Siemens N 125/22 KNX Power Supply Unit DC 29 V 640 mA with Additional Unchoked Output

The Siemens N 125/22 KNX Power Supply Unit DC 29 V 640 mA is a powerful DIN-rail power supply for KNX building networks. It gives a steady DC 29 V output at 640 mA. This is enough to run a standard bus line with up to 64 devices.

Technical Specs

• Choked Output: The primary bus connection features an integrated choke. The choke decouples the DC power from the line, preventing the high-frequency data telegrams on the network from short-circuiting
• Additional Unchoked Output: This secondary output provides standard DC 29 V without a choke. It is widely used to power auxiliary components or to supply a separate, second KNX bus line via an external choke
• Buffer Interval: Bridges short mains power disruptions of up to 200ms at rated current to preserve network communication.
• Integrated Reset Button: Built-in slide/reset switch. Holding it down for more than 20 seconds completely disconnects the bus voltage to return connected bus devices to their initial state for troubleshooting or testing.
• Diagnostic LEDs: Clear visual indicators on the front panel display standard operating status, overloading, or voltage interruptions