SmartPlug 50 Amp Boatside Inlet – Stainless Steel (BM50S)

The SmartPlug 50 Amp Boatside Inlet (BM50S) is a high-quality, marine-grade shore power inlet engineered for safe and reliable 50A electrical connections on boats, yachts, and RVs. Built from durable stainless steel, this inlet is designed to replace traditional twist-lock shore power inlets and provides exceptional conductivity and corrosion resistance in harsh marine environments.

Featuring SmartPlug’s push-in design, the inlet allows easy insertion of the matching SmartPlug connector without twisting, ensuring proper alignment every time—even in low-light conditions. A multi-point locking system secures the plug in place to minimize movement and stress on electrical contacts, reducing heat buildup under heavy loads. Weatherproof seals help keep moisture out, protecting connections and improving long-term reliability. 

Engineered for 50 Amp, 125/250 V AC service with both 3-wire (125 V) and 4-wire (250 V) compatibility, the BM50S inlet installs easily using existing twist-type mounting patterns, making it an ideal upgrade for modern shore power systems.

50A 125V/250V Stainless Inlet

The 50 amp stainless inlet easily retrofits to the existing 4 hole pattern and footprint as the traditional twist-type inlet. The 50A inlet can be wired for 125V or 250V service and is used in conjunction with the 50A connector (BF50). The Inlet cap and flange are made with 316 stainless steel.

Key Features

• Extreme Electrical Contact: Increased contact surface area significantly reduces resistance and heat buildup.

• Straight-In Connection: The asymmetrical shape allows for a simple "push-in" connection—no twisting or alignment of pins required in the dark or rain.

• Triple-Locking System: Features two heavy-duty side clips and a locking cap that mechanically secure the plug, removing all tension from the electrical pins.

• Watertight Integrity: Equipped with three silicone gaskets to keep moisture and salt spray away from the terminals.

• Easy Retrofit: Designed to fit the standard industry hole pattern for 50A inlets, making it a drop-in replacement for existing systems.

• Premium 316 Stainless Steel: Marine-grade housing provides maximum resistance to pitting and corrosion.

In the Box

• (1) SmartPlug 50A Stainless Steel Inlet

• (1) Rear Protective Enclosure (Strain Relief)

• (1) Mounting Gasket

• Installation Instructions

Technical Specifications — SmartPlug 50 Amp Boatside Inlet (BM50S)

⚡ Electrical

• Amperage Rating: 50 Amps — supports high-current shore power systems commonly used on larger boats and RVs.

• Voltage Compatibility: 125 V / 250 V AC — suitable for 50A service applications in North America (both 3-wire and 4-wire systems). 

• Connector Type: Male inlet for boatside mounting. 

🔌 Design & Connection

• Contact Surface Area: Increased pin and clip surface area improves electrical conductivity and reduces overheating compared to traditional twist-type inlets. 

• Push-In Compatibility: Designed for use with SmartPlug systems that utilize a push-in connector style (no twist required), ensuring proper orientation and secure engagement every time. 

• Locking System: Multi-point locking clips secure the matching SmartPlug connector in place to minimize movement and stress on electrical contacts. 

• Sealing: Weather-resistant multi-fin silicone gaskets help protect electrical connections from moisture intrusion. 

🏗️ Construction

• Housing Material: Stainless steel — excellent corrosion resistance for marine and coastal environments. 

• Finish: Brushed or polished stainless for durability and aesthetics. 

• Mounting: Fits existing shore power inlet flange hole patterns, allowing for retrofit installation without major modifications. 

🛠️ Installation & Maintenance

• Installation: Quick and easy replacement of standard twist-type 50A inlets; typically installed in about 30 minutes with basic tools. 

• Retrofit Friendly: Mounting flange hole spacing matches common inlet footprints for seamless replacement. 

🌊 Typical Applications

• Marine: Boats, yachts, and larger vessels requiring stable and secure 50A shore power connections. 

• RV: Suitable for RV shore power inlet upgrades when using SmartPlug systems that improve safety and reduce overheating risk. 

📦 Model Information

• Manufacturer: SmartPlug

• Model / Part Number: BM50S — 50 Amp Boatside Inlet, Stainless Steel. 

• Integration: Compatible with all SmartPlug 50A connectors and cordsets.