SolaHD SDUCFRELAYCARDProduct Attribute Attribute Value Accessory Type I O Relay Card For Use With SDU AC A Series Series SDU AC A Series Type Network Communication Module Overview SolaHD SDU Off Line DIN Rail UPS Series: The SDU Off Line DIN Rail UPS series combines an industry leading compact design with a wide operation temperature range and unique installation options. This cost effective protection solution provides ride through during brief power outages. This allows