SmartPlug RV Power Inlet - 50 Amp - Black

Part Number: SM56FR

239 Reviews | 10 Questions

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smartplug shore power inlet 50 amp standard connector

smartplug shore power inlet 50 amp standard connector sm56fr

smartplug shore power inlet inlets standard connector rv - 50 amp black

smartplug shore power inlet inlets rv - 50 amp black

smartplug shore power inlet 50 amp rv sm56fr

smartplug shore power inlet inlets 50 amp rv - black

smartplug shore power inlet standard connector rv sm56fr

smartplug shore power inlet inlets 50 amp

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Get your ride SmartPlug ready. Replaces the fiddly twist lock inlet with a more secure and safe connection. Plug in with ease and have one less thing to worry about. Installs into the same footprint as a standard inlet with no modification needed. Great Prices for the best shore power inlet from SmartPlug. SmartPlug RV Power Inlet - 50 Amp - Black part number SM56FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

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Reviews (239)
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SmartPlug Shore Power Inlet - SM56FR

Features:

Inlet lets you plug in your SmartPlug cord to power your RV or boat
- 4-Prong male inlet accepts SmartPlug 50-amp female connectors (sold separately)
- Cables lock in place for secure connection
Straight-in, single-step operation means no more twisting or fiddling with locking rings
- Plug shape takes guesswork out of connecting so it's simple to use, even in the dark
Flat electrical pins increase contact area compared to curved pins in twist locks
- Reduces heat caused by electrical resistance
Inlet cap snaps down onto plug body when in use to reduce strain
- Helps stop plug from being yanked out accidentally
Rubber seal keeps inlet safe from the elements when not in use
High-quality materials hold up in extreme climates or out on the water
- Marine-grade stainless steel components hold up season after season
- Nickel-plated brass electrical pins and tinned wires resist corrosion
- Plastics are UV and heat resistant Valox 553U resins
Easy installation - sized to fit standard inlets so you can use the same screws and holes
Black color
Made in the USA

Specs:

Amperage: 50 amps
Voltage: 125/250 volts
7-Year warranty

SmartPlug vs. Twist Lock

RV and boat owners have long relied on Twist Lock style connections for powering their rides. For years, it has been the best option for connecting to shore power. It's been reliable, but most know it's not without disadvantages:

Curved pins make minimal surface contact, increasing the amount of heat generated
Locking ring can be prone to breaking, cross threading, and stripping out
Faulty locking ring puts strain on the connection
Wear and debris can loosen the fit, further decreasing surface contact
Circular plug shape isn't user friendly and takes some awareness of the orientation of the pins to insert correctly

SmartPlug's connector addresses each of these concerns and does all of the heavy lifting.

Locking arms grab the inlet, a clamp inside the plug body holds the cord, the inlet cap snaps to the top while in use, and the integrated seals weatherproof the connection. This helps prevent the wiggly, dirty connections that increase electrical resistance, which creates potentially dangerous heat.

Since it uses a square plug face, SmartPlug is able to use flat pins which create far more surface contact, further reducing the risk of high heat and electrical arcing. The square shape and flat pins also make it easy to plug in - no more twisting or guessing if the pins are lined up correctly.

BM50PB SmartPlug 50 Amp - Non-Metallic Inlet w/ Black Cover Assembly

Customer Satisfaction Score:

96% were satisfied with this product

4% of customers were not satisfied

Product did not meet expectations
Defective
Did not arrive in time

4% of customers were not satisfied

Product did not meet expectations
Defective
Did not arrive in time

4.8

239 reviews

5 Stars		(205)
4 Stars		(24)
3 Stars		(5)
2 Stars		(0)
1 Star		(5)

by: Dwain 06/14/2026

The quality and design is fantastic. The cover feels soild not flimsy or cheap. Easy install . Have not taken it out yet but looking forward to going out and not dealing with the threaded ring that never felt secure.

Click to Enlarge

Lazer S.

6/16/2026

Glad you like it, Dwain! These are definitely nicer than the screw in style connectors. What did you install it on?

by: James 09/16/2025

I'm giving this Smartplug cord and the Smartplug male trailer wall socket a 4-star rating, but not because the product isn't EXCELLENT. IT IS! On this 2-week camping outing, we have nearly lost our 37-ft. Rockwood Signature travel trailer TWICE to fire, due to the common, everyday 'Twist LOC" RV socket and matching cord overheating while operating our 50-amp trailer on 30 amps (coming between 2-3 amps of 30 amps, but not OVER 30 amps.) The standard 50 amp female power cord end and male plug installed into the side of the trailer MELTED while running on 30-amp service, drawing 26 to 28 amps continuous when both A/Cs were cycled on at the same time. Neither the cord itself nor the trailer's power feed cable ever got hot--ONLY THE CONNECTION where the power cord and trailer plug MEET. It nearly started a fire in the rear wall of our trailer. Melted wall insulation, charred the edges of the fiberglass siding and nearly burned the underlayment underneath the skin. Fortunately, it was NOT a wood product. Both the female cord end and the wall connector plug were melted and charred. Both were replaced by the mobile RV tech who does all of our RV work (I am disabled.) The new cord and trailer plug then melted again 24 hours later. I ordered this Smartplug cord and trailer plug from Etrailer and got it in 4 days. Since new Smartplug cord & plug were installed, I am still pulling 25-28 amps when both A/C compressors are running, but I can feel very little heat on the outside or inside (where the trailer wiring is run into the wall), and the highest temperature I've recorded with the laser temperature gun is 102.5 degrees (high air temperature has been 95 degrees). PROBLEM SOLVED!! The only reason I gave these Smartplug items 4 stars is because of their COST!! The 30ft. Smartplug trailer cord and accompanying male trailer wall socket cost me $718!!! That's pretty close to RIDICULOUS!! They DID, however, SOLVE MY OVERHEATING WIRING CONNECTION PROBLEM!! Read the Smartplug ads and watch their YouTube video from eTrailer (can be reached on eTrailer's website). THEY AREN'T LYING!! Smartplug saved our very expensive RV!!

James One Year Later

9/22/2026

Im glad to say that we have had no more near-fires since changing our twist-lock power connection and cord to the Smartplug items. For $718, we should have no more near-fires FOREVER!

by: Matthew 04/09/2026

2024 Keystone Cougar Half-Ton Travel Trailer

awesome product, highly recommend, etrailer has been great through the whole processit took about 45 minutes to install as my 5yr. old great grandson was helping me,

by: Brett 12/01/2025

Can’t wait to complete my conversion to the SmartPlug. Good to know etrailor s there aren’t f I need help
With the install.

by: Michael 01/23/2026

2017 Ford F-350 Super Duty

This was so easy to install. I am so glad I changed my RV over to this plug and cord. Fit perfectly and the cord is flexible. I would encourage everyone to change out from the old setup.

by: Abel G 05/31/2024

arrived on time, already installed on my enclosed trailer conversion to laundry room :D

by: Kimbra 08/18/2026

by: Michael 05/28/2026

2024 Ford F-350 Super Duty

by: Austin 07/28/2026

by: Glenn 08/14/2025

by: Kit 09/13/2021

by: switz 05/07/2026

I thought this was rather expensive until I received it. Very well built and so much more solid than the plastic one that came on my 5th wheel. My only complaint is that I wish there were an option for a 90-degree bend so the cord would hang from the plug rather than stick straight out. The weight of the 50AMP cord may cause an issue over time, but we will have to wait and see. My old connector was at 90 degrees, and it appears they offer this in the 30AMP option.

Click to Enlarge

by: Michael 11/29/2024 One Year Later

Easy to install and so much better of a system to hook up power, plug and go. Highly recommend the Smart Plug for safety and ease of use, plus looks good too.

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Michael One Year Later

11/30/2025

A must upgrade for a camper!

by: Lore 09/26/2026 One Year Later

Would highly recommend that anyone who has a cheap 30amp shore power connector and cord replace with the SmartPlug. It's a much more secure connection.

by: Gerry 10/05/2026

This is the third smart plug I have purchased. It is an excellent product. One small issue with all three orders is that it was short on quantity of screws. I had to find my own to complete the assembly. I still highly recommend this plug to replace the typical twist lock style which can fail and cause a fire.

Click to Enlarge

Robin H.

10/7/2026

Glad to hear you've been happy with the upgrade. Thanks for pointing out the missing screws, we'll definitely look into that.

by: JDNSr 09/17/2026

Smart plug arrived missing set screw. I called Smart Plug customer service number and was told they would immediately send a replacement for the missing set screw to my home. I will not be home until November.
I asked if they would send a replacement next day and was told no they don’t do that.
I now have a smart plug to replace my defective factory plug that I can not install until November.
This is in no way an e-trailer problem.
e-trailer has done nothing wrong.

by: Dennis 10/08/2026

This product is what should be on every RV period. Had to purchase this because old twist on collar became difficult to tighten and cross threaded easily on starting. Installation is very simple. Color coded terminals so it’s easy to make sure wires are installed where they are supposed to be. Lots of videos on social media/YouTube if you have trouble. One thing to remember is to keep the old screws because you will need them to reinstall inlet. Highly recommended!!

by: Jeff 05/01/2024

This Smart plug inlet plug is true to size. I've used the Smart Plug system on other RVs and am familiar with the better contact area. I was delighted to see that this plug fit inside the connection center of my campervan, and still be able to close cover with no bulging.

Click to Enlarge

Jeff F. One Year Later

5/2/2025

We continue to enjoy this smart plug conversion. It has been no problem and the item is like new from moderate use. Our manufacturer has added this feature on the newest model year, they must have noted many of us converting. I would buy this again from E-Trailer.

by: Laura 06/03/2026

This is the exact part I needed to replace the original Smart Plug receptacle on my 2023 Basecamp 16x (which became damaged due to a loose wire). Customer support, price, and shipping speed from etrailer was great. I will say the new rear cover on this item was a little tricky to install, but it was doable with a little patience.

by: Stephanie 08/10/2026

2022 Forest River Cherokee Grey Wolf TT Toy Hauler

Perfect replacement for the burned out forest river ring version- the indicator light is awesome and secure click locking mechanism guarantees there is positive contact!

by: Douglas 06/06/2026

2020 Chevrolet Silverado 3500

The installation and instructions were straightforward on this plug. Very happy with e-trailer shipping as well. Always on time and the package always looks good when arrives. The trailer you know what you're doing. Definitely keep up the awesome work.

by: Earl 09/03/2026 One Year Later

So much easier to connect and disconnect. This should come standard on all RVs.

by: Shawn 04/28/2025 One Year Later

I like this way more than the old twist one. Like the 2 levers on the sides that lock it in. Color coded for simple hook up, made my own 15/20amp dog bone in addition to my 50amp. Not looking back.

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Brooke M.

5/1/2025

It looks great, Shawn! Thanks for sharing all the photos--it's nice to see how things look in real life :)

by: Old Scout 06/16/2026

I just installed the smart plug on my Airstream this morning. It was very straightforward with the instructions. This new smart plug is easier to deal with when you are attaching it to the cable with the way the lock nut holds the cable in place going into the back of the plug.That was a pleasant surprise. I like the new design. Pleased so far!

by: Richard 07/14/2023

I found the installation of the inlet easy and the modification of the connector very easy. The instructions were very easy to follow and very comprehensive.

The only issue was the rear cover (pictured) for the inlet could not fit at the front location of may 2019 Airstream Flying Cloud 27 ft. FB. I also installed the cable port.

Click to Enlarge

Richard One Year Later

7/15/2024

I love the easy of operation and how well it holds the power cord. I have had no issues!

239

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See what our Experts say about this SmartPlug Shore Power Inlet

Do you have a question about this Shore Power Inlet?

Recommended Smart Plug 50amp RV Power Cord to Work w/a 30 amp 240V Generator
Hey Pat, congrats on your new trailer. Since you're converting over to a 50 Amp SmartPlug RV Power Inlet like item # SM56FR, you can use the SmartPlug Marine Power Cord Adapter - 50 Amp Female to 30 Amp Male Twist Lock Connector item # SM43VR This 4' adapter lets you connect your 50-amp SmartPlug cord to a 30-amp twist lock. It is only rated to 125 volts though. We also have the SmartPlug Angled RV Power Cord - 50 Amp - 30' item # SM54SB. You'll need to use the Mighty Cord RV Power Cord...
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Is SmartPlug 50 Amp Female Plug Assembly Available By Itself
Thanks for reaching out, Glen! To get the plug side of the SmartPlug RV Power Inlet - 50 Amp # SM56FR you were looking at, you just need the 50 Amp Female Plug Assembly # SM36FR.
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Does the SmartPlug RV Power Inlet Require a Special Cord to Connect From Shore Power
Yes. In order to use the SmartPlug Replacement RV Power Inlet - 50 Amp # SM56FR you will need to replace your old twist lock power cord with a SmartPlug RV Power Cord - 125/250V - 50 Amp - 30' # SM86FR.
view full answer...
What is Max Wire Gauge that Can be Used with SmartPlug RV Power Inlet # SM56FR
Hey Wayne, so SmartPlug recommends that you use 6 gauge wire with the SmartPlug RV Power Inlet # SM56FR but they don't list a max gauge. I would just go with 6 gauge and you'll be good.
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2 Holes Stripped Out When Installing SmartPlug RV Power Inlet 50A Hookup On Travel Trailer
Hey Mike, thanks for your continued business, and sorry for your troubles. The SmartPlug RV Power Inlet - 50 Amp - Black # SM56FR just has pass through holes so the part itself isn't stripped, so you'll need to focus more on the RV wall side of things if that makes sense. That is where the bolt holes are that are getting stripped or too large so that the screws aren't staying in. A few solutions come to mind. One solution, which is probably the best, is to use some wood filler or some...
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Does etrailer Offer Any RV Power Cords Made In The United States
Yes, the SmartPlug line of power cords and all of their other accessories are all made here in the United States. Since you were looking at a 50 amp power cord you would need the SmartPlug RV Power Cord - 50 Amp - 30' # SM86FR along with the correct power inlet. Since you have a 2018 Airstream Flying Cloud Travel Trailer you'll most likely want the stainless steel inlet # SM79FR, but we also have a few other color options if you'd like: Black # SM56FR White # SM89FR Gray # SM29FR
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90 Degree Angled SmartPlug Connector For Inlet
Hi George, That’s a great question. The SmartPlug RV power inlet kits only come with straight connectors there isn’t a 90 degree connector sold separately by itself. The only 50 amp 90 degree angled cord SmartPlug currently offers is part # SM54SB. If you wanted to go that route, you could pair it with the SmartPlug 50 Amp Power Inlet in black, part # SM56FR. If your main concern is stress on the inlet, SmartPlug systems are actually designed to reduce that. Unlike traditional twist-lock...
view full answer...
Power Inlet Needed To Add Shore Power To An Enclosed Trailer
If you're only wanting to setup AC service in your enclosed trailer then you could choose pretty much any 30 or 50 amp power inlet you wanted and then just run the appropriate gauge wire between the inlet and your panel. You can definitely install a 50 amp inlet and then just use a 50 amp to 30 amp adapter whenever you're at a site with only 30 amp service. You could use the Mighty Cord Replacement RV Power Inlet - White # A10-50INVP or # A10-50INBKVP for black. You'd need a minimum of...
view full answer...
Where Are Mighty Cord Power Cords Made?
The Mighty Cord RV Power Cord # A10-5025ED90 is made in China. Don't let this discourage you though. This is a well built and sturdy power cord and I have not had any issues with their products brought to my attention. That said, if you are looking for American made products, we do have the SmartPlug line available. The SmartPlug RV Power Cord # SM86FR would be the most similar to the Mighty Cord you were looking at, but SmartPlug uses a proprietary male port so you would also need to...
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Is Box Needed To Install SmartPlug RV Power Inlet?
All of the SmartPlug RV Power Inlets such as the # SM56FR you were looking at attach directly to the exterior wall of your RV, and there is no box compatible with them. I included a video of this plug being installed for you to take a look at.
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Do you have a question about this Shore Power Inlet?

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