RDH5(HGL) series load isolating switch (hereinafter referred to as the switch) is suitable for AC 50Hz, rated voltage up to 660V, DC rated voltage up to 440V, rated current of 125A-1600A, in the distribution system for non-frequent connection and disconnection of circuits and isolation circuits, of which 1000A above switches only do electrical isolation. The switch has a glass fiber reinforced unsaturated polyester resin housing: the spring energy storage acceleration mechanism can quickly realize the connection and disconnection, the contact structure is a parallel double break two separated contact surfaces, and the sheet spring guarantees the contact pressure; The switch can automatically determine the limit position of the on-off and has a clear on-off mark to indicate the on-off position.