SCB-Monitoring Device SCBM16A is specially applied to intelligent PV combiner box. It can monitor the operating status of the PV cells, measure the current and voltage of PV cells, collect the SPD(Surge Protective Device) status and the DC breaker status and control relay output for driving external executive body. The device can display the data of measuring and the status of the other device via 6 digital displays. It also can connect the industrial equipment and computer to compose the monitoring system via the RS485 interface.