SmartPlug 50A 125/250V Shore Power Connector & Inlet #:  21403
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SmartPlug 50A 125/250V Shore Power Connector & Inlet

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Popular as a retrofit for 50A 125V or 125/250V shore power cords and inlets. Provides greater protection against loose connections and corrosion, and the larger contact surfaces reduce heat - some of the leading causes of shore power failure and fires.
More Details...   #21403
Brand:  SmartPlug
MFG Part#:   B50ASSY
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SmartPlug 50A 125/250V Stainless Steel Inlet & Retro-Fit Connector Combo Kit B50ASSY

One of the primary causes of electrical arcing and overheating in twist-type shore power inlet designs is the fact that the electrical pins bear the weight of the cord, and can eventually work themselves loose. The SmartPlug's very strong sleeve design ensures that the body of the plug, not the electrical pins, bears any weight or tension - keeping those points of electrical contact firm and secure. 

The SmartPlug 50 Amp Retrofit Kit includes a 50A Stainless Inlet and the 50 Amp Connector, everything you need to protect your boat from shore power overheating and burning. Installation of both components is easy. The kit is designed to fit on 125/250 volt systems with multiple seals on the connector to ensure a watertight fit on an existing cordset. Two separate cord seals included allow for installation on a 125V or 250V cable.


  • Can be used for 125V or 250V service
  • Easily retrofits to replace your boat's existing shorepower inlet - even the mounting holes align
  • Reduces electrical shorts from loose connections
  • Intuitive to use - only one plug-in orientation - even in the dark
  • Easy-to-connect straight pins - with larger contact surface area than curved pins
  • Locking lid prevents accidental opening
  • Triple waterproof neoprene seals prevent corrosion
  • To replace a plug or connector on an existing cordset, just cut off the old end, strip the wires and fasten to the SmartPlug
  • Conforms to UL STD 498 and CSA STD C222 No. 42
  • Certified ETL, and meets ABYC E-11 standards
  • Incredible 7-year warranty

  SmartPlug 50 Amp Inlet Installation

  SmartPlug 50 Amp Connector Installation

  SmartPlug Marine Flyer

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Q. Do you offer Free Shipping?
A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

Q. What do you mean by most orders?
A. Some items are exempt from this offer and are indicated on the product page. Exempt items are usually bulky or heavy items such as buoys. Over 98% of the items on qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

Q. Where do you ship from?
A. We ship from Halifax, NS

Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

Q. Do you offer Express Shipping?
A. Yes we can ship your order express. Please send an email and we will provide you with a quote (

Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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