A/C Service Disconnect. This image was from a test inspection of a home in Florida that had a newer compressor installed. The installation came up a little short on the disconnect. I would recommend that a licensed electrical contractor install a proper service disconnect.
Do you have a better picture ? That one has way too much shadow to see anything .
That looks like a switch, which would be OK. Like Jim said, do you have a beter pic.
Tell us why you think that.
It appears to me that only one leg of the feed is connected to the disconnect. That would be a little short IMO. Really bad photo though.