ac adapter

If your console is the original big Xbox One, you can't just plug it into the mains as European mains are 230V and your American console is only 110V. The best course is to buy an official Xbox Power supply unit which you should be able to buy by calling
Xbox support. Do not be tempted into purchasing any third party power supplies. These have not been tested for safety - you could be electrocuted, or cause a fire. And should it fail, your console would be warranty voided.

The other option is a step-up transformer, but these too are not recommended. They tend to run hot, and, just as with a fake power supply, if the transformer damages your console, it will be warranty voided.

If you use an adapter that has a higher voltage than the one that came with the console then you risk blowing out the console and will have to purchase another one.

If you have a GameStop (or other video game shops) in Belgium, you might find used, official power supplies for sale. Otherwise, you should be able to get a replacement power supply if you talk to Xbox Support (chat or phone call). Replacement cost may vary
depending on your Xbox's warranty status.

Xbox Support: http://support.xbox.com/en-US/contact-us?NavigationPath=/en-US/xbox-one/accessories/about-power-supply

NOTE: Since you said you are in Belgium, you may need to change the regional settings on the linked webpage. That option is found at the very bottom left corner of the page.

Hey there!

Have you tried following the steps on our
Xbox One Power Supply Troubleshooting page? Following each of the steps on that page will be the best route to take. If you continue to experience issue, your power supply may need to be repaired/replaced. To start that process, please visit our
Online Service Center.

Hope this helps!

Try MediaMarkt, even if they dont have one they maybe able to order you one.

Hope this helps.