Marinco RY504-2-30 Reverse Y Shore Power Adapter

The Marinco RY504-2-30 Reverse Y Adapter feeds a 50A 125/250V four-wire boat inlet from two separate 30A 125V dockside receptacles.

This solves a specific and common problem: a boat wired for 50 amp service arriving at a dock that only has 30 amp pedestals. Two locking male plugs take the two 30A receptacles, and a single female connector feeds the boat inlet or cordset.

The two 30A supplies must come from opposite legs of the dock's service to produce the 250V across them that the boat expects. Plugging both into the same leg gives 125V where 250V is needed, and equipment on the 250V circuits will not run. That is worth confirming with the marina rather than assuming.

It is an adapter rather than a converter, so it changes the connection arrangement without altering the supply behind it. Total available current is also limited to what the two 30A circuits provide, which is less than a true 50A service delivers. Explore more shore power adapters.

• Feeds a 50A boat inlet from two 30A dock receptacles
• The two supplies must come from opposite legs
• Same leg gives 125V where 250V is needed
• Available current is less than a true 50A service