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  • New item   Modular photo relay | twilight switch with timer and external sensor | 16 A | 230 V AC | 2–150 lx | 1CO | IP54 sensor | DIN | Finder | 11.91.8.230.0000

    Modular photo relay | twilight switch with timer and external sensor | 16 A | 230 V AC | 2–150 lx | 1CO | IP54 sensor | DIN | Finder | 11.91.8.230.0000

    Code: 11.91.8.230
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    Price 76.00 € VAT incl.
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    DIN rail twilight switch with digital daily timer and LCD: 2–150 lx, 1CO 16 A, LED up to 400 W, 011.02 sensor (IP54) included.

  • Product description

    Modular photo relay with timer and external sensor | 16 A | 2–150 lx | Finder 11.91

    Finder 11.91 is a twilight switch with a built-in digital timer. It switches lighting on at dusk, while the timer can switch it off at night and on again before dawn. The relay is mounted in the panel on a DIN rail (35 mm, 2 modules); light is measured by the external Finder 011.02 sensor (IP54), which is included.

    Key point:
    A simple photo relay keeps lighting on all night, although after midnight nobody often needs it. Finder 11.91 combines a light sensor and a timer in one device: lighting is on only when it is dark and actually needed, and the battery-backed clock does not lose time during a power failure.
    Sensitivity
    2–150 lx
    Output
    1CO, 16 A AC1
    LED load
    up to 400 W (230 V AC)
    Timer
    daily program, 5-year back-up
    Mounting
    35 mm (2 modules), DIN

    Operating principle

    The external 011.02 sensor measures illuminance. When light falls below the set threshold, the relay switches the lighting on after 25 s; when it gets light, it switches off after 50 s. A 3 lx hysteresis and the delays prevent chattering caused by car headlights or a passing cloud.

    Finder's patented “light feedback compensation” principle takes into account that light from the controlled luminaires may also reach the sensor (up to 200 lx combined illuminance). This prevents the lighting from “hunting” between on and off because of a less than ideal sensor position.

    The timer offers three operating options: light only; light with a switch-off time (e.g. no lighting after 22:00); light with switch-off and switch-on times (e.g. no lighting from 1:00 to 5:00). In manual mode the output can be forced permanently on or off. Everything is set with buttons and shown on the LCD.

    Why a timer in a photo relay?
    Yard, signage or car park lighting often burns for nothing after midnight. The timer switches it off at a set time and, if needed, on again early in the morning – but only while it is still dark. Summer/winter time changes automatically, and the internal battery keeps time and program for up to 5 years.

    Technical specifications

    Product type Modular twilight switch (photo relay) with digital timer and external sensor
    Manufacturer / model Finder 11.91.8.230.0000
    Supply voltage 230 V AC, 50/60 Hz
    Output 1 × CO (SPDT, change-over contact) + auxiliary output
    Rated / maximum peak current 16 A / 30 A (inrush 120 A, 5 ms)
    Rated / maximum switching voltage 250 V / 400 V AC
    Rated load AC1 / AC15 4000 VA / 750 VA (230 V AC)
    Incandescent and halogen lamps 230 V AC 2000 W
    Fluorescent lamps 1000 W (electronic ballast), 750 W (electromagnetic ballast)
    LED and compact fluorescent lamps 230 V AC 400 W
    Low-voltage halogen / LED lamps 400 W (electronic transformer), 800 W (electromagnetic)
    Auxiliary output 12 V DC, max. 1 W – driven directly by the sensor
    Light sensitivity range 2–150 lx, hysteresis 3 lx
    Switch-on / switch-off delay 25 s / 50 s
    Timer daily program: switch-off time or switch-off and switch-on times; automatic summer/winter time change
    Modes automatic by light (with or without timer), manual permanent ON / permanent OFF
    Back-up supply internal CR2032 battery, time and program kept for up to 5 years
    Indication and control LCD display, buttons
    Sensor Finder 011.02 included, IP54, cadmium-free, operating temperature −40…+70 °C
    Sensor cable up to 50 m (2 × 1.5 mm²)
    Insulation 4000 V AC supply–contacts, 2000 V AC supply–sensor
    Electrical life 100 × 10³ cycles at AC1 load
    Protection rating IP20 relay, IP54 sensor
    Width 35 mm (2 modules)
    Mounting 35 mm DIN rail (EN 60715)
    Operating temperature −20…+50 °C

    Main functions

    • Automatic switch-on at dusk – lighting is on only when it is dark.
    • Night-time switch-off by timer – lighting is switched off at a set time and, if needed, on again before dawn.
    • Light feedback compensation – fewer false switchings when light from the controlled luminaires reaches the sensor.
    • 16 A change-over contact – LED up to 400 W, incandescent up to 2000 W directly.
    • Manual ON / OFF – lighting can be switched on or off without reprogramming.
    • 5-year battery – time and program survive a power failure, programming is possible without supply.

    How does it differ from similar models?

    • VEXEN DTWR972 – Also a digital relay with a daily program and a 1CO contact, but with a wider light range and an LED load of only up to 200 W (Finder 11.91 – up to 400 W).
    • VEXEN TWR1 – A simpler relay without timer: 1–100 lx, 1NO, 1 module – when switching on at dusk and off at dawn is enough.
    • Eti SOU-1 – Photo relay without timer with a wide 1–50,000 lx range – when the threshold may also be in daylight.
    • Finder 011.02 – Not a relay but a spare external IP54 sensor – fits Finder 11 series relays when the original sensor is damaged or lost.

    Where is it used?

    • Yard, path and driveway lighting with night-time switch-off
    • Car park and filling station area lighting
    • Illuminated signs and shop windows to be switched off after business hours
    • Facade and building outline lighting
    • Floodlights at industrial sites, warehouses and farms
    • Yard and entrance lighting of apartment buildings
    • Replacing old photo relays and separate timers with one device

    Use by need

    For the electrician.
    One device instead of a photo relay and a timer: less panel space, fewer connections, sensor already included.
    For the home or farmstead owner.
    The yard is lit in the evening, luminaires are not wasted at night, and the time is not lost after a power cut.
    For the company or farm manager.
    Site and signage lighting is on only during the hours needed – lower electricity costs without manual work.

    Practical use

    If a shop sign and car park floodlights burn all night, Finder 11.91 solves it. Mount the relay in the panel and the 011.02 sensor on the north wall where the floodlights do not light it. Set the threshold to about 10 lx, the switch-off time to 23:00 and the switch-on time to 5:30. In winter the lighting switches on at dusk, goes off at 23:00 and comes on again in the morning until daylight; in summer, when it is already light in the morning, it does not switch on.

    Pros

    • Photo relay and timer in one device
    • 16 A change-over contact (1CO)
    • Manufacturer-stated loads: LED up to 400 W, incandescent up to 2000 W
    • 011.02 sensor (IP54) included, cable up to 50 m
    • Automatic summer/winter time, battery up to 5 years
    • Light feedback compensation

    Cons / limitations

    • Takes 2 modules (35 mm) on the DIN rail
    • LED load limited to 400 W – for larger LED or floodlight groups use a modular contactor
    • Range up to 150 lx – for control by bright daylight choose Eti SOU-1 or VEXEN VSOU-1
    • Daily timer program – different times for individual weekdays cannot be set

    ⚠ Safety and installation notes

    • Mount the sensor where daylight reaches it, but not direct light from the controlled luminaires or car headlights.
    • Do not point the sensor south into direct sun.
    • The relay is intended for a panel (IP20) – only the sensor (IP54) is installed outdoors.
    • Sensor cable up to 50 m, e.g. H07RN-F 2 × 1.5 mm²; do not run it together with power cables over long routes.
    • When the LED load exceeds 400 W or inrush current is high, the relay must control a contactor coil.
    • Installation must be carried out by a qualified electrician after disconnecting and verifying the absence of voltage.

    Quick selection guide

    2–150 lx
    1CO 16 A
    LED up to 400 W
    Timer + battery
    Suitable when you need to:
    • switch outdoor lighting on automatically at dusk and off at night;
    • replace a photo relay and a timer with one device;
    • keep time and program after a power failure.
    Check before use:
    • load type and power (LED up to 400 W, more – via a contactor);
    • whether there are 2 free modules in the panel;
    • where the sensor will be mounted and that the cable does not exceed 50 m.
    Important reminder: the timer works together with the light sensor – during the night-time switch-off the lighting will not come on even in darkness, so choose the times according to the site's safety needs.
    ☝ Elsprendimai.eu recommends:

    FAQ

    Is the sensor included?
    Yes, the external Finder 011.02 sensor (IP54) is supplied with the relay.
    How much LED lighting can be connected directly?
    The manufacturer states up to 400 W LED at 230 V AC. For a larger load use a modular contactor.
    Is the timer weekly?
    No, the program is daily: a switch-off time or switch-off and switch-on times that repeat every day.
    What happens after a power failure?
    The internal battery keeps time and program for up to 5 years, so no resetting is needed.
    How far can the sensor be mounted?
    Up to 50 m from the relay, using a 2 × 1.5 mm² cable.
    What if the sensor fails?
    A spare Finder 011.02 sensor is available separately.

    Modular photo relay with timer | 2–150 lx | 16 A | Finder 11.91.8.230.0000

    Finder 11.91 is a modular twilight switch with a digital daily timer, LCD and the external 011.02 sensor (IP54) included. 2–150 lx threshold, 16 A change-over contact, LED up to 400 W and a battery for up to 5 years – for yard, site and signage lighting that must be switched off at night.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

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