# Power Adapter MEAN WELL KNX-20E-640

**URL:** https://aio.lv/en/product--mean-well-knx-20e-640--1622632
**Data updated:** 2025-12-29 07:43 (EET)
**Category:** Power Supplies (PSU)
**Manufacturer:** mean well
**Manufacturer code:** KNX-20E-640
**EAN:** 4021087034500
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 124.95 €
**Prices and availability valid until:** 2026-08-01 23:59
**Price without VAT (21%):** 103.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--mean-well-knx-20e-640--1622632

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Wednesday | free |
| Pickup points | 13.07.2026 | 1.89 EUR |
| Courier delivery to door | 13.07.2026 | 4.99 EUR |

## Summary description

The MEAN WELL KNX-20E-640 is a reliable 20W power adapter with an input voltage range of 180-264V and an output voltage of 30V. It is RoHS compliant, ensuring environmental safety. Compact dimensions of 52.5mm width, 54.5mm depth, and 90mm height make it suitable for various applications. Each pack contains 60 units, providing a cost-effective solution for your power needs.

## Long description

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.
Usage 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.

## Specifications

| Feature | Value |
|---|---|
| Input voltage | 180 - 264 |
| Output voltage | 30 |
| Output current | 0.64 A |
| Output power | 20 W |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | RoHS |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.215 kg |
| Height | 90 mm |
| Width | 52.5 mm |
| Depth | 54.5 mm |

### Logistics data

| Feature | Value |
|---|---|
| Quantity per pack | 60 pc(s) |

## FAQ

### How much does the Power Adapter MEAN WELL KNX-20E-640 cost, and is it available for purchase?

The price is 124.95 € (valid at the time of publication and already includes all taxes). The item is available for order — 151 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on Wednesday at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Power Adapter MEAN WELL KNX-20E-640 be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All mean well products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized mean well service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for Power Adapter MEAN WELL KNX-20E-640?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/1622632/64167635_large.webp