The TBQ3-63 series Small dual power Automatic Transfer Switch ( hereinafter referred to as "ATS") is suitable for dual circuit power supply systems with AC 50Hz/60Hz) , fixed working voltage 230V or 400V, rated working current 63A and below. Selective switching between two power sources can be performed as needed. The product has short-circuit and overload protection functions , as well as fire protection , double opening and output closing signal functions . Especially suitable for the installation of lighting circuits in office buildings , shopping malls , banks , stations , hospitals , and high-rise buildings that require fire protection requirements .