Modular photo relay | twilight switch with external sensor | 16 A | 12–240 V AC/DC | 1–50,000 lx | 1CO | DIN | GanzKK | SOU-1/UNI

Modular photo relay | twilight switch with external sensor | 16 A | 12–240 V AC/DC | 1–50,000 lx | 1CO | DIN | GanzKK | SOU-1/UNI 1

Modular photo relay | twilight switch with external sensor | 16 A | 12–240 V AC/DC | 1–50,000 lx | 1CO | DIN | GanzKK | SOU-1/UNI 2

Modular photo relay | twilight switch with external sensor | 16 A | 12–240 V AC/DC | 1–50,000 lx | 1CO | DIN | GanzKK | SOU-1/UNI

Name: Modular photo relay | twilight switch with external sensor | 16 A | 12–240 V AC/DC | 1–50,000 lx | 1CO | DIN | GanzKK | SOU-1/UNI
SKU: SOU-1/UNI
Price: 42.47 EUR
Availability: InStock

Code: SOU-1/UNI

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Price 42.47 € VAT incl.

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DIN rail twilight switch with universal 12–240 V AC/DC supply and external sensor: 1–50,000 lx, 1CO 16 A AC1, 0–2 min delay, 1 module.

Product description

Modular photo relay with external sensor | 16 A | 1–100 lx | VEXEN TWR1

SOU-1/UNI is a twilight switch that switches its output according to real illuminance and can be supplied with any voltage from 12 to 240 V – AC or DC. The relay is mounted in the panel on a DIN rail (1 module), while light is measured by an external sensor mounted outdoors on a wall. Two ranges – 1–100 lx and 100–50,000 lx.

Key point:
The universal supply lets you use the same relay where 230 V AC is not available or the control circuit is low voltage: in 12 V and 24 V DC systems, solar and battery installations, and automation panels with a 24 V supply. The 1CO contact switches up to 16 A AC1 or up to 384 W at 24 V DC.

Supply
12–240 V AC/DC

Sensitivity
1–50,000 lx (2 ranges)

Output
1CO, 16 A AC1

Delay
0–2 min, adjustable

Mounting
1 module, DIN rail

Operating principle

The external sensor continuously measures illuminance. When light falls below the set threshold, the relay switches output contact 15–16–18 and turns the load on; when light rises above the threshold plus hysteresis, the contact returns to its initial position.

A selector chooses range LUX1 (1–100 lx) or LUX2 (100–50,000 lx), and the exact threshold is set with a knob. The 0–2 min delay prevents the relay from reacting to car headlights or a passing cloud.

Input S is used for additional control, e.g. a timer blocking the lighting at night. In the TEST position the output is forced on – this checks the load connection. A green LED shows supply, a red LED shows an active output.

Why 12–240 V AC/DC?
Farmsteads with solar panels and batteries, garden houses, campsites, telecom and security cabinets often have only 12 V or 24 V DC. An ordinary 230 V AC photo relay will not work there, while the UNI version is supplied directly from the same system and controls, e.g., 12/24 V LED lighting without a converter.

Technical specifications

Product type	Modular twilight switch (photo relay) with external sensor
Manufacturer / model	GanzKK (Hungary) SOU-1/UNI
Supply voltage	12–240 V AC/DC (AC 50–60 Hz), −15 % / +10 %, terminals A1–A2
Output	1 changeover contact (1CO), terminals 15–16–18
Contact material	AgSnO₂
Switching current	16 A (AC1), inrush current 30 A (< 3 s)
Switching capacity	4000 VA (AC1), 384 W (DC)
Switching voltage	250 V AC / 24 V DC
Light sensitivity range	1–50,000 lx: LUX1 1–100 lx and LUX2 100–50,000 lx
Switching delay	0–2 min, adjustable; with hysteresis
Control input S	additional control / blocking, e.g. by a timer
Modes	LUX1 / LUX2 / TEST
Indication	green LED – supply, red LED – output
Sensor	external, with holder for wall mounting
Sensor cable	up to 50 m (standard wire)
Terminals	screw; solid wire up to 1 × 2.5 mm² or 2 × 1.5 mm²; with ferrule up to 1 × 2.5 mm²
Mechanical / electrical life	1 × 10⁷ / 0.7 × 10⁵ cycles (AC1)
Protection rating	IP40 from the front panel, IP20 terminals
Dimensions	90 × 17.6 × 64 mm, 1 module
Mounting	DIN rail (EN 60715), any position
Operating temperature	−20…+55 °C (storage −30…+70 °C)
Overvoltage category / pollution degree	III / 2

Main functions

Universal supply 12–240 V AC/DC – one relay for 12 V, 24 V, 48 V and 230 V circuits.
Two sensitivity ranges – 1–100 lx for dusk and 100–50,000 lx for daylight.
1CO changeover contact – a circuit can be switched on at dusk or during daylight.
Adjustable delay 0–2 min – short light changes do not switch the output.
Input S and TEST position – blocking by a timer and a quick load check.
Sensor cable up to 50 m – the sensor can be mounted far from the panel.

How does it differ from similar models?

Eti SOU-1 – The same function and ranges, but 230 V AC supply only; IP65 sensor included.
VEXEN VSOU-1 – 1–50,000 lx, 1CO 16 A and input S, 230 V AC supply, IP56 sensor.
VEXEN TWR1 – 110–240 V AC supply (no DC), 1–100 lx only and a 1NO contact – for simple outdoor lighting.
ES-TS01 – AC 24–264 V supply, 16 A, 1NO – a wide voltage range, but AC only; not suitable for DC systems.

Where is it used?

Farmsteads and garden houses with solar panels and batteries
12/24 V DC LED lighting for yards, paths and signs
Automation panels with a 24 V AC/DC control circuit
Telecom, security and CCTV cabinets
Standard 230 V outdoor lighting – when one model is wanted for all sites
Control of blinds and shading by daylight

Use by need

For the electrician.
One model in stock instead of several – suitable for 12 V, 24 V and 230 V sites, no need to pick a relay by control voltage.

For the farmstead or garden house owner.
12/24 V LED lighting of a solar system switches on at dusk without a converter or an additional 230 V grid.

For the company or farm manager.
In automation panels with 24 V control the relay is connected directly to the existing supply – a simpler circuit and fewer devices.

Practical use

If a garden house has a 24 V DC solar system with a battery and the path LED luminaires (about 100 W) must light up at dusk, supply SOU-1/UNI directly from 24 V DC. Fix the sensor on the north wall, select LUX1, a threshold of about 10 lx and a delay of about 1 min. Connect the luminaires via contact 15–18. At 24 V DC a 100 W load draws about 4.2 A, well below the 384 W DC limit.

Pros

Universal supply 12–240 V AC/DC
Wide range 1–50,000 lx (two sub-ranges)
1CO changeover contact 16 A AC1, up to 384 W DC
Adjustable delay 0–2 min
Input S and TEST position
Only 1 module on the DIN rail

Cons / limitations

The contact switches DC voltage up to 24 V DC only; for higher DC voltage loads use an interposing relay or a contactor
16 A is rated for AC1 (resistive) load – for LED drivers with high inrush current use a modular contactor
No built-in timer – night-time switch-off requires a timer on input S

⚠ Safety and installation notes

Mount the sensor where daylight reaches it but the controlled luminaires do not – otherwise the relay will start switching itself off.
The relay housing is intended for a panel (IP40 from the front, IP20 terminals) – only the sensor is installed outdoors.
In the UNI version, illuminated push buttons (with glow lamps) must not be connected to input S.
In DC circuits observe the 24 V DC switching voltage limit and protect the circuit with a DC fuse or circuit breaker.
Sensor cable up to 50 m; do not route it together with power cables.
Installation must be carried out by a qualified electrician after disconnecting and verifying the absence of voltage.

Quick selection guide

12–240 V AC/DC

1–50,000 lx

1CO 16 A AC1

1 DIN module

Suitable when you need to:

a photo relay for a 12 V or 24 V AC/DC system, a solar or battery installation;
one model for sites with different control voltages;
a changeover contact and control both at dusk and by daylight.

Check before use:

the supply voltage and whether the controlled DC load stays within 24 V DC / 384 W;
load type and inrush current (LED – via a contactor);
where the sensor will be mounted and whether the cable stays within 50 m.

Important reminder: a photo relay controls lighting by light level, but it does not replace protective devices; in DC circuits use fuses or circuit breakers rated for DC.

☝ Elsprendimai.eu recommends:

Modular contactors – when the LED or floodlight group exceeds the relay's capability.
Modular time relays – a timer on input S to switch lighting off at night.
Photo relays and twilight switches – all twilight switches in one place.

FAQ

Can the relay be supplied from a 12 V battery?
Yes – the supply range is 12–240 V AC/DC with −15 % tolerance, so 12 V and 24 V DC systems are suitable.

Can the contact switch 12/24 V DC LED lighting?
Yes, up to 24 V DC and 384 W. For higher power or higher DC voltage use a contactor or an interposing relay.

Is it suitable for standard 230 V lighting?
Yes – the relay also runs on 230 V AC, and the contact switches up to 16 A AC1.

Which range should I choose?
For outdoor lighting – LUX1 (1–100 lx); for blinds and daylight-based control – LUX2 (100–50,000 lx).

What does IP20 in product names mean?
It is the protection of the relay terminals in the panel (front panel – IP40). Only the external sensor is installed outdoors.

How far can the sensor be?
Up to 50 m from the relay, using a standard wire.

Modular photo relay with universal supply | 12–240 V AC/DC | 1–50,000 lx | SOU-1/UNI

SOU-1/UNI is a modular twilight switch with a universal 12–240 V AC/DC supply, an external sensor, two ranges of 1–100 lx and 100–50,000 lx, a 1CO 16 A AC1 changeover contact, a 0–2 min delay, input S and a TEST position. Suitable for 12/24 V, solar and battery systems as well as standard 230 V lighting.

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.

IP protection class values

The IP protection class indicates the device's resistance to environmental factors.

The first digit indicates protection against dust and solid objects.
The second digit indicates protection against moisture.

First digit values:

X — Untested;
0 — No protection;
1 — Protected against solid objects larger than 50 mm;
2 — Protected against solid objects larger than 12.5 mm;
3 — Protected against solid objects larger than 1 mm;
4 — Protected against solid objects larger than 1 mm;
5 — Dust protected;
6 — Totally dustproof.
Second digit values:

X — Untested;
0 — No protection;
1 — Protected against vertically falling water drops;
2 — Protected against water drops falling at a 15º angle;
3 — Protected against rain falling at a 60º angle;
4 — Protected against water splashes;
5 — Protected against water jets;
6 — Protected against large amounts of water;
7 — Protected against short-term immersion in water up to 1 meter deep;
8 — Protected against long-term immersion in water up to 3 meters deep.

CE certificate – a guarantee of safety, quality, and compliance

This product is marked with the CE label, which confirms that it complies with all applicable European Union directives and regulations. CE marking is not just a formality – it is an important indicator of quality and safety, ensuring that the product has been properly assessed, tested, and can be safely used throughout the EU market.

CE certification means that the product has been evaluated according to the main criteria:

Safety requirements – ensures that the product does not pose a risk to the user or the environment
Electromagnetic compatibility (EMC) – the device does not interfere with other equipment and is resistant to external disturbances
Environmental standards – complies with current ecological and material usage requirements
Operational reliability – the product is suitable for long-term use according to its intended purpose

CE marking allows this product to:

be legally supplied and used in all European Union countries
ensure a high level of quality and safety
be used in residential, commercial, and industrial environments

The CE mark is a declaration of the manufacturer’s responsibility, confirming that the product complies with all applicable standards and has been assessed according to EU legislation.

What does this mean for you as a buyer?

Safe use in everyday activities
Reliable performance and reduced risk of failure
Compliance with EU standards and requirements
Suitability for professional solutions