D series solid state relay is DC input, DC output type, can realize DC level conversion, isolation and control, can be convenient to interface with computer and various digital circuits. It is widely used in industrial automation field for the control of various DC power execution organs, such as lighting equipment, small DC motors, DC power supplies, various electromagnetic devices and intelligent instruments, and can also be used as the driving stage of various high-power output devices. Easy to use, especially suitable for corrosive, humid and explosion-proof occasions.