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For 18V AC Output: use two blue wires. Current: 500mA 0.5A max. Insulate and DO NOT connect the other Red wire, since it will be Hot when you power the other Red wire. For 220V AC input: use two Red wires.
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.