[Hads930]

So I am working on some home upgrades and thought I had my electrical accounted for but after I pulled the cover off of my sub-panel I learned that the cover showed I had 5 spares but there is only room for 3 breakers. I had planned on adding a 220V circuit out of the panel but now have to go back to the main panel where I have a spot for a double that I had planned for future use. I will be out of space once this breaker is installed but have a need (want) for (2) 220V circuits for devices that will see very little use and never at the same time. So now to the question.

Is there a device/switch that I can utilize that will allow me to power 2 different devices on the same circuit without the possibility of mistakingly powering them both at once? I have searched and looked for obvious solutions but I am not sure I would know it if I were looking at it.

I have an electrician from work looking over my work and advising wire size and all of the particulars before he comes and makes the final install, I just haven’t bothered him with this yet, figured I would have the solution in place first. Thanks in advance for any advice you may add.