This 12-circuit, 120V/240V 50 Amp manual transfer switch is designed for fast indoor installation in a home, office or small business. It is pre-wired and enables the electrical system of the building to accept the power of a portable generator to run up to 12 single-pole circuits and any pair of single-pole circuits can be used as a double-pole circuit. It allows you to power electrical appliances, devices and lighting during a power outage. This transfer switch is completely codes compliant and keeps the generator power isolated from the utility power at all times. Circuit breakers are 1 in. interchangeable and can be changed to different sizes and brands that are compatible and within the maximum circuit size ratings. By incorporating the Powerhouse Power Transfer Kit in your off-grid homes or cabins, you can continually power your most needed devices with the help of our NATURE'S GENERATOR Powerhouse Systems. Customize a NATURE'S GENERATOR Powerhouse system that fits your specific off-grid needs. Remember. Run-times with the Powerhouse Power Transfer Kit are dependent on what you're powering and what NATURE'S GENERATOR Powerhouse system setup you currently have. IMPORTANT: Installation of the Powerhouse Power Transfer Kit must be performed by a qualified electrician in compliance with all applicable electrical codes. Do not charge NATURE'S GENERATOR Powerhouse by a wall through the AC input port when using the Powerhouse Power Transfer Kit.