theben DM 2 T KNX 2-Way Universal Dimmer Actuator (4940270)

Description

Introduction

The theben DM 2 T KNX (Item no. 4940270) is a professional 2-way universal dimmer actuator designed for integration into KNX building automation systems. Built for standard DIN rail installation within the FIX1 series, this 4-module wide device provides independent, reliable dimming control across two output channels in residential and commercial environments. This device is part of our KNX Actuators products range.

Engineered to control a comprehensive range of light sources, the DM 2 T KNX handles dimmable LED, incandescent, low-voltage, and high-voltage halogen lamps, as well as dimmable energy-saving lamps. It operates on a 230 V AC (50 Hz) supply while maintaining low bus power consumption (≤4 mA) and offering a minimum switching capacity of 5 W.

Key Features

• 2-way universal dimmer actuator in FIX1 housing
• DIN rail mounting across 4 module widths
• Operating voltage of 230 V AC at 50 Hz frequency
• Incandescent and halogen load capacity up to 400 W
• Minimum switching capacity starting at 5 W
• Maximum cable length support up to 100 m
• IP 20 protection rating and ambient operating range of -5°C to 45°C

Benefits

• Broad Lamp Compatibility: Supports dimmable LEDs, incandescent, high-voltage/low-voltage halogen, and dimmable energy-saving lamps.
• Efficient Dual-Channel Output: Controls two separate dimming zones within a compact 4-module width footprint.
• Low KNX Bus Load: Operates with a minimal bus current consumption of ≤4 mA.
• Trailing Edge Support: Designed for high performance with energy-saving lamps using trailing edge (RC-mode) dimming up to 400 W.
• High Electrical Safety: Designed in compliance with Protection Class II according to EN 60 669.

Technical Specifications

Specification	Value
Operating voltage KNX	Bus voltage, ≤4 mA
Operating voltage	230 V AC, 50 Hz
Frequency	50
Lamp types	Incandescent, low-voltage and high-voltage halogen and dimmable energy saving lamps and LED
Incandescent/halogen lamp load	400
Energy saving lamps	Trailing edge (RC-mode): 400 W
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
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	2
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Switching capacity min.	5
Ambient temperature	-5°C … 45°C
Operating instructions	PDF
Type of protection	IP 20

Applications

Commercial Lighting Automation: Suitable for offices, conference halls, and hospitality environments requiring central KNX dimming control for energy-efficient LED and halogen lighting. Explore more theben KNX products for professional building automation projects.

Residential Smart Homes: Delivers flexible multi-zone lighting management for modern residential projects, enabling smooth brightness adjustment across various lamp types.

Installation Notes

• Mounting & Terminal Connection: Mount the unit on standard DIN rails in dry environments (IP 20). Secure main line wiring (230 V AC, 50 Hz) using the integrated screw terminals, supporting solid wire from 0.5 mm² to 6 mm² or stranded wire with sleeves from 0.5 mm² to 4 mm².
• KNX Bus Integration & Environmental Conditions: Connect to the KNX line using standard KNX bus terminals. Ensure cable lengths do not exceed 100 meters and operating ambient temperatures stay within -5°C to 45°C.

Developer Resources

• Data sheet (PDF)
• Operating instructions (PDF)
• CE declaration of conformity (PDF)
• Information Notice EU Data Act (PDF)

FAQ

What light sources can be dimmed with the theben DM 2 T KNX?

It supports dimmable LED lamps, incandescent lamps, low-voltage and high-voltage halogen lamps, and dimmable energy-saving lamps. For certificates and current technical files, refer to the official product documentation.

How many independent output channels does SKU 4940270 provide?

The DM 2 T KNX is equipped with 2 independent dimming channels.

What is the maximum load rating for incandescent and halogen lamps?

The device handles incandescent and halogen loads up to 400 W.

What installation form factor does this actuator use?

It is designed for standard DIN rail mounting, taking up 4 module widths.

What is the exact product model?

The order/model code for this page is 4940270. Match it against project documents before purchase.

Who is the manufacturer?

This product is manufactured by theben.

Conclusion

The theben DM 2 T KNX (4940270) 2-way universal dimmer actuator combines high load versatility, compact DIN rail mounting, and precise control for KNX lighting setups. It is an outstanding choice for system integrators aiming for high-standard dimming performance in modern smart buildings. Installers and system integrators can review our KNX dealer program options.