Square D for sure and I'm sure a few others manufacture just what you're looking for. A small 2 or 4 circuit sub panel is fed from the main and the outside generator plug, it's an either or proposition (the panel is fed by utility or geneator)and has to be done manually, but it's legal and safe. How can any of us trust anyone during a power outage to be methodical, etc. This does the job, the geneartor can be wheeled back there and you can sleep at night.
