4-Channel Relay Control Board Module With Optocoupler, 4 Way Relay Module For Arduino 4-Channel Relay Output Modules, Relay Output Contacts 250A 10A. Input In1, In2, In3, In4, The Signal Line Low Effective. Vcc, Gnd Power Input, Can Relay A Separate Power Supply Relay Power Input Of Jd-Vcc. Uses: Support All Mcu Control. The Industrial Sector Plc Control Smart Home Control. Wiring: Vcc: Positive Power Supply System Gnd: System Power Supply Negative In1 - In4: Relay Control Ports
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