JUNG KNX Power Supply 1280mA 21280 REG DIN Rail

The JUNG 21280 REG is a high-performance KNX power supply unit designed for reliable bus voltage supply in building automation systems. With an output current of 1280 mA, it provides ample power for KNX devices on a single bus line. The integrated choke ensures stable communication, while the auxiliary 24 V DC output (300 mA) can power additional components. Housed in a compact 4 TE DIN rail enclosure (72 mm width), it features screw terminals for secure wiring, short-circuit and overload protection, and a bus reset function for easy maintenance. Suitable for residential and commercial KNX installations.

Advantages

Stable 30 V DC KNX bus voltage with 1280 mA output; integrated choke for interference-free bus communication; auxiliary 24 V DC output for external devices; comprehensive protection (short-circuit, overload); bus reset function for troubleshooting; compact 4 TE DIN rail design saves space.

Suitable for

• KNX building automation systems
• Smart home and commercial building control
• Powering KNX actuators, sensors, and controllers
• Supplying auxiliary 24 V devices

Key specifications

• Input: AC 230 V, 50/60 Hz
• KNX Bus Output: DC 30 V, 1280 mA
• Auxiliary Output: DC 24 V, 300 mA
• Integrated choke: Yes
• Number of bus lines: 1
• Mounting: DIN rail (REG), 4 TE (72 mm)
• Connection: Screw terminals
• Operating temperature: -5 °C to +45 °C
• Protection class: IP20
• Power loss: Max. 10 W

Recommendations

For optimal performance, use with JUNG KNX components and ensure proper ventilation. The auxiliary output can power a KNX line coupler or other 24 V devices. Always observe local electrical codes.