Hello,
Thank you for reaching out and raising your question about the Samsung - 30" Single Wall Oven with Steam Cook and Wi-Fi - Stainless steel. I understand you want to know the breaker size and the power wire you need to have for the product. We are here to help.
To answer your question, the KW rating is 4.9, the breaker size is 30 Amps, and the correct voltage is 240 volts.
You may refer to this link https://image-us.samsung.com/SamsungUS/home/home-appliances/cooktops-and-hoods/gas/pd/03202018/NV51K6650SS.pdf to know more about the product specifications.
Should you need more assistance, please feel free to get back to us via the following options:
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Your reference number is 1144318140.
-Noraina