theben DMB 1 T KNX Dimming Output Extension Module – 4930279

Description

Introduction

The theben DMB 1 T KNX (Item no. 4930279) is a 1-channel dimming output extension module, also known as a Dimmbooster, engineered to extend the power capacity of compatible base and extension dimming actuators. Operating at an input voltage of 230 V AC (50 Hz), this module provides an additional 300 W/VA of dimming output per channel for high-demand lighting circuits. This device is part of our KNX Actuators range.

Designed for DIN rail mounting with a width of 1 module, the unit supports incandescent, low-voltage halogen, high-voltage halogen, and dimmable LED loads. Power capacity can be expanded up to a maximum of 2000 W/VA per channel by cascading up to four booster units, providing flexible lighting control for commercial and residential applications.

Key Features

• 1-channel dimming output extension module (Dimmbooster).
• Operating voltage of 230 V AC at 50 Hz frequency.
• Switching capacity of 300 W/VA per channel with a minimum capacity of 5 W/VA.
• Supports dimmable 230 V LED lamps in trailing edge / parallel operation up to 45 W/VA.
• Screw terminal connection system accepting solid wire (0.5–6 mm²) and stranded wire with sleeve (0.5–4 mm²).
• Protection rating IP 20 and Protection Class II according to EN 60 669.
• Designed for ambient operating temperatures ranging from -5°C to 45°C.

Benefits

• Scalable output capacity extends base dimming actuator channels by 300 W/VA each.
• Allows output expansion up to a total maximum of 2000 W/VA by combining up to 4 boosters.
• Broad lamp compatibility covering incandescent, halogen, and trailing-edge dimmable LED loads.
• Energy-efficient performance featuring a low standby consumption of approximately 0.2 W.
• Space-saving DIN rail design with a compact 1-module width.

Technical Specifications

Specification	Value
Operating voltage	230 V AC, 50 Hz
Frequency	50 Hz
Lamp types	Incandescent, low-voltage and high-voltage halogen and dimmable LED
LED lamp (trailing edge)	45 W/VA
Stand-by consumption	~0.2 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	1
Information Notice EU Data Act	PDF
CE declaration of conformity	PDF
Data sheet	PDF
Width	1 module
Installation type	DIN rail
Protection class	II according to EN 60 669
Type of connection	Screw terminals
Switching capacity per channel	300 W/VA
Switching capacity dimmable 230 V LED in parallel operation	45 W/VA
Switching capacity min.	5 W/VA
Ambient temperature	-5°C … 45°C
Operating instructions	PDF
Type of protection	IP 20

Applications

• Expanding the output capacity of KNX dimming channels in commercial lighting systems.
• Increasing load capabilities for large residential LED, halogen, or incandescent lighting groups.

Installation Notes

• Mount standardly on a DIN rail inside a distribution box providing IP 20 environment protection.
• Wire screw terminals using solid wires from 0.5 mm² to 6 mm² or stranded wires with end sleeves from 0.5 mm² to 4 mm².
• Ensure no more than 4 booster units are attached to a single channel to remain within the 2000 W/VA load limit.

Developer Resources

• Data Sheet (PDF)
• Operating Instructions (PDF)
• CE Declaration of Conformity (PDF)
• Information Notice EU Data Act (PDF)

FAQ

What is the primary function of the theben DMB 1 T KNX?

The theben DMB 1 T KNX is a 1-channel dimming output extension booster used to extend the output capacity of base and extension dimming actuators by 300 W/VA per channel. Explore more products from theben for professional building automation projects.

What is the maximum output limit achievable per channel using this booster?

By connecting up to a maximum of 4 DMB 1 T KNX boosters to a channel, the dimming output can be extended up to 2000 W/VA. For certificates and current technical files, refer to the manufacturer technical documentation.

What lamp types are supported by the DMB 1 T KNX?

It supports incandescent lamps, low-voltage halogen, high-voltage halogen, and dimmable LED lamps.

What is the exact product model?

The order/model code for this page is 4930279. 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 DMB 1 T KNX (Item no. 4930279) is a reliable solution for scaling dimming performance in KNX automation projects. With output expansion capability up to 2000 W/VA and a low standby footprint, it ensures efficient power booster management for demanding lighting installations. Installers and system integrators can review our dealer and project support options.