Breaker in circuit panel doesn't appear to do anything?
Could there be simply an unused breaker in the panel? If it's unused, why wouldn't the electrician just leave the blank piece of metal there instead?


Yes sometimes spare breakers are inserted as part of the contract to allow for future expansion. Or someone discontinued a circuit and left the breaker.

Either way it is nothing to be too concerned about. At least now you know you have an open circuit if you wish to add something later.

Happy Day!