Smart 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 channels are switching; at all other times it consumes less than 0.5 mA. It can switch 7..28V DC loads with continuous current up to 10A and peak current of 20A (4 seconds, 10% duty rate). To switch between channels, you should cycle the power in one second. If you need to have one load constantly on and one should also be on after the fast cycling of the power, just connect the first load to the incoming power terminals and the second load to channel 2.

Smart Relay YDSR-01

Picture 1. Smart Relay YDSR-01 (see more images)

Despite the fact that the device is waterproof, the terminals are open and sea water can cause a short circuit. Do not place the device where it can be flooded by water, gets wet in the rain or sprayed with water. Always use an electrical fuse in your circuit.

Electrical Scheme

Picture 2. Electrical scheme

Resistance between the active channel terminal and VCC terminal is always zero. Smart switching is managed by a micro controller inside the device's case. High voltage (over 28V) on VCC terminal can cause permanent damage to the device.

Use cases:

Short video presentation (English version) of Yacht Devices Smart Relay YDSR-01 from Kiel Nautic at Dusseldorf Boat Show 2019 (German version is here).


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Device is equipped with four standard blade "FASTCON" terminals (6.3mm x 0.8mm). Five receptacles with insulation are supplied with the device, they are widely available in any electronics store.

Drawing of Smart Relay YDSR-01

Picture 3. Drawing of Smart Relay (all sizes are in millimeters)

For additional technical details, please see the User Guide and FAQ.


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