Yacht Devices Smart Relay YDSR-01Smart Relay YDSR 01 The device helps you when you have two loads and only one power switch. For example, you have a combined deck steaming light on the mast and only two wires (positive and negative) inside the mast. Smart Relay powers the first channel when you turn the power switch on, and it powers the second channel when you cycle the power switch twice in one second. Smart Relay contains a bi stable RT424F05 relay and uses power only when