The KNX-40E-1280 (D) is a high efficiency power supply suitable for a variety of applications, from intelligent home control to security systems.

  • EIB/KNX power supply with integrated choke
  • Compact size
  • Safety extra low voltage (SELV)
  • Suitable for TPI-256
  • 180~264VAC input
  • Short circuit protection, overload protection and over voltage protection
  • Cooling by free air convection
  • Isolation class I
  • LED indicator for normal operation, bus reset and bus overload
  • Monitoring of output voltage, output current, bus traffic load and device temperature
  • Wide variety of diagnostics and logic function
  • Over voltage category III
  • 3 years warranty
As a leading power supply manufacturer, MEAN WELL are continuously championing for a greener, and more sustainable, society by promoting smart building technology.

The KNX-40E-1280 (D) is a 1280mA power supply, with high efficiency and a small footprint of 4SU.

The KNX-40E-1280 (D) power supply has a KNX bus choke output, and additional output for auxiliary power.

With a wide operating temperature range of -30~+70°c, the device is suitable for a multitude of applications.

Device temperature and other measurement values can be sent via KNX for troubleshooting issues, monitoring purposes, output voltage, output current and bus traffic.

Additionally, LED indicators are used in case of normal operation, overload conditions and reset operation.

The KNX-40E-1280 (D) is designed to work with all KNX trademarked products.


For more information and to discuss your requirements, please contact us.

Additional information

Inputs 180~264Vac


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  • Intelligent home control
  • Modern building automation
  • Lighting control
  • HVAC system
  • Security system
  • Blinds and shutters
  • Monitoring systems
  • Energy management
  • Alarm monitoring