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This common power DC protection board uses an optocoupler. Since the optocoupler has input and output isolation. Since the input end of the optocoupler belongs to the low-resistance type of current type operation, it has strong common mode suppression capability.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.