Power Supply MEAN WELL KNX-20E-640

The MEAN WELL KNX-20E-640 is a compact AC-DC DIN-rail power adapter designed for KNX/EIB installations. It delivers a stabilized 30 V DC output at up to 640 mA (20 W) from a wide input range of 180–264 V AC and comes in a plastic enclosure with an integrated choke. The unit is RoHS compliant and suitable for mounting on standard DIN rails in control cabinets and automation panels.

Advantages

The adapter offers a stable 30 Vdc output with up to 640 mA current capacity in a small 52.5 × 54.5 × 90 mm plastic housing, simplifying installation in confined electrical cabinets. Integrated choke reduces noise and improves compatibility with KNX/EIB bus systems. Wide input voltage range (180–264 V AC) allows reliable operation in varying mains conditions. RoHS compliance ensures reduced environmental impact.

Suitable for

• Powering KNX/EIB bus devices and line couplers
• DIN-rail installations in residential or commercial automation panels
• Small control cabinets and electrical distribution modules

Key specifications

• Brand: mean well
• Model / MPN: KNX-20E-640
• EAN: 4021087034500
• Output: 30 V DC, 640 mA (20 W)
• Input voltage: 180–264 V AC
• Mounting: DIN rail
• Enclosure: plastic
• Dimensions (W × D × H): 52.5 × 54.5 × 90 mm
• Compliance: RoHS

How to use

Mount the KNX-20E-640 on a standard DIN rail inside the control cabinet. Connect the AC mains supply (180–264 V AC) to the input terminals following local electrical regulations and ensure proper protective devices are in place. Connect the 30 V DC output to the KNX/EIB bus or to the devices requiring 30 Vdc, observing correct polarity. Verify grounding and secure all terminal connections before powering the unit.

Recommendations

Install in a well-ventilated enclosure and avoid placing the adapter near heat sources. Ensure the total DC load does not exceed 640 mA and account for inrush currents of connected devices. Follow KNX installation rules and local electrical codes when integrating into bus systems.