Berker 80040001 KNX bus coupler flush-mounted interface module

In a modern KNX smart home or building, conventional push-buttons and sensors need a reliable bridge to the bus. The Berker 80040001 Bus Coupler fits discreetly behind a standard flush-mounted control element, reading its switching state and converting it into KNX telegrams. This enables centralized control, scene management, and integration of existing Berker devices into the KNX network without additional wiring.

Key specifications

• System: KNX (TP)
• Mounting: Flush-mounted in standard flush box
• Function: Bus coupler / interface module for Berker push-buttons, switches, and compatible devices
• Power supply: Via KNX bus (21-30 V DC)
• Current consumption: Max. 10 mA
• Bus connection: KNX bus terminal (red/black)
• Device connection: 2-pin connector for Berker device
• Programming: ETS software
• Protection class: IP20
• Operating temperature: -5 to +45 °C
• Storage temperature: -25 to +55 °C
• Relative humidity: 5% to 93% (non-condensing)
• Housing material: Plastic
• Compatibility: Berker S.1, B.3, B.7, K.1, K.5, Q.1, Q.3, R.1, R.3, Arsys, B.IQ, TS series
• Certification: KNX certified

Why choose it

This bus coupler eliminates the need for separate wiring between each control point and the KNX line. By leveraging the existing 2-wire bus, it reduces installation time and material costs. Its compact design fits into standard flush boxes, making it ideal for retrofits where space is limited. The module is fully configurable via ETS, allowing precise assignment of functions and integration into complex building automation scenarios.

Ideal use cases

• Retrofitting existing buildings with KNX while reusing conventional push-buttons and switches.
• Integrating Berker S.1, B.3, B.7, K.1, K.5, Q.1, Q.3, R.1, R.3, Arsys, B.IQ, and TS series devices into a KNX network.
• Enabling scene control and centralized management for lighting, blinds, and other loads.
• Space-constrained installations where a compact flush-mounted interface is required.

Good to know

The Berker 80040001 is KNX certified, ensuring interoperability with other KNX devices from various manufacturers. It is powered directly from the bus, so no additional power supply is needed. Configuration is done entirely in ETS, the standard KNX engineering tool. The module is designed for indoor use with an IP20 protection rating and operates reliably within a wide temperature range.