KNX Power Supply Units

The Power Supply Systems KNX PS640 and KNX PS640 USB deliver a 29 V bus voltage for the KNX system and 24 V DC supply voltage for 24 V devices. The KNX PS640 USB has got an additional USB interface for an easy bus access.

Special operating conditions such as short circuit, overvoltage, overload or excess temperature are recorded and may be read off on the display. The present power discharge is displayed as well. It is possible to reset the connected bus devices directly by means of the key pad.


N° 70140 KNX PS640
N° 70143 KNX PS640 USB, with USB interface

KNX PS640 (70140)
  • Delivers a 29 V KNX bus voltage (reduced), output current max. 640 mA, short-circuit proof
  • Delivers 24 V DC (not reduced), output current max. 150 mA
  • Reset of a line directly on the device
  • Record of operating hours, overload, external overvoltage, internal overvoltage, short circuit and excess temperature
  • Display of operating data bus voltage, bus current and temperature of the device
  • The display may be shown in German, English, Spanish or Dutch
  • Only KNX PS640 USB: USB interface for bus access via PC
HousingPlastic material
MountingSnap-on fitting on mounting rails
Degree of protectionIP 20
Dimensionsapprox. 123 x 89 x 61 (W x H x D, mm), 7 width units
Weightapprox. 370 g
Ambient temperatureOperation 0…+45 °C, storage -25…+70°C
Ambient air humidity5...95% RH, avoid bedewing
Operating voltage230 V AC, 50 Hz
Power consumption Standbyapprox. 2.3 W
Outputs• KNX bus voltage 29 V (reduced),
 Output current max. 640 mA, short-circuit proof
• 24 V DC (not reduced), Output current max. 150 mA