Description
Introduction
The theben Line coupler Sec KNX (Item no. 9080048) is a high-performance system component designed to structure and expand KNX building automation topologies. Functioning as an area coupler, line coupler, or segment coupler, it enables logical isolation and data routing between distinct bus lines, optimizing overall network performance. This device is part of our KNX automation components range.

Engineered for standard DIN rail mounting, this device operates on a 24 V DC supply with a minimal KNX bus current consumption of ≤10 mA. When utilized as a segment coupler to extend a main line with additional subline segments, it offers full operational support specifically when configured using ETS 6 software.
Key Features
- Multi-mode topology support: Area Coupler, Line Coupler, and Segment Coupler.
- Segment coupler functionality accessible using ETS 6 configuration software.
- Standardized connection utilizing standard KNX bus terminals.
- DIN rail panel mounting for clean, organized distribution setup.
- Rated operating voltage of 24 V DC alongside KNX bus power.
Benefits
- Versatile topology integration allowing operation as an area coupler, line coupler, or segment coupler.
- Enables seamless bus expansion across main lines, area lines, sublines, and extended line segments.
- Efficient power characteristics with a standard KNX bus current draw of ≤10 mA.
- Compact 2-module DIN rail form factor for easy distribution panel setup.
- High system reliability backed by Class III protection and an IP 20 enclosure rating.
Technical Specifications
Applications
- Area Coupler: Interfacing a KNX backbone (main line) to an area subline.
- Line Coupler: Connecting an area main line to an individual line or subline.
- Segment Coupler: Extending an existing main line with additional line segments via ETS 6.
Installation Notes
- Mount securely onto standard DIN rails within control cabinets or distribution panels.
- Connect to the KNX line using standard KNX bus terminals.
- Ensure correct wiring according to Class III protection and IP 20 environmental guidelines.
Developer Resources
- KNX Database files (Single Product and All Products in ZIP format)
- Technical Data sheet and Operating Manual (PDF)
- CE Declaration of Conformity and EU Data Act Information Notice (PDF)
FAQ
What functional modes does the theben Line coupler Sec KNX support?
It functions as an area coupler (connecting backbone to area line), a line coupler (connecting area line to subline), or a segment coupler (extending a line with extra subline segments). Explore more theben KNX products for professional building automation projects.
Which software version is required to use this device as a segment coupler?
Segment coupler mode is available exclusively when configuring the device with ETS 6. For certificates and current technical files, refer to the official product documentation.
What is the operating voltage and bus current consumption?
The device features an operating voltage of 24 V DC and draws ≤10 mA from the KNX bus voltage.
What is the exact product model?
The order/model code for this page is 9080048. 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 Line coupler Sec KNX (9080048) provides essential line handling and segment expansion capabilities for structured KNX networks. Its support for ETS 6 segment coupling and standard DIN rail installation makes it a reliable choice for professional system engineering. Installers and system integrators can review our KNX dealer program options.







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