Helvar 444D2 Mini Input Unit (DALI-2) – DALI-2 Certified

444D2 Technical Data

444D2 Connections

Inputs: 4 inputs (active low)
COM: input ground
Overload protection: -0.3 to +3.6 V
Short-circuit current: 0.5 mA maximum
Debounce period: 50 ms
Voltage-free switched inputs: 3.3 V nominal with switch open, must be less than 0.3 V with switch closed.

Cable requirements

DALI: DALI Ribbon cable terminated with 1.2 mm ferrules
Cable length: 170 mm Note: Do not increase the length of the wires. This can cause interference problems.

444D2 Electrical data

DALI supply input: 12–22.5 V
DALI Consumption: 10 mA
Isolation: No isolation from DALI network: Switches must provide supplementary isolation for 250 V.

Operating and storage conditions

Ambient temperature: 0 °C to +40 °C
Relative humidity: Max. 90 %, noncondensing
Storage temperature: –10 °C to +70 °C

444D2 Mechanical data

Dimensions: Encapsulated printed circuit board
Mounting: For installation in a suitably enclosed location only.
Weight: 10 g
IP rating: IP20

Conformity and standards

Conformity: CE UK CA
EMC emission: EN 55015
EMC immunity: EN 61547
DALI: IEC 62386, Parts 101, 103 and 301
Safety: EN 61347-2-11
Environment: Complies with WEEE, RoHS and REACH directives

Compatibility

Device: 950 Application Controller
Designer: 5.8.4 or later

DALI Input Units are interface devices (often compact,, back-box mounted modules) that bridge standard third-party components—like push-buttons, switches, and motion sensors—into a digital DALI lighting system. They convert mechanical switch closures into DALI commands (on/off, dim, scenes). Key benefits include:

Integration: Connects standard switches to intelligent DALI systems.

Power: Typically powered directly from the DALI bus.

Multi-Input: Often supports 4+ inputs per unit.

Installation: Small,, suitable for back-boxes.

Versatility: Ideal for commercial spaces requiring local control.

Functionality: They allow, for instance, a standard wall switch to send messages to the DALI system, enabling it to act as a scene selector or simple dimmer. DALI-2/Compatibility: While some are simple interfaces, modern DALI-2 Input Units are certified and part of the DALI-2 standard, enabling robust, multi-master communication.

Types:

Switch Interfaces: Commonly used for standard, momentary, or rocker switches to control lighting groups or scenes.

Sensor Inputs: Used to bring presence detectors or light sensors into the DALI network.

Power & Installation: They are typically low power (e.g., < 9 mA). Some specialized units, like the PCU Input unit, can also handle, for instance, the power supply for a small number of DALI devices.

Flexibility: They are indispensable for retrofitting standard electrical, non-DALI components into a modern digital,, addressable lighting system.

At Helvar they create intelligent and energy-saving lighting solutions.

Their Intelligent lighting is essential for the wellbeing of employees, customers, visitors, patients… and you! By combining smart data and reporting tools, and working together seamlessly with other manufacturers systems, Helvar’s solutions help to create smart environments built for the future.

Their products are regarded as best-in-class for reliability, compatibility and flexibility. With an extensive selection of advanced lighting solutions and components, they are unmatched when it comes to saving energy and enhancing comfort and mood.

From providing remote monitoring and maintenance, to using data to predict energy savings or to lower running costs by integrating to other building systems, their service offerings support buildings throughout their entire life cycle.

The company was originally set up in 1921 by Mr Walter Grueling and Mr Bengt Nybom. A century later, Helvar Oy Ab is now one of the global leaders in intelligent lighting solutions, with a world-class hybrid offering of wired- and wireless- control solutions, as well as a powerful platform of digital services.

Their mission is to Turn Everyday Places into Brighter Spaces; spaces which are perfectly functional, intelligent and designed for the future. Helvar is headquartered in Finland, with regional offices in Sweden and the United Kingdom, and we work closely with a network of over 80 expert partners across the world.

Helvar’s luminaire components division now operates as an independent manufacturer, producing world-class LED drivers and lighting components under the Helvar Components name.
As the company ventures into the next 100 years, the ‘Helvar spirit’ continues to live on– combining a passion for sustainability, customer closeness, a hardworking attitude and first-class industrial know-how into an ever-growing and successful team.