Power Supply Jung 20640REG KNX 640 mA

The jung 20640REG KNX 640 mA DIN-rail power supply unit provides stabilized bus power for KNX building-automation installations. Designed for mounting in electrical distribution cabinets, this compact unit supplies a continuous 640 mA output tailored to the needs of KNX sensors, actuators and control interfaces. The device delivers the necessary voltage and current for reliable KNX bus communication and device operation in both residential and commercial systems.

Advantages

The unit supplies a dedicated, stabilized output that helps prevent voltage drops on the KNX bus and supports consistent device behavior. Its DIN-rail form factor simplifies installation in standard electrical cabinets and switchgear. Built for KNX applications, the power supply integrates with common bus topologies and reduces the need for separate external supplies. The regulated output and professional mounting reduce maintenance needs and improve overall system stability.

Suitable for

Key specifications

How to use

Install the unit on a DIN-rail inside the electrical cabinet, following local electrical codes and the KNX installation guidelines. Connect the unit’s DC output to the KNX bus line and the AC input to the building supply via appropriate circuit protection. Ensure wiring polarity and terminal tightening according to the manufacturer's instructions. After powering up, verify that KNX devices receive bus voltage and that bus communication is stable. For parallel or segmented lines, follow KNX topology best practices to avoid exceeding the 640 mA supply capacity.

Recommendations

Place the unit in a ventilated cabinet space and avoid mounting near heat sources. Use appropriate overcurrent protection on the AC input and monitor total bus device current to remain within the 640 mA rating. For larger KNX installations, consider using additional power supplies or line couplers to distribute load and preserve bus integrity.