Manual transfer switch kit. Mechanically interlocked generator and utility breakers prevent dangerous backfeeding to avoid injuring utility line workers. Interchangeable type circuit breakers make it easy to reconfigure, replace or expand the circuits in your switch. Powers hard-wired circuits: Directly powers hard-wired appliances such as your furnace, well pump and septic pump. Fast, flexible installation. Suitable for surface or flush mounting. Kit package includes transfer switch: 50 A, NEMA 1 for indoor installation only.