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

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

Item # HU27FR
Our Price: $224.95
RV Surge Protectors
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Shipping Weight: 5 lbs
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Get on-board protection from power surges and low voltage with this hardwired surge protector. Disconnects power when voltage is low to keep your appliances safe. Monitor your connection and diagnose problems with your smartphone. Great Prices for the best rv surge protectors from Hughes Autoformers. Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 50 Amp part number HU27FR can be ordered online at or call 1-800-940-8924 for expert service.
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Hughes Autoformers RV Surge Protectors - HU27FR

  • 50 Amp
  • Surge Protector
  • Hardwired
  • Hughes Autoformers
  • Bluetooth
  • Emergency Shut Down
  • 4800 Joules

Get on-board protection from power surges and low voltage with this hardwired surge protector. Disconnects power when voltage is low to keep your appliances safe. Monitor your connection and diagnose problems with 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 4,800 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
  • Hardwired installation inside your RV
    • Removes the extra steps of using a portable unit at a park power pedestal
    • Protects the unit from the elements
  • ETL listed


  • Dimensions: 5-1/2" long x 4" wide x 10-9/16" tall
  • Amps: 50 amps
  • Energy dissipation: 4,800 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.

PWD50EPOH Power Watchdog Surge Protector with Bluetooth and Emergency Shut-Off - 50 Amp - Hardwired - EMS

Replaces PWD50-EPO-H

Installation Details HU27FR Installation instructionsAlternate Instructions HU27FR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 50 Amp - HU27FR

Average Customer Rating:  4.8 out of 5 stars   (666 Customer Reviews)

Get on-board protection from power surges and low voltage with this hardwired surge protector. Disconnects power when voltage is low to keep your appliances safe. Monitor your connection and diagnose problems with your smartphone.


So far everything seems to be just as advertised. Install was pretty straight forward. I had to move my transfer box over so I would have room for everything. Product was shipped in a timely manner. I initially tried to purchase from [online store]. They sent me the wrong unit twice. I should have just ordered from etrailer to start with. I also ordered a new 30' cable from them. It came faster than the Watchdog.

I have been using this for a year now with no problems. It let me know at one RV park that the power on one leg was not working. I am happy with my purchase and happy I purchased at Etrailer.
Greg - 11/25/2022


I like that the app allows me
to keep an eye on the voltage of each line coming to my rig along with the amps.
The installation was easy too.


Bought this and installed on the motorhome to save others from "taking it by mistake". It works seamlessly, and the app lets you monitor everything from your phone. The best part...this saved us from possibly having a major electrical repair bill when it detected some crossed wiring in the campground connection. It would not allow the electrical connection, and the app told what the problem was, allowing the park electrician to make an easy fix by simply switching the crossed wires to their correct positions. This is one item that nobody should ever be without.


The unit alerted us when my power cord had a bad plug that could have resulted in afire. Also we had a park in CA that could not provide adequate voltage during the heat wave during Labor Day weekend. While this was sometimes inconvenient, it protected my appliances and electronics. I now have an auto former that should help in that situation going forward.


Recieved order in 3 days w/std shipping in perfect condition. Can't wait to install for added surge/power protection.


On our camper's maiden voyage, one the first campsites we stayed, the electrical pedestal had bad electricity. It was so bad, my Power Watchdog would not allow power into my camper. On my phone was enough details I could explain the problem to the campsite managers. They called their electrician and he spent a half hour replacing bad parts. When he was finished, he thanked me for letting them know because it could have been damaging every camper who has stayed in that site. I feel very safe knowing Power Watchdog is looking out for us.


Item has been working flawlessly since installation. I paired it with the RV Whisper monitoring system and now I can monitor electrical status from anywhere I have internet access


Easy to install, but it’s a strange feeling cutting the power cord. Lost about 8 inches of total length based on mounting location and strain relievers. Bluetooth is a nice addition. Hope it never triggers, but it’s there if needed.

Outstanding! It works as advertised and has alerted me a few times about over voltage. Well worth time money and time to install.
Michael - 08/04/2022


In Florida for 6 months.Went home for Thanksgiving for 10 days. When we got back electric was off. Had electric to trailer, turned breakers off and on to reset but no luck. The next morning I checked watchdog surge protector on Bluetooth said open neutral push to reset. Electric was back on. We a freezer and refrigerator full of food. What a mess. No one in the park lost electric. Not.sure why this happened

I reached out to the manufacturer and they would like to speak with you directly. They will reach out to you.
-- Etrailer Expert Jenny N - 12/26/2022


Hard wired into our Class A. Works great


Excellent packaging. All necessary parts included. Easy installation (depending on your situation). Electrical connections couldn’t be easier. I recommend a no-ox type grease to prevent corrosion from moisture and dissimilar metals. Unit worked perfectly. WiFi to phone works great and is very convenient. Mine is mounted in the basement of a 5th wheel so can’t see it readily. Highly recommend the quality device.


Love the product. After I installed the bulldog I plugged the RV into a circuit from my house and noticed the color was red indicating a problem. I found a bad ground on the outlet and made repairs and plugged it back in and the bulldogs face was white indicating clean power. The app works very well and I can tell exactly how many amps I am drawing either from my on board generator or plugged into a 20, 30 or 50amp service.


Works perfectly, and it’s nice not to have it outside on the pedestal. Install was a bit of work, but not complicated.


Ordered the hard-wired unit to prevent theft at the power post. Install was straight forward, Bluetooth capability was flawless and lets me monitor the surge protector incoming voltage and amperage usage from my phone. Always a pleasure ordering from etrailer.


Easy installation as long as the wire gauge is not too big. Would be helpful if the diameter of the receiving lugs on the unit was a bit larger in diameter.

Performing as advertised. Very reliable product. Being able to monitor the product through the phone app. is a big help.
Kent - 06/13/2022


It has protected our motorhome several times from low voltage. Install was easy.


Great service! I would recommend this to everyone.

I was in a pinch and needed the item I ordered ASAP! They delivered my order a day early saving me time and money.

I know everyone uses other services however you can shop with confidence with


Great product. So much better witha a hardwired unit. Also the connectivity with the app is great.


My UPS box was not damaged. As soon as I opened it up, this is what I got.


Order was filled and shipped quickly. Just as important this product was what I ordered. Another company sent the wrong model and I had to return it. What a hassle. I should have known to order from etrailer first anyway. The always come through the first time.


Order early - rig won’t be here till December. With COVID get it while available. etrailer order/Ship was fantastic. Will order Snap Pads once I know shape/size of feet. etrailer has a new customer!


Love the Watch Dog! I also installed the AutoFormer and mounting hardware. Easy install for most DIYers and hughes theirselves have great customer service. The only issue is, before you hard wire and mount the Watch Dog surge protector, get the serial number off the back of the unit to register the unit for warranty. Yep, learn from others!


I have bought many of these and they are fantastic. This is the only one to buy, THIS IS NO JOKE these are the BEST and cost less than the others, but the best thing is that they are rebuild able by you on site if they have taken a hit and saved your trailer from a costly repair. It also shuts down, if the voltage goes to low or to high which can damage your electrical devices. It will also let you know what is going on when it shuts down. We recommend Hughes to everyone.


I like the lit up dog so you know it has power. Also the phone app is a nice feature.


Very easy to install with good instructions also easy Power Watchdog app.

Show More Reviews

See what our Experts say about this Hughes Autoformers RV Surge Protectors

  • Power Watchdog Hardwire Surge Suppressor UL or ETL rated?
    I reached out to Hughes regarding the # HU27FR Surge Suppressor and they are not UL or ETL rated at this time. Right now (2021) they are being tested for CSA (Canada) safety. My personal opinion is this is the best protection you can buy. It is loaded with features, has a limited lifetime warranty, and is the only device that has a user replaceable surge module - the key to long life protection.
    view full answer...
  • Power Watchdog Bypass Or Standby Mode Possibilities
    I spoke with Hughes Autoformers, and they confirmed that the Power Watchdog Surge Protector # HU27FR is not available to be bypassed or put into standby mode.
    view full answer...
  • How Does Power Watchdog part # HU27FR Let You Know Something is Wrong with RV
    The Power Watchdog part # HU27FR does not have a shut off switch but it does have error codes it will display on the unit as well as will send your phone messages with error info as well if for whatever reason it has to shut down the power to your RV. Also...if there's a problem the dog's face on the unit will go from white to RED.
    view full answer...
  • What Orientation Does The Power Watchdog Surge Protector Need To Be Mounted In?
    The orientation of the Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down # HU27FR that you mention does not matter. This unit can be mounted in any orientation, however it is easier to read if it mounted vertically. I have attached a customer submitted photo showing # HU27FR being mounted upside down.
    view full answer...
    Image 1 for
  • Can Power Watchdog Surge Protector Be Installed After Transfer Switch
    I suppose you can put the Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down # HU27FR after the transfer switch, but this is really intended to prevent surge damage from the shore power connection to begin with so if you install it after the transfer switch you would risk surge damage to the transfer switch itself and potentially your generator. Because of this I recommend installing it before the transfer switch - generators don't pose nearly as much of a threat as the...
    view full answer...
  • Does 50 Amp Surge Protector Offer More Protection than 30 Amp Surge Protector?
    The Hughes Autoformers are certainly the deluxe of all the power protection products. On top of all the low-voltage, high-voltage, Mis-wiring protections they offer - the hardwired units offer protection from thieves! This unit goes inside your coach instead of hanging from the outdoor post. However, buying a 50-amp unit offers no more protection than a 30-amp unit IF your coach or trailer only connects to 30-amps. If your camper only plugs into 30 amp then you should purchase the...
    view full answer...
  • Product Comparison Between The Hughes Autoformers Watchdog And Watchdog Portable.
    The Hardwired Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp Item # HU27FR has to be hardwired and the Portable Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp Item # HU87FR is just a plug-and-play connection. So the portable one is just easier to use than the regular.
    view full answer...
  • Watchdog Surge Protector Compatibility With Generator Use
    The Hardwired Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp Item # HU27FR is compatible with generator use. One thing you will have to note is that some generators have a ‘floating neutral’. This might cause the Power Watchdog EPO surge protectors or any other EMS surge protector to give you an ‘open ground’ or ‘open neutral’ error code and prevent power from going into your RV. If this is the case with your generator you can resolve this by plugging the...
    view full answer...
  • Can I Use the Hughes Autoformer and Power Watchdog Together
    Yes. Using the Hughes Autoformer Voltage Booster with Surge Protection - 50 Amp # HU57FR and the Hardwired Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - 50 Amp # HU27FR together is possible and provides an extra layer of surge protection for your electrical system. You'll want to make sure that you've installed the Autoformer # HU57FR in front of the Watchdog to allow for the full boost to be utilized and not let the Watchdog interfere with anything.
    view full answer...
  • Can Ends of Portable Power Watchdog Surge Protector be Cut Off and Hardwired to Trailer Wiring
    You can cut the wires of the Portable Power Watchdog Surge Protector # PWD50-EPO and splice them together using a terminal block but my contact at Hughes Autoformers mentioned this will void the warranty so you'll want to just connect it per the instructions or return the portable version and get the Hardwired Power Watchdog Surge Protector # HU27FR like you initially planned to do so you remain under your warranty.
    view full answer...
  • Does 50A Power Watchdog Portable Surge Protector Come with Twist Lock Connection
    The 50A Power Watchdog Portable Surge Protector # HU47FR only comes with the standard connectors but if you want to be able to use twist lock connectors you can use the Hardwired Version # HU27FR instead and use a twist lock connection from your trailer to the pedestal. This gives you the same functionality as the portable one aside from being able to seamlessly move it from one trailer to another. Attached are review videos for you to check out.
    view full answer...
  • Operating Voltage of Hughes Autoformers Voltage Booster with Surge Protection
    The Hughes Autoformers Voltage Booster with Surge Protection, # HU57FR will boost voltage by 2% when voltage is between 115V and 114V. It will boost voltage by 10% when the voltage is 113V or below and automatically shuts down when the unit receives less than 90 volts. Yes, the Hughes Autoformer Voltage Booster with Surge Protection, # HU57FR can be used with the Power Watchdog Surge Protector with Bluetooth, # HU27FR. It is advised that you install the Autoformer # HU57FR in front of...
    view full answer...
  • Recommended Hardwired Surge Protector
    Yes, we do have something that will protect your Airstream Travel Trailer. Depending on whether or not you have a 30 amp or 50 amp system you will want one of the following parts. 30 Amp System - Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down item # HU77FR 50 Amp System - Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down item # HU27FR These are hardwired surge protectors that prevent damage to your RV from power spikes and sustained high or...
    view full answer...
  • Is the Hughes Autoformers Voltage Booster with Surge Protection Compatible with a Generator
    No, the Hughes Autoformers Voltage Booster with Surge Protection # HU24FR will not work with your inverter generator. It is designed to be used with a pedestal at an RV park, not a generator. We do not have a voltage booster that will work with a generator. But if you are wanting a surge protector that works with a generator you can use the Power Watchdog Surge Protector # HU27FR. One thing you will want to note is that some generators have a ‘floating neutral’. This could cause the Power...
    view full answer...
  • How to Measure Power Usage for 50 Amp Service on Motorhome
    We have 2 ways that you can accomplish this; you can do it manually or you can use a Power Watchdog device that actively reads and gives feedback to how much power you're using. Calculating this manually means you're looking at all of the different parts of your motorhome that are pulling power and then noting what they are rated to draw and adding all of that up. This can be a little tricky and time consuming but it can be done. The Power Watchdog device, found as parts # HU47FR, # HU87FR,...
    view full answer...
  • How Can I Power My Camper From a Generator With the Hard Wired Watchdog Surge Protector?
    As I am not sure of your specific camper there are a couple options to check out. First the Hughes Autoformers Ground Neutral Bonded Plug for Generators # HU33FR is designed to allow you to plug into your generator without causing the Power Watchdog Surge Protector # HU27FR to fault. The plug inserts into an unused outlet on your generator to create a neutral to ground bond. If your generator is an onboard unit that is hardwired to the camper you will want to install the surge protector...
    view full answer...
  • Will The Watchdog Surge Protector Still Work If You Use A Y-Adapter To Get Power
    The Power Watchdog Surge Protector # HU27FR is just there to cut the power to your RV in the event that the voltage drops below 104v or surges above 132v to protect the electronics is your RV. Changing how the RV gets that power won't affect it as long as it stays within that voltage range. For example, if you were at a campsite with 30 amp service and used a 50 amp to 30 amp adapter like the # A10-5030FBK your RV would only be getting 30 amps and the surge protector would still function...
    view full answer...
  • Recommendations for 50A Service to 30A and 15A Services, and a Secured Surge Protector
    We definitely have some parts you can use for your application but none of them come in an all-inclusive kit. For a 50A to 30A service I recommend the Mighty Cord # A10-3050FHVP. For a 50A to 15A service I recommend the Mighty Cord # A10-1550. Please note when you are pulling power from pedestals that are rated for less power than your camper you'll need to keep track of how much power you're using so you don't overload the pedestal. I've attached a link to a helpful article about power...
    view full answer...

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Info for this part was:

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Installed by:
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