theben DM 4-2 T KNX 4-Way Universal Dimmer Actuator (4940280)

Description

Introduction

The theben DM 4-2 T KNX (Item no.: 4940280) is a 4-way universal dimmer actuator designed for FIX1 DIN rail installation in modern KNX building automation systems. Operating on KNX bus voltage with a current consumption of 10 mA or less, this 4-channel actuator controls lighting circuits powered at 230 V AC – 240 V AC at 50 Hz – 60 Hz. This device is part of our KNX automation components range.

Engineered for versatile lighting control, the unit supports incandescent lamps, low-voltage and high-voltage halogen loads, dimmable energy-saving lamps, and LED light sources. With an energy-efficient stand-by consumption of less than 1 W and screw terminal connectivity, it provides installers and system integrators with a reliable lighting control solution.

Key Features

• 4-channel universal dimming actuator in FIX1 design for DIN rail mounting.
• KNX bus operating voltage with bus current draw of ≤10 mA.
• Main operating voltage range of 230 V AC to 240 V AC at 50 Hz to 60 Hz.
• Protection class II according to EN 60 669 standard specifications.
• Accommodates solid wire cross sections from 0.5 mm² to 6 mm² and stranded wire with end sleeves from 0.5 mm² to 4 mm².
• Maximum cable length capacity up to 100 meters.
• Minimum switching capacity rating of 2.

Benefits

• Flexible lighting control across 4 independent dimming channels.
• Broad load compatibility supporting LED, incandescent, halogen, and energy-saving lamps.
• Low stand-by power consumption of less than 1 W for improved energy efficiency.
• Simplified DIN rail mounting and connection via terminal screws and standard KNX bus terminals.
• Wide operational ambient temperature range spanning from -5°C to 45°C.
• Trailing edge (RC-mode) support up to 200 W for dimmable energy-saving light sources.

Technical Specifications

Specification	Value
Operating voltage KNX	Bus voltage, ≤10 mA
Operating voltage	230 V AC – 240 V AC, 50 Hz – 60 Hz
Frequency	50 – 60 Hz
Lamp types	Incandescent, low-voltage and high-voltage halogen and dimmable energy saving lamps and LED
Incandescent/halogen lamp load	200
Energy saving lamps	Trailing edge (RC-mode): 200 W
Stand-by consumption	<1 W
Max. cable cross section	Solid wire: 0.5 mm² (Ø 0.8) to 6 mm² | Stranded wire with end sleeve: 0.5 mm² to 4 mm²
Number of channels	4
Hand book	PDF
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Width	4
Max. cable length	100
Installation type	DIN rail
Protection class	II according to EN 60 669
Type of connection	Terminal screws | Bus connection: KNX bus terminal
Switching capacity min.	2
Ambient temperature	-5°C … 45°C

Applications

• DIN rail lighting distribution enclosures using KNX automation networks.
• Architectural dimming for dimmable LED, halogen, and energy-saving loads across 4 individual channels.

Installation Notes

• Mount the device onto a standard DIN rail in accordance with FIX1 mounting specifications.
• Connect the main operating voltage of 230 V AC – 240 V AC (50 Hz – 60 Hz) and load circuits to the terminal screws.
• Attach the KNX bus connection using the dedicated KNX bus terminal while verifying bus current remains ≤10 mA.
• Ensure wiring matches required cross sections: solid wire 0.5 mm² to 6 mm² or stranded wire with end sleeve 0.5 mm² to 4 mm².

Developer Resources

• Data sheet (PDF) providing official technical specification details.
• Handbook (PDF) containing operational guidelines for commissioning.
• CE declaration of conformity (PDF) confirming regulatory standard compliance.
• Information Notice EU Data Act (PDF) for official regulatory reference.

FAQ

Which lamp loads can be used with the theben DM 4-2 T KNX?

The actuator works with incandescent, low-voltage and high-voltage halogen, dimmable LED, and dimmable energy-saving lamps. Explore more theben automation devices for professional building automation projects.

What is the stand-by power requirement for this unit?

The device features a stand-by consumption of less than 1 W. For certificates and current technical files, refer to the official product documentation.

How is the theben DM 4-2 T KNX installed?

It is installed on a DIN rail, with electrical connections handled via terminal screws and standard KNX bus terminals.

What is the exact product model?

The order/model code for this page is 4940280. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by theben.

Where can I find the official technical documentation?

Use the manufacturer product page and datasheets for this exact SKU. Always verify the latest revision before specifying the product.

Conclusion

The theben DM 4-2 T KNX (4940280) universal dimmer actuator delivers robust 4-channel lighting control tailored for KNX automation environments, combining low stand-by consumption with broad light source compatibility. Installers and system integrators can review our become a KNX dealer options.