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Amazon.com: HiLetgo 4 Channel 24V Relay Module with OPTO-Isolated Support High and Low Level Trigger for PLC Automation Equipment Control : Industrial & Scientific
Amazon.com: Saturey Relay 10PCS 50 PCS DC Power Relay SRD-05VDC-SL-C SRD-12VDC-SL-C SRD-24VDC-SL-C Relais Rele Relay 10A 5V 12V 24V DC (Current Range : SRD-12VDC-SL-C, Size : 10PCS) : Automotive