What Is An RV Surge Protector?
RV appliances and electrical systems are expensive to repair or replace, and campground power pedestals can be unpredictable, with faulty wiring or improper setup. Power surges are another risk, occurring unexpectedly for various reasons.
A surge protector is a simple, effective solution to protect your RV’s electrical system. The most common type plugs into the 50, 30, or 20-amp outlet, with your trailer then connected to the surge protector.
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For RV owners regularly using hookups, surge protectors are essential. Choose one based on your RV’s amperage:
- 50-amp RVs: Use a 50-amp surge protector.
- 30-amp RVs: Use a 30-amp surge protector.
- 20/15-amp trailers: Use a 30-amp surge protector with an adapter, as 20/15-amp models aren’t available.
Make sure you match the surge protector to your RV’s amperage for proper protection.
See Also: The Surprising Differences Between 50A & 30A RVs

What Size Of Outlets Can I Plug My RV Surge Protector Into?
30 Amp RV Surge Protector To 50 Amp Outlet
You can plug a 30 amp surge protector into a 50 amp outlet.
Your camper will be protected to the full capacity of the surge protector, and the 30 amp camper will run normally and everything will basically be the same.
Leisure Cords 50 to 30 Amp RV Adapter
All you need is a 50 to 30 amp adapter which you will plug into the 50 amp outlet, followed by the surge protector, then your RV.
50 Amp RV Surge Protector To 30 Amp Outlet
If you have a 50-amp RV, you need a 50-amp surge protector. If you try to use a 30-amp one, you’ll only be able to pull 30 amps of power whenever you plug in.
If a campground only has 30-amp service, you can still plug your 50-amp surge protector into the 30-amp outlet. Just remember, your RV will only be able to use 30 amps because of the outlet.
The good news is that your 50-amp surge protector will still protect your RV from power surges, even when you’re plugged into a 30-amp outlet.
Just use a 30 amp to 50 amp RV adapter to plug the 50A surge protector into the 30 amp outlet.
See Also: Use An RV Surge Protector With A Generator (Open Ground Fix)
30 Amp RV Surge Protector To 20 or 15 Amp Outlet
Always use an RV surge protector, even when plugging into a 20- or 15-amp outlet. Power surges can occur through any outlet, no matter the size, so it’s important to protect your camper.
Keep in mind that a 20- or 15-amp outlet provides a smaller power source. Running high-power appliances like an air conditioner or electric water heater will likely trip the breaker on these lower-capacity outlets.
CircleCord 15 to 30 Amp RV Adapter
To plug a 30 amp RV surge protector into a 20 amp or 15 amp outlet, all you need is a 15 amp to 30 amp RV adaptor.
50 Amp RV Surge Protector To 20 or 15 Amp Outlet
Just like the 30-amp version, a 50-amp surge protector will still protect your 50-amp RV from power surges.
When plugged into a 20- or 15-amp outlet, you won’t be able to run larger appliances, but you can still power essentials like the fridge and keep your batteries charged.
MaxxHaul 15 to 50 Amp RV Adapter
All you need is a 50 to 15 amp adaptor.
See Also: How To Connect/Plug RV Camper Into Generator (15/30/50 Amp)

My RV Surge Protector Recommendations
For a full review with even more choices, check out this article here.
Southwire 50A Full Protection Surge Guard
Southwire produces top-tier RV EMS surge protectors. I use the 30-amp model for my travel trailer, and it’s worked flawlessly, even protecting me from faulty outlets at questionable RV parks.
The 50-amp Southwire EMS offers full protection against power surges, open ground/neutral, low voltage, overheating, reverse polarity, and more. Key features include:
- LCD Screen: Displays real-time voltage and amp draw, clear and easy to read, even in daylight.
- Lockable Design: A sturdy plastic ring allows you to secure it—essential for preventing theft.
- Auto Reset: Restarts after power loss with a 128-second delay and a 10-second start-up sequence.
- LED Indicators: Two green lights confirm proper operation, while a red caution light alerts you to issues.
The unit is rain and snowproof, durable, and highly reliable. I always plug the surge protector in first to test the pedestal before connecting my RV, saving me from setting up at faulty sites.
See Also: What Should My RV Water Pressure Regulator Be Set At?
Southwire 30A Full Protection RV Surge Guard
The 30-amp Southwire Full Protection RV Surge Guard offers the same comprehensive features as the 50-amp model, tailored specifically for 30-amp trailers. The only difference is its compatibility with 30-amp systems. If needed, you can connect it to a 50-amp outlet using an adapter, and it’s the model I trust for my own 30-amp travel trailer.
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Southwire has a well-earned reputation for quality, and I’ve been recommending their surge protectors to RVers for years.
Have questions about RV surge protectors and outlets? Leave a comment below.
Is there any issue with using a 50A surge protector with a 30A RV ?
No that’s not an issue, the surge protector will still protect your RV and it doesn’t care if you only use 30A.
I had 50 amp surge protector hard wired to my rv It will not recognize a 30 amp receptacle any advice?
Hi Al,
It should work. Have you tested multiple 30 amp receptacles?
It could have something to do with the 50 to 30 amp adaptor. If the wiring is a little worn inside the adaptor the surge protector could be reading it as a problem and blocking the power.
You could try a new/higher quality adaptor to see if that helps. Also, ensure all the connections are solid so that nothing will set off the diagnostic part of the surge protector.
We have 50 amp Rv. Camping at a 30 amp spot. We have a 30 to 50 adapter. Now I need a 30 amp power surge cord. Is this correct?
If you already have a 50 amp surge protector for your RV it should work fine. Just plug it into the adapter then the adapter into the 30A outlet.