Dominant source Generator (selectable delay) Open neutral protection No Reverse polarity protection No Safety interlocks Mechanical & Electrical Under-voltage protection No Overvoltage protection No Multi-mode surge protection No Total surge energy rating None Total surge current rating None Applied to RVs, speedboats, and various high-power equipment that requires emergency power supply. Once AC power from the Generator is sensed by this transfer switch, it will start a timer and automatically switch over to generator power supply after a 20-45 sec delay which ensures the generator has sufficient time to run up to speed before electrical load is applied. Double protection of built-in mechanical interlocks and control circuits prevents two separate 120/240 volt AC power sources from entering the AC distribution board at the same time and causing a short circuit. The coating process used on the surface of this transfer switch can be waterproof, rust-proof and anti-corrosion, and can effectively prolong the service life of the product.