theben DM 8-2 T KNX 8-way Universal Dimmer Actuator

Description

Introduction

The theben DM 8-2 T KNX (Item no.: 4940285) is an 8-way universal dimmer actuator from the FIX2 series engineered for sophisticated lighting control in KNX system architecture. Designed for mounting on DIN rail systems, this device manages dimmable lighting loads efficiently across 8 independent channels. This device is part of our professional KNX Actuators range.

Operating on standard KNX bus voltage with a low bus current draw of ≤17.5 mA, the unit interfaces seamlessly with main power supplies ranging from 230 V AC to 240 V AC at 50/60 Hz. It provides dependable control for a wide spectrum of light sources, ensuring seamless integration into modern commercial and residential automation setups.

Key Features

• 8 independent output channels integrated into an 8-module wide FIX2 DIN rail housing.
• Powered directly via 230 V AC – 240 V AC operating voltage (50 Hz – 60 Hz) alongside KNX bus voltage.
• Bus current consumption rated at ≤17.5 mA with standard KNX bus terminal connectivity.
• Terminal screw connections accepting solid wires from 0.5 mm² to 6 mm² and stranded wires with end sleeves from 0.5 mm² to 4 mm².
• Rated for an operating ambient temperature range of -5°C to 45°C.
• Supports minimum switching capacity of 2 and maximum cable lengths up to 100 meters.

Benefits

• Provides flexible 8-channel light dimming control from a single DIN rail mounted actuator.
• Compatible with diverse lighting technologies, including dimmable LED, low-voltage and high-voltage halogen, incandescent, and energy-saving lamps.
• High energy efficiency with a low standby power consumption profile of less than 1 W.
• Supports trailing edge (RC-mode) dimming up to 200 W for energy-saving lamp configurations.
• Designed to meet Protection Class II standards according to EN 60 669 for reliable operational integrity.

Technical Specifications

Specification	Value
Operating voltage KNX	Bus voltage, ≤17.5 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	8
Hand book	PDF
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Width	8
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

• Centralized lighting control and dimming across multi-zone commercial environments such as offices, conference rooms, and hospitality venues.
• Residential KNX automation projects requiring smooth dimming control for energy-efficient LED and traditional incandescent lighting.

Installation Notes

• Mount the unit directly on a standard DIN rail inside a distribution board, maintaining ambient operating conditions between -5°C and 45°C.
• Connect power supply using screw terminals suitable for solid wires up to 6 mm² or stranded wires with end sleeves up to 4 mm², and attach the KNX line using the official KNX bus terminal.
• Ensure total wiring length does not exceed 100 meters and adhere to EN 60 669 Protection class II safety guidelines.

Developer Resources

• Handbook (PDF)
• CE Declaration of Conformity (PDF)
• EU Data Act Information Notice (PDF)
• Technical Data Sheet (PDF)

FAQ

What types of lamps are supported by the theben DM 8-2 T KNX dimmer actuator?

It supports incandescent lamps, low-voltage and high-voltage halogen lamps, dimmable energy-saving lamps, and LED lamps. Explore more theben KNX products for professional building automation projects.

What is the standby energy consumption of this device?

The standby energy consumption is less than 1 W (<1 W). For certificates and current technical files, refer to the official theben documentation.

How many channels does the DM 8-2 T KNX feature and what is its mounting format?

It features 8 independent dimming channels and is designed for standard 8-module wide DIN rail installation.

What is the exact product model?

The order/model code for this page is 4940285. 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 8-2 T KNX (4940285) universal dimmer actuator delivers robust 8-channel control, high efficiency, and wide lamp compatibility for professional KNX building automation systems. Installers and system integrators can review our KNX dealer program options.