The Reliance Controls 31410B Pro/Tran 10-Circuit Indoor Transfer Switchis as easy to install as it is to operate. The purpose of a transfer switch is to connect a secondary power source, like a generator, to circuits in one's home or building that are wired into the electrical system. Thus, it is designed to enable the wiring system of the building to accept the full power of a portable generator, which can run multiple electrical appliances and devices during a power outage. The transfer switch ensures that you can safely use back up power during a power outage without having to worry about back feeding the utility line. In an emergency situation, this transfer switch can make all the difference. Since 1909, Reliance Controls Corporation has contributed more innovations than any other single manufacturer and has been awarded over 85 patents on manual transfer switches, time switches and accessories. Reliance Controls Corporation specializes in the manufacturing of a wide variety of electrical products. The primary product line consists of heavy duty time clocks and controls, generator accessories, transfer switches and transfer panels for portable generators. And after over a century of innovation, Reliance Controls Corporation has built an enviable reputation for high quality, superior engineering and exceptional customer service.