The rated working voltage of AL7-63 small DC circuit breaker can be as high as DC 1200V. The circuit breaker adopts a special arc extinguishing and current limiting system, which can quickly disconnect the fault current of the DC power distribution system and protect the important components in the solar power generation system— Photovoltaic modules are protected from high DC reverse current and AC feedback current caused by inverter failure, ensuring reliable operation of solar photovoltaic power generation systems.