DollaTek
3-Channel Optocoupler Isolation Module AC 220V Isolated Board Testing No PCB Holder Detection

$6
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Product Details

FUNCTION: Test whether AC 220V is existed;when there is 220V,optocoupler can be conductive to ground;otherwise,it is not conductive. Can directly connect with SCM IO interface to test,voltage is 3-5V. Adaptive to connect with PLC,compatible to almost all PLC input.

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