Solar photovoltaic DC isolating switch is an important equipment for solar photovoltaic system. It is mainly used to isolate the DC power supply of the solar photovoltaic power generation system and ensure the safe operation of the system. Its functions include disconnecting and connecting the circuit between the solar power generation system and other electrical equipment, preventing current short circuit, and providing overload and voltage protection of the system. In addition, the solar photovoltaic DC isolation switch can also be used to realize the maintenance and repair of the system.