Marinco 50A Stainless Shore Power Inlet (AISI 316, 125/250V)

This Marinco 50A (125/250V) stainless steel shore power inlet is a top-tier solution for safely and reliably bringing dockside electricity into your yacht or boat. With a housing and lid made from polished AISI 316 stainless steel, this inlet combines exceptional strength with an elegant appearance. The marine-grade stainless material ensures long-term corrosion resistance – even under daily saltwater, UV, and temperature extremes, the inlet will maintain its functionality and shine.

The inlet is designed as a three-pole input (four terminals: two hot legs, one neutral, and one ground), which allows your vessel to connect to a standard 50A 125/250V shore power system. This means your boat can receive both 125V (single-phase) and 250V (dual/split-phase) power, depending on the marina’s supply. Inside, the four male contacts are heavy-duty and nickel-plated, providing excellent conductivity and resistance to oxidation. When the matching shore power plug is inserted, a secure, tight connection is achieved – the plug’s locking ring threads onto the stainless inlet’s body, eliminating any play or gaps that could let in water.

The inlet’s lid is spring-loaded and automatically closes as soon as the plug is removed. This way, the power entry stays protected from the elements whenever you’re not plugged in. Thanks to a precision-fitted rubber gasket, the inlet attains an IP56 rating with the lid shut – capable of withstanding heavy rain, sea spray, and storm conditions without allowing water to reach the electrical components. Installation is straightforward: a circular cutout of the standard diameter for 50A inlets is required, and the flange mounts with four screws (using stainless screws is recommended to match the material). On the interior, robust screw terminals are provided for connecting your boat’s wiring – each terminal is clearly labeled, helping to avoid mistakes when attaching hot, neutral, and ground conductors.

Applications & Recommendations:

• Luxury Yachts & Commercial Vessels: The stainless 50A inlet is preferred for high-end yachts, sport-fishing boats, and other commercial vessels where reliability and appearance are both critical. It delivers trouble-free power onboard (for running multiple AC units, galley appliances, charging stations, and other heavy loads) while also contributing to the vessel’s premium look and value.
• Vessel Size: Typically, a 50A inlet is installed on vessels over ~40 feet in length or those with multiple significant electrical systems onboard. Ensure your vessel’s electrical system is compatible and properly protected (with the correct fuses/breakers) for handling a 50A service.
• Replacement & Compatibility: This inlet shares standard sizing with other Marinco 50A inlets. If you are upgrading from a plastic to a stainless version, the cutout dimensions and electrical configuration are the same, making the swap straightforward.
• Maintenance: Caring for the stainless flange will keep it looking pristine – periodically rinse it with fresh water to remove salt and polish with a stainless steel cleaner to maintain its shine. Check the condition of the lid’s gasket; if it loses elasticity over time, replace it to ensure continued waterproof performance.
• Safety: Always close the lid when the cable is not plugged in to prevent water and debris from entering. When connecting to shore, use the proper Marinco plug (50A 125/250V) and, after tightening the locking ring, double-check that the connection is secure. This will ensure optimal performance with minimal loss or heating at the junction even under full load.