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  1. RV Surge Protectors
  2. Hughes Autoformers
  3. 50 Amp
  4. Surge Protector
  5. Portable
  6. Bluetooth
  7. Emergency Shut Down
Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp

Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp

Item # HU87FR
Our Price: $346.30
RV Surge Protectors
This item qualifies for Free Shipping
Shipping Weight: 7 lbs
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Keep your RV safe from damage caused by voltage spikes and sustained low voltage. Disconnects power when voltage is low to keep your appliances safe. Downloadable app lets you monitor the connection and diagnose problems from your smartphone. Great Prices for the best rv surge protectors from Hughes Autoformers. Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp part number HU87FR can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (667)
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  • Why etrailer?

Hughes Autoformers RV Surge Protectors - HU87FR

  • 50 Amp
  • Surge Protector
  • Portable
  • Hughes Autoformers
  • Bluetooth
  • Emergency Shut Down
  • 6100 Joules

Keep your RV safe from damage caused by voltage spikes and sustained low voltage. Disconnects power when voltage is low to keep your appliances safe. Downloadable app lets you monitor the connection and diagnose problems from your smartphone.


  • 50-Amp surge protector prevents damage to your RV from power spikes and sustained high or low voltage
  • 4-Second start-up delay gets you up and running faster than other brands
    • Delay makes sure power is safe to use before flowing normally
    • Audible click tells you the surge protector is on
  • Surge protection module offers 6,100 joules of protection in case of lightning strike
    • Can be replaced once it wears out - no need to replace the entire unit
  • Emergency Power Off cuts connection in the event of an error to protect electronics and appliances
    • Shuts down if current drops below 104V or raises above 132V
    • Also cuts power for an open ground, open neutral, reverse polarity, open circuit, or mis-wired connections
    • Automatically turns back on once power is stable for 90 seconds
  • Free Smartphone app for iOS and Android connects via Bluetooth to monitor your system
    • Quickly pair using the QR code on front of device
    • Read volts, amps, and watts in real time to keep an eye on your power draw
    • Get push notification when voltage is outside of acceptable, customizable ranges
  • Easy-to-see indicators show you if there's a problem and what that problem is
    • Watchdog logo illuminates white if power is steady and red if there's an error
    • Error code can be compared to legend on the side of the unit
  • Housing is IP65 rated for protection against dust and rain
  • Metal bracket around cord provides secure place to attach cable lock
  • Easy to use - plug into pedestal to check for a safe circuit and then connect your RV shore power cord
    • Compatible with power cord adapters
  • ETL listed


  • Surge Protector dimensions: 5-1/2" long x 4" wide x 9" tall
  • Cord length:
    • Input: 10"
    • Output: 9"
  • Amps: 50 amps
  • Energy dissipation: 6,100 joules
  • Limited lifetime warranty

Protect your investment

If you aren't using a surge protector, you're taking a big risk. While spikes caused by lightning can damage your electrical system and appliances, there are common electrical issues that can be just as dangerous. Choosing a surge protector with advanced features will help you protect your RV.

Smart Surge Protection

Electrical problems are not uncommon at campgrounds, especially ones where wiring was originally installed decades ago. When a campground is full on a hot day and everyone is running their air conditioners, low voltage may cause a brown-out situation and damage your RV appliances. On the flip side, faulty transmission, bad wiring, or spikes caused by other RVers connecting to a shared line can all lead to voltage issues that may not be significant enough to trip a basic surge protector.

Power Watchdog surge protectors with Emergency Power Off are equipped with computers that monitor voltage and disconnect when voltage is at risky levels. Plus, they automatically reconnect power when power returns to normal. This keeps your RV safe from problems caused by low voltage like motors overheating in fans and air conditioners.

In the event of a major spike, you can replace the surge protection module itself rather than the entire unit. The modules are plugged in without soldering, so you don't need to be an expert electrician to make an easy repair. In fact, the only tool you need is a screwdriver.

Information at Hand

The Power WatchDog smartphone app

The Power Watchdog app lets you connect to your surge protector via Bluetooth. You can monitor your energy usage, making it easy to diagnose any ongoing energy issues you may be experiencing. When voltage increases or decreases to risky levels, you will be notified right away. You can also reset your surge protector without stepping outside.

PWD50EPO Power Watchdog Surge Protector with Bluetooth and Emergency Shut-Off - 50 Amp - Portable - EMS

Replaces PWD50-EPO

Installation Details HU87FR Installation instructionsAlternate Instructions HU87FR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp - HU87FR

Average Customer Rating:  4.8 out of 5 stars   (667 Customer Reviews)

Keep your RV safe from damage caused by voltage spikes and sustained low voltage. Disconnects power when voltage is low to keep your appliances safe. Downloadable app lets you monitor the connection and diagnose problems from your smartphone.


This product saved our toyhauler from going up in smoke ! While Glamping at our friends ranch in Colorado in June of '22 , Lightning struck their main power pole supplying power to the 40 acer property . Our RV was about an eighth of a mile from from the pole . The BOOM and SIZZLE sounds were like none other ! Scared the shizzle out of us ! After the power company restored the service , hit the breaker and the power was back on , no issues . Thank You to our Watchdog !


Well seeing as how it was just purchased ,yes 5 stars, great service , easy to hook up and works great with the Bluetooth with very good range.

After a year my empower Watchdog Surge Protector is still fantabulous, so much so that I purchased another for the 5th wheel we live in when not traveling with our super c. I can monitor either one from inside the 5th wheel while at home.
David - 11/20/2022


Rating is for etrailer, not the Watchdog as I won't be using till January. Communication was beyond a 5 star rating. Never have I had the communication I experienced with this purchase from placing the order to delivery. The Watchdog was priced competively, box undamaged upon delivery, now just waiting to travel to our snowbird destination so I can start using it.

Excellent product. Never felt the need for one til I started traveling. Was some pretty sketchy power poles out there. The app was easy to pair, nice to have the information at my fingertip. The extreme length of the Watchdog hasn’t been an issue, nor has the amount of light emitted from the unit. I also bought the replaceable surge protector part just in case, but haven’t needed it. Overall this was a wise investment!
Vince - 11/11/2022


We used the surge protector for approximately 3 months over the past year. Having the ability to confirm the electricity provided by the campground will not damage my onboard equipment is priceless. The power watchdog is the first thing that gets hooked up when we stop, then I turn on the breaker and look to see if it lights up white for normal conditions or red for a faulty condition. If it is red I request another spot.


I have most of what I need for my RV but when I do need something I go to people who have good products stand by them and are trust worthy and care about there customers.
You people fit that bill for all, sorry to say that is not true for some today, Take Care Have a Great Day, Best to All,

This surge protector has worked very well some may say it costs to much a lot cheaper than a new RV
Jim k - 08/29/2022


Pretty Cool Stuff!
Plugged it in, waiting
for the face to light up, plugged in the camper. Awesome! Everything works, the app works, I can monitor my electrical voltage, current, anywhere. It's pretty cool.


etrailer has been my trusted go to source for RV and trailer needs. Fast shipping and fair pricing.
Looking forward to having surge and voltage protection for our motorhome. Watchdog is a well known and well built product.


I purchased this surge protector after reading other reviews and it has worked flawlessly. Great peace of mind for sure. Fortunately the camp grounds we have stayed at so far were well maintained and had newer style power pedestals with no issues. Also works as a great night light!


This surge protector does the job very well. Plus, the Watchdog is an easy form of alert. Pleased to find it on eTrailer, good price, fast shipping.


Seems to work as advertised , time will tell. Easy to set up and use. Great experience ordering on Not the cheapest price offered on line but definitely a professional site.


We are pleased with the Power Watchdog surge protector. Came within a few days and the app is easy to follow.

The adorable Watchdog Surge protector has been one of our most important upgrades. Hasn't failed us at all.
Rick M - 08/30/2022


Works quite well. Easy to see if something is wrong with the electrical source or use. The dog face turns from white(everything is good) to red if there is something wrong. Turns off power going to my trailer if there is something wrong. Saves my trailer!


So far, so good! We have had a few power disruptions and the Power Watchdog has protected our trailer from possible spiking/low voltage. It comes right back on as it should when power is restored. The only negative is the bright "dog face" on the unit, and the company does offer a sticker which will cover this up. I'll probably just use some tape.


Been using even at home every day. No issues. Glad I have the protection


Delivered on time, package look like it was handled with care as the surge protector is in perfect condition. etrailer kept me informed from purchase to delivery. Very heavy duty looking product. I will do a follow up review when I have a chance to use the product this spring. etrailer sets the standard for excellence!


Has become a cherished piece of equipment. Has worked flawlessly and etrailer and [online] are two companies with great post-sale service.


Watchdog works better than I expected. Nice to be able to check on power situation while sitting in the rv. Again, e-trailer was great. Product arrived 2 days after ordering. Great price, great service.


Has saved our bacon at least once when we got a power surge following a power outage. Being able to reset the device remotely is a nice feature and even better is the the ability to simply replace the surge board rather then the entire surge protector itself. Who wants to spend all that money for a one-time use surge protector. Spend the extra $$ and get this one, your future self will thank you.


I wouldn't plug my rig into a pedestal without having this on first. Traveling full time we've run across some pretty sketchy campground power and thankfully Watchdog hasn't let us down yet.


I love my surge protector. I know all my most valuable electronics are well Protected because of the Watchdog. I would highly recommend this device to anyone who cares about safety and security of their rv


A little bout bulky than I expected but otherwise as expected.

Still working fine.
Thomas M - 01/23/2023


Have not used it yet,but my friend who is an electrical contractor and knows all things electric recommended this after he got one for his rv.I am confident it will perform as advertised.

After 1 year of sporadic usenot traveling as much as we would like due to life happening, it has performed as advertised. It gives me confidence that our 5th wheel is protected from high and low voltage situations, and has kicked the power off a couple times at a busy read full campground when we were at the end of the power grid.Auto reset when voltage stabilized was nice.
Brian - 08/07/2022


Excellent product. It has worked flawlessly for us over the past year, and seeing the status via the app/bluetooth makes it even more convenient.

As others have mentioned, some power poles out there make you suspicious about plugging in. However, I know my rig will be safe with the Watchdog surge protector.


A year is gone by and the protector is up and running like it's nothing. It has save me from a lot of headaches and it paid by itself by now. Great product. Best purchase I have made. Customer support is awesome. Thank you for checking back on me after a year.


Thank you for your service I can’t thanking you enough for helping us

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