PV DC circuit breakers are primarily used for on/off control and fault protection of DC circuits in PV systems. Common application scenarios include:
1. PV Module Side
Within the PV array's combiner box, they protect the DC circuits of individual PV modules or strings, preventing module failures (such as short circuits or overloads) from affecting the entire array.

2. Inverter FrontEnd
In the DC side of the circuit connecting the PV array and the inverter, they quickly disconnect the DC power supply when the inverter fails or requires maintenance, ensuring the safety of equipment and personnel.

3. Energy Storage System Interface
In a combined PV and energy storage system, they control the circuit between the PV DC side and the energy storage battery, preventing energy storage system failures from adversely affecting the PV array.

4. DC Merging Link
In the DC merge cabinet of a large PV power plant, they protect the circuit after multiple PV strings merge, ensuring stable and safe current flow during the merging process.
These scenarios all need to deal with the high voltage and high current characteristics of photovoltaic DC circuits, and avoid safety hazards such as arcing. Therefore, there are special requirements for the arc extinguishing ability and highvoltage resistance of the circuit breaker.