Solar PV industry has become one of the most concerned emerging industries in the world today. The PV power generation is an effective way to absorb solar radiation energy by using solar energy and semiconductor
electronic devices, and make it into electric energy directly, is the mainstream way for solar power.The DC combiner box is used for connecting the photovoltaic array and
the inverter, providing lightning and over-current protection, and monitoring the single string current, voltage, temperature of the photovoltaic array, and the state of the lightning protection device. The photovoltaic DC combiner box
added the function of the circuit breaker trip when over- temperature or high pv string current, which can effectively prevent the damage caused by the external short circuit.