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  1. RV Surge Protectors
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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: $277.65
You Save: $55.35
RV Surge Protectors
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
  • Bluetooth
  • Emergency Shut Down
  • Hughes Autoformers
  • Hardwired
  • 6100 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 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
  • 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: 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.

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   (865 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.


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.



One year later it saved us again. Power Watchdog told us there was no ground, we reported it to the manager and was given another site.


What a great product. Can’t say enough good things about it. We opted for the hard wire and it has been fantastic I do recommend you always carry a spare board just in case. Haven’t had to use it, but it is there in case I need it. Thank you.


The Watch Dog is a great surge protector and ems. Installs easily. The toughest part was reconnecting to my distribution panel due to very tight space. Other than that all went well and is working properly. I really like that if I get a surge the Watch Dog will shut down and protect my camper but unlike the Surge Guard I will not have to purchase a new unit, just the circuit board at a much lower price than a whole new unit. Great job Huges Autoformers on the designing of this unit. I only wish I would have gotten this instead of the Surge Guard.


Package came fast unit looks good the 6/4 wire fit, have not completed install waiting on plug going to put pigtail plugs so I can quickly switch if I ever have an issue. didnt want to cut plugs off wired unit as needed different to fit my coach


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



Its been great to have the protection and having installed inside, no need to plugunplug it in. Its protected us a couple of times for low voltage and reverse polarity. Very happy to have it installed.

Etrailer Expert

Mike L.


@Doug We're glad to hear it's working well for you!


Product has protected us from multiple poor power conditions, and even a failed pin in the power cord. Recently traded rigs and installed another in the new unit before taking it off the dealer lot. App provided good information to show park maintenance the failure mode and issue to get to a quick resolution of the problem. Would recommend.


Box and Product was damaged slightly on arrival. Product looks great though and hopefully works.


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

Etrailer Expert

Jenny N.


I reached out to the manufacturer and they would like to speak with you directly. They will reach out to you.


Works as it should. Saved my Rv from electrical damage. Had problems with low voltage in a campground and it shut the power off and with Bluetooth capability was able to see the problem. Voltage meter and Bluetooth within a couple volts.


Love it works great.


I like the idea of interior mounting, not to worry about theft. It works silently and was an easy install.


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



After 1 year, I can say this product is great. Installed and havent had any issues with it at all. Great piece of mind where we go with our trailer!

Etrailer Expert

Mike L.


@Adam That's awesome, thanks!


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.


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.


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.

Etrailer Expert

Mike L.


Hi Greg, we're happy to hear that the # HU27FR Power Watchdog surge protector you purchased from us is working well for you!


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.


Had it about a year and it has done its job as advertised.


So far been very happy with etrailer and surge protector


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.


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


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



The Hughes Surge Protector looks to be a well built unit. The one time a storm took our power out, our rv was protected. The only problem is I wish Jayco had left me a little more wire to hard mount it in the storage bay.


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


Hard wired into our Class A. Works great


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.


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.

Show More Reviews

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

  • 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
  • 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...
  • 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...
  • 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...
  • 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 Power Watchdog HU27FR Work with 110 or 220 Volts
    Actually the WatchDog # HU27FR is for 120 volt applications. If the voltage is above 132 it will cut power. The 50 amp service at RV parts is actually 120 volt and not the same as in a house.
    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...
  • Troubleshooting An E-6 Error Code With A Power Watchdog Surge Protector
    I spoke with the manufacturer and they stated that if you were using an adapter along with the Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 50 Amp # HU27FR to step down to 30 or 15 amp service that the adapter could be the issue and would explain why you were seeing it in multiple locations. Since you have the hardwired version it is important to also check that you wired it with the correctly to match up with the RV power cord and from the Watchdog...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • Replacement Surge Module for Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down
    The correct replacement surge module for the Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down # HU27FR is the # HU58FR. I attached an installation video below for your reference.
    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...
  • How To Protect The Hughes Autoformer 50AMP Voltage Booster/Surge Protector From Rain and Dirt
    The Rain Cover # HU88FR can be left on the Hughes Autoformer Voltage Booster with Surge Protection # HU57FR while it is in use. If you are setting it on the ground be sure to use a Stand # HU68FR to keep it off the ground. The Hughes Autoformer # HU57FR will automatically resume power to your camper after a outage or surge unless it was damaged by the surge. You can check the lights on the unit to determine if the unit is damaged or the park wiring was damaged from the power surge. We...
    view full answer...
  • Troubleshooting A Hughes Autoformers Power Watchdog Surge Protector Thats limiting Voltage
    If the Portable Power Watchdog Surge Protector # HU87FR was limiting the voltage running to your RV then it's most likely a bad control module and you'll need the Replacement Surge Module for Power Watchdog Surge Protector with Emergency Shut Down # HU58FR. These modules are model specific so you'll want to ensure you're purchasing the correct one for your model. I've listed the modules and their compatible systems below incase you have a different one. The # HU38FR fits the # HU47FR The...
    view full answer...
  • Are Replacement Surge Modules Available For Hughes Autoformers Power Watchdog Surge Protectors
    The Surge Modules for Hughes Autoformers Power Watchdog surge protectors are available but they are specific so to each model so you'll want ensure that you're getting the correct one. The # HU58FR is compatible with the portable # HU87FR and hardwired # HU27FR 50 amp surge protectors. The # HU38FR is compatible with the portable # HU47FR 50 amp surge protector. The # HU98FR is compatible with the portable # HU67FR and hardwired # HU77FR 30 amp surge protectors. The # HU48FR is compatible...
    view full answer...
  • Can the Individual Female Connectors On A Trailer Wiring Harness Be Replaced?
    I went and checked out your order history to see specifically what tow harness you were referring to and I was only able to find the Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down # HU27FR associated with your email. For that product, the only available part for replacement is the Replacement Surge Module for Power Watchdog Surge Protector with Emergency Shut Down - 50 Amp # HU58FR. If you are referring to a normal towing harness, like the Plug-N-Tow Wiring Harness...
    view full answer...
  • Troubleshooting WatchDog E2 Error Code
    The E2 error of your Watchdog part # HU27FR means you have a voltage issue on line 2. The Watchdog has determined that the voltage coming in has either exceeded 132 volts or is below 104 volts. If you press the Live Reading button you can see what the voltage is at this time. Most likely it's low due to the AC drawing a lot. A Softstart will help and since you have a 2 AC setup you'd need the part # SSR44FR.
    view full answer...
  • Adapter Needed To Connect A Travel Trailer To A Honeywell G0059730 Generator
    From what I can find online the Honeywell Generator #60059730 has 20amp outlets on it so you you would just need an adapter to go from your trailer's power cord to the 20amp outlet. If your RV has 30amp service then you could use the Furrion Marine Power Cord Adapter - 30A Female to 20A Male - Black # FP3120RSB.
    view full answer...

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Info for this part was:

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Expert Research:
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Employee Mary K
Written by:
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