5WG11251AB23 KNX Power Supply N125/23 640mA 30VDC DIN Rail

The 5WG1125-1AB23 (N 125/23) is a KNX system power supply unit delivering 640 mA at DC 30 V to power KNX bus devices in building automation installations. It generates the regulated KNX bus voltage from a 230 V AC / 50 Hz (or 220 V DC) mains supply, with an integrated choke on the bus terminal that filters mains interference and separates the bus from the power output — ensuring clean KNX bus signalling for reliable telegram transmission. The power supply includes an additional unchoked voltage output on a plug-in terminal for applications requiring unfiltered DC power (such as powering additional devices outside the KNX bus topology). Multiple N 125/23 units can be operated in parallel to increase available bus current for large KNX line segments with many bus devices. DIN rail mounting on TH35 rail (DIN EN 60715) with maintenance-free PUSH-IN terminals accepting 0.5–2.5 mm2 single-core, fine-stranded, and multi-stranded conductors. Standard delivery time: 1 day. Country of origin: Romania. Active Product.

The N 125/23 is the standard KNX line power supply for medium-to-large KNX building automation installations. Each KNX line segment requires at least one power supply unit; the 640 mA output of the N 125/23 supports up to approximately 64 standard KNX bus devices (at 10 mA consumption each) on a single line. In multi-line KNX systems (connected via KNX line couplers), one N 125/23 is installed per line, providing isolated bus power independent of other line segments. In commercial office fit-outs, the N 125/23 is mounted in the electrical distribution board alongside KNX actuators and gateways, powering presence detectors, room operator units, switching actuators, and dimming actuators across the floor. The parallel operation capability allows engineers to install two N 125/23 units on a heavily loaded line (with many high-current devices such as USB charging outputs or complex multi-sensor room units) to provide up to 1280 mA combined bus current without redesigning the network topology.