Power Supply MEAN WELL KNX-40E-1280

The MEAN WELL KNX-40E-1280 is an AC-DC DIN-rail power adapter designed for KNX/EIB building automation systems. It provides a stable 30 V DC output with integrated choke and basic functionality for powering KNX bus devices. The unit accepts a wide AC input range of 180–264 V and is RoHS compliant; its compact housing measures 72 mm (W) × 57 mm (D) × 90 mm (H). Each pack contains 48 units, suitable for larger installations or bulk procurement.

Advantages

The KNX-40E-1280 delivers a constant 30 V DC output at up to 1.28 A, includes an integrated choke for bus filtering, and mounts on standard DIN rails for easy installation. Its broad input voltage range ensures compatibility with varied mains supplies, and the compact form factor helps save panel space.

Suitable for (tasks / use cases)

• Powering KNX/EIB bus devices in residential or commercial automation
• Centralized installations in equipment cabinets and control panels
• Projects requiring multiple units purchased in bulk

Key specifications

• Output voltage: 30 V DC
• Output current: 1.28 A
• Input voltage: 180–264 V AC
• Mounting: DIN rail
• Dimensions: 72 mm × 57 mm × 90 mm (W × D × H)
• Compliance: RoHS
• Package quantity: 48 units per pack
• Brand: MEAN WELL; MPN: KNX-40E-1280; EAN: 4021087052429

How to use

Install the KNX-40E-1280 on a standard DIN rail inside the electrical cabinet. Connect the AC mains input (180–264 V) to the input terminals and the 30 V DC output to the KNX bus line or devices, observing correct polarity and local electrical codes. Ensure sufficient ventilation around the device and verify the total bus current does not exceed 1.28 A.

Recommendations

For reliable operation, place the power adapter in a dry, ventilated enclosure, avoid exceeding the rated output current, and follow KNX installation guidelines when connecting the bus. Use units from the same production batch for uniform performance in multi-unit installations.