technology helps maintain reliable switching where controlled lighting influences the sensor.
- LED indication for operating status.
- 17.5 mm modular width for compact electrical panel installation.
- Standard 35 mm DIN rail mounting in accordance with EN 60715.
- IP20 protection rating for the relay and IP54 protection for the external sensor.
- Designed for an operating temperature range of −20 to +50 °C.
- Durable relay contacts with an electrical life of approximately 100,000 switching cycles under specified rated-load conditions.
Reliable Automatic Lighting Control for Commercial and Industrial Installations
Light dependent relays such as the Finder 11.31.0.024.0001 provide an effective method of automating lighting systems without requiring manual switching or fixed operating schedules. The external photosensitive sensor continuously monitors ambient light levels, allowing the relay to activate connected lighting when brightness falls below the selected threshold and switch it off when sufficient natural light returns.
The adjustable sensitivity range allows installers to configure the switching point according to the lighting requirements of each installation. Built-in operating delays help minimise unwanted switching caused by short-term changes in illumination, such as passing vehicles, moving clouds or temporary shadows. The Finder 11 Series also incorporates light feedback compensation technology to improve switching stability when controlled lighting affects the surrounding brightness.
The 24 V AC/DC supply makes this model particularly suitable for control systems using low-voltage auxiliary supplies, while the 16 A relay contact enables switching of appropriately rated lighting circuits. For installations involving larger loads or substantial LED driver inrush currents, the relay can also be incorporated into a control arrangement using a suitably rated contactor.
Its narrow DIN rail housing provides a practical solution for electrical contractors, building automation engineers and facilities maintenance teams requiring reliable dusk-to-dawn lighting control. The separately mounted sensor allows the light measurement point to be positioned away from the control enclosure, improving installation flexibility.
Typical Applications
- Automatic street lighting and public area illumination.
- Commercial building exterior and façade lighting.
- Car park, driveway and access road lighting.
- Security and perimeter lighting installations.
- Industrial premises and warehouse exterior lighting.
- Garden, pathway and landscape lighting automation.
- Signage, display and architectural lighting systems.
- Building management and energy-saving lighting control.
- Electrical distribution panels and DIN rail control assemblies.
- Industrial and commercial dusk-to-dawn lighting applications.
