Conrad Components 393905 Relay card Component 5 V DC | Conrad.com
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OR8 external optocoupler and relay boards
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NOYITO 8-Channel Relay Module High Low Level Trigger with Optocoupler Isolation Load DC 30V AC 250V 10A for PLC Automation Equipment Control Industrial Control (8 Channel 12V): Amazon.com: Industrial & Scientific
8 Channel Relay Module 5v/12v/24v High And Low Level Trigger Relay Control With Optocoupler For Plc Automation Equipment Control - Integrated Circuits - AliExpress