Photovoltaic DC circuit breakers do not have defects that affect safe operation. The breaking capacity of the circuit breaker should meet the short-circuit current requirements of the busbar. If the breaking capacity of the circuit breaker is equal to or less than the short-circuit current of the busbar, there should be a metal partition or wall isolation between the circuit breaker and the operating mechanism. Remote operation should be performed when conditions permit, and the recloser should be disabled.

The position indication of the PV DC switch should correspond to the indication signal and instrument indication. Before closing the PV DC switch, check whether the relay protection is put into operation according to regulations. The arrangement of the load should be considered before opening.

Generally, manual closing of circuit breakers is not allowed.

When the hydraulic system sends out an abnormal pressure signal, it is forbidden to operate the spring energy storage mechanism. When the energy storage signal is issued, the closing operation is prohibited.

When the number of trips of the DC circuit breaker is close to the maintenance period, the reclosing device needs to be released.

During operation, the control switch should not return to the position too quickly, and should wait for the red and green light signals to be sent out before releasing it, so as to avoid the opening and closing coils being energized for a short time and refusing to move. The return of the electromagnetic mechanism should not be too slow, so as to avoid the malfunction of the auxiliary switch and burn the closing coil.

After closing the photovoltaic DC circuit breaker, it should be confirmed that all three phases are connected, and the automatic device has been set as required.