1. PROTECTION FUNCTION: The manual dual power transfer switch is designed to switch between two power sources and provides overload and short circuit protection. 2. SIDE INTERLOCK: The handle of the right breaker is interlocked with the internal release mechanism of the left breaker. Therefore, opening the right breaker will cause the left breaker to trip. When the right breaker is open, opening the left breaker will fail, and the right breaker must be manually closed before the left breaker can be opened. 3. SAFE OPERATION: When both handles are opened simultaneously, only the right circuit is energized and the release mechanism of the left breaker is already disconnected, ensuring there is no risk of both circuits being energized simultaneously. 4. FINE WORKMANSHIP: The switch features silver alloy contacts and a PC flame retardant material housing. It also has a three-color indicator window, red (tripped), yellow (overload protection), and green (normal operation). 5. WIDE APPLICATION: The switch is suitable for use in RVs, homes, generators, or other dual power systems. It can be easily installed with screw clamp connections and 35mm DIN rails.