06-03-2016 07:17 AM
Welcome to the Lenovo Community !
According to the specifications listed on page #9 of the B50-30's Hardware Maintenance Manual it is. The input voltage can range from 90V to 264V (AC). Here is a link to that manual for your reference....
06-03-2016 10:35 AM - edited 06-03-2016 10:36 AM
Yes, I am aware that you have the B50-30 AIO desktop.
No, there is no switch to flip. What you have is a dual voltage power source that will automatically conform to the supplied house current of either 110 or 220 volts.