| Brand | Unbranded |
|---|---|
| Country of Origin | China |
Check the listing for details. 4 Channel Optocoupler Relay Module Board Stable Performance For Projects. Condition: New, Made in China. Listed at 15.04 USD. NO1--NO4: the relay normally opens the interface, and the relay is suspended before it is sucked in, and is connected with COM after it is sucked in. NC1--NC4: relay normally closed interface. The relay is short connected with COM before it is sucked in and suspended after it is sucked in.
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