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  1. RV Surge Protectors
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Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 30 Amp

Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 30 Amp

Our Price: $238.14
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RV Surge Protectors
Shipping Weight: 4 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 - 30 Amp part number HU77FR can be ordered online at or call 1-800-940-8924 for expert service.
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Hughes Autoformers RV Surge Protectors

  • 30 Amp
  • Surge Protector
  • Bluetooth
  • Emergency Shut Down
  • Hughes Autoformers
  • Hardwired
  • 3000 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.


  • 30-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 3,000 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: 30 amps
  • Energy dissipation: 3,000 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.

PWD30EPOH Power Watchdog Surge Protector with Bluetooth and Emergency Shut-Off - 30 Amp - Hardwired - EMS

Replaces PWD30-EPO-H

Item # HU77FR

Installation Details HU77FR Installation instructionsAlternate Instructions HU77FR Installation instructions

Customer Satisfaction Score:

Customer Reviews

Power Watchdog Surge Protector with Bluetooth and Emergency Shut Down - Hardwired - 30 Amp - HU77FR

Average Customer Rating:  4.8 out of 5 stars   (881 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.


Wired up and functioning properly. Word of warning choose your location wisely, it has a slight hum when operating. I had to do some soundproofing in addition to the installation.



So my concerns about the slight hum were overboard. My wife very keen hearing hasnt mentioned anything about it. With the matress in place its nonexistent. The Surge protection has warned me twice of reversed polarity issues. The Bluetooth connection is worth every penny. I like to see the power consumption as we are using the camper and have a pretty good feeling for the max load where ever we hook up. I will continue to highly recommend this product and if we ever change campers you can bet Ill have another one ready to wire in on the replacement.


After multiple trips we have never experienced a problem with this product.


This surge protector hums very loudly, you could hear it inside the trailer as well as outside. I had to remove it since it made sleeping in the trailer impossible. Neither etrailer nor the manufacturer would replace it or give me a refund.

Etrailer Expert

Katrina B.


I have gotten information back from the manufacturer and they say that typically, you should not hear it from more than 5-6 feet from it, or at least it not being loud at that point. If the humming is too loud past that 5-6 foot radius, this item does have a lifetime limited warranty.


Since installing this thing I’m lucky if I can run my A/C and microwave at the same time because of the damn emergency shutdown feature. Would not recommend or purchase again.

Etrailer Expert

Brooke M.


something to keep in mind is that you would need to be wary of thing like a water heater or a battery charger could be kicking on therefore adding to the amp draw. Just double checking in keeping the total amp draw in mind is key. If those extra things kick on at the same time, that would cause it to use the emergency shutdown.


Installed on by cargo trailer conversion. The cover seems a little flimsy but it is comparable to what was on my previous factory travel trailer.


The unit works as advertised allowing me to see power usage on individual systems. Being able to see input voltage is good and so far, no huge power spikes.


Just love this onboard version of the Watchdog. No more worrying about my expensive piece of equipment hanging out in the campground, lit up for all to see. Also has protected me a few times from overloading and from a faulty ground at one camp.


I really like this unit. All the other reviews are correct: Yes its huge, yes the bulldog logo is super bright. I installed it in an enclosed area on my trailer (Coachman Apex Nano 194BHS) in the water heater compartment (above/away from any possible water leaks), so the size and brightness are not an issue for me.

The Bluetooth range is really good (maybe too good, it reaches halfway thru the house when parked outside). The app is also pretty cool, because you can use it like a Kill-a-Watt by going around the camper turning things on/off (pro-tip: use the circuit breakers for most accurate readings).

Really appreciate not worrying about this expensive gear getting stolen, or forgetting it during setup, etc. Protected from day 1.


Been working great let’s me know if I am close to a over load and if park power in correct.


The Watchdog has taken the guess work out of hooking my RV.


Fast shipping! Easy install on my keystone passport. So far so good. I like this surge protector because it is hard wired inside the rv and eliminates theft of the unit.


Excellent product that has likely paid for itself several times. Would purchase again


Easy installation


promp service thanks




We have been using the Watchdog for the better half of the season since we had to replace our power cable. It had a burnt end due to a poor hookup at a campsite. Nowwe can test our hookup before we connect our trailer. There is also an app that helps monitor the connection. The best thing about the Watchdog is that the replaceable surge protector.


This has really helped me manage my energy using the Bluetooth data to the app, especially when we plug in to 15 amp driveway power. The indicator lights on the unit give me instant test of campground wiring before I plug in the coach. And it has a replaceable surge protection module.


great product. I really like being able to have the app on my phone and see the power usage on it too. being able to replace the part that blows when there is a surge is very handy instead of buying a new unit. id also like to say how awesome and helpful etrailer is also. I needed assistance awhile back and they seemed more than eager to help me.
thank you etrailer for being great and competitive on prices too.


We have a horrible electric setup at our campground . Power surges spikes etc. Blew our inverters well. Bought this to help stop damage in the future . So far it's worked. Had 2 more surges since I installed it. Saved me time money and aggravation. Well worth the money


Watchdog has performed flawlessly over the first year. It is very user friendly and the app is really nice to have. We have used the app to find out actual amps a device uses by plugging it in and watching the app to see how much amps increases by. For example, our camper is 30amp. With AC running we might be using 18amps and then plug in a cooking skillet and amps jump to 28. This we know the skillet requires 10am pjs. This makes it easy to manage our usage. The Watchdog has saved our camper from both low voltage in campgrounds and power surges. As well as times when we tried to run the AC and microwave at the same time. We also appreciate that the device will reset itself after we lower amps to below 30 without us having to walk out to power post and reset. We like the sound when it kicks in and the light assures us it’s working or if there is a problem at the power pole. We feel very good that Watchdog is helping protect our investment.


Just received and put in use. It was as advertised. The app was easy to setup and use. The box the unit came in is designed to also be used to stow and transport the unit, which is a nice bonus!

I look forward to great service from this unit while providing electrical protection for my 5th wheel RV!


I got my new Watch Dog surge protector right away, thanks George and the rest of you at trailer. A loose connection maybe to blame for replacing my old yeller one, but after 6 years it was time to upgrade to something better and I chose this because of all the videos and magazines and the Quartzsite rv show. I chose etrailer because of the customer service has always be great for me, thanks again everyone.


This is a great product. I usually plug it in at the site first, before plugging in or setting up my rig to be sure power is safe. A couple times I exceeded my 30 amps and the Watchdog tripped before the breaker. Nice to be able to check voltage and power consumption from my phone.


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.

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