Southwire Surge Guard 44390 50 Amp UL/CUL Portable RV Surge Protector with Enhanced Diagnostics
Not Sure If This is the Right RV Surge Protector? We’ll Help You Get It Right.
✔ Talk to a real RV parts specialist
✔ Avoid buying the wrong plug type
✔ Make sure your RV is fully protected
Fast Response. No obligation. We’ll make sure you get the right part.
Not Sure If This is the Right RV Surge Protector? We’ll Help You Get It Right.
✔ Talk to a real RV parts specialist
✔ Avoid buying the wrong plug type
✔ Make sure your RV is fully protected
Fast Response. No obligation. We’ll make sure you get the right part.
Southwire Surge Guard 44390 50 Amp UL/CUL Portable RV Surge Protector provides 4,200 joules of surge protection with enhanced campground power diagnostics for 120/240-volt, 50-amp RV electrical systems.
Its easy-to-read LED fault chart indicates open neutral, open ground, reverse polarity, open circuit or no power, missing voltage on either 50-amp leg, surge-protection status, and overheating at the plug or receptacle.
Need help confirming compatibility? Request a quote and provide your RV’s year, make, model, and shore-power connection.
Confirm Your RV Uses 50 AMP Power
For RVs with 50 AMP (4-prong) power
You’re on the right product if:
✔ Your RV uses a 50 AMP plug
✔ You run multiple appliances (AC, microwave, etc.)
✔ You own a larger RV, fifth wheel, or toy hauler
Description
Southwire Surge Guard 44390 is a portable 120/240-volt, 50 amp RV surge protector with enhanced campground power diagnostics. It provides 4,200 joules of surge protection and is UL/CUL listed for customers who want a listed portable protector with a fully enclosed receptacle cover.
This model is designed for motorhomes, fifth wheels, travel trailers, and other RVs equipped with a standard four-prong, 50-amp shore-power connection. Its LED fault chart helps identify campground wiring and power conditions before you rely on the pedestal connection.
Southwire Surge Guard 44390 Enhanced Diagnostics
The Southwire Surge Guard 44390 analyzes campground pedestal power and indicates several conditions that may affect an RV connection:
- Open neutral
- Open ground
- Reverse polarity
- Open circuit or no power
- Missing voltage on leg 1
- Missing voltage on leg 2
- Surge-protection status
- Overheating at the plug or receptacle
The easy-to-read LED fault chart provides a clear visual reference so you can identify the detected condition without interpreting a complicated digital display.
Key Features of the Southwire Surge Guard 44390
- 120/240-volt, 50-amp RV electrical service
- 4,200 joules of surge protection
- Enhanced campground pedestal diagnostics
- UL/CUL listed
- Fully enclosed receptacle cover
- Easy-to-read LED fault chart
- Missing leg 1 and leg 2 voltage indication
- Overheating plug and receptacle indication
- Increased receptacle brass thickness to help reduce heat
- Easy-T-Pull™ handle with an integrated receptacle
- Anti-theft lock ring built into the cord
- Portable design with no permanent installation required
The Easy-T-Pull™ handle makes this 50 amp RV surge protector easier to connect and disconnect. The integrated receptacle, enclosed receptacle cover, and increased brass thickness provide a practical connection design for campground use.
Is the Southwire Surge Guard 44390 Right for Your RV?
The Southwire Surge Guard 44390 is intended for RVs using a standard 50-amp shore-power connection. A typical 50-amp RV plug has four prongs and supplies two 120-volt legs.
This model may be the right choice when:
- Your RV uses 50-amp shore power
- You want a portable protector rather than a hardwired installation
- You want enhanced diagnostics beyond basic pedestal testing
- You want indication when voltage is missing from either 50-amp leg
- You want surge-protection status indication
- You want plug and receptacle overheating indication
- You specifically want a UL/CUL-listed model
- You want a fully enclosed receptacle cover
Who Should Consider a Different Surge Protector?
The Southwire Surge Guard 44390 is not intended for an RV using a 30-amp, three-prong shore-power connection. A 30-amp RV requires a correctly matched 30-amp protector.
This model is also not a full-protection electrical management system. The manufacturer brochure does not list automatic high- or low-voltage shutdown, delayed power restoration, amperage display, continuous RMS voltage monitoring, or wireless monitoring as features of the 44390.
Customers who require automatic voltage protection and power disconnection should compare Southwire’s full-protection portable or hardwired models rather than relying on the 44390 for functions it does not provide.
Southwire 44390 Compared with the 44290
The Southwire Surge Guard 44290 and the 44390 are both portable 120/240-volt, 50-amp models with 4,200 joules of surge protection and the same enhanced diagnostic conditions.
The principal difference is that the manufacturer identifies the 44390 as UL/CUL listed and equipped with a fully enclosed receptacle cover. Choose the 44290 when those added features are not required. Choose the 44390 when you specifically want the listed model and enclosed receptacle design.
Southwire 44390 Compared with the 44270
The Southwire Surge Guard 44270 is a more basic 50 amp RV surge protector. It provides 4,200 joules of surge protection and checks open ground, open neutral, and correct polarity.
The Southwire Surge Guard 44390 adds enhanced indications for reverse polarity, open circuit or no power, missing voltage on either 50-amp leg, surge-protection status, and overheating at the plug or receptacle. It also adds UL/CUL listing and a fully enclosed receptacle cover.
Southwire Surge Guard 44390 Size and Security
The Southwire Surge Guard 44390 measures approximately 4.25 inches wide, 17.5 inches long, and 4.25 inches deep.
An anti-theft lock ring is built into the cord, allowing the owner to add an appropriate locking method when the protector is connected at a campground pedestal.
Common Questions About the Southwire Surge Guard 44390
Does the 44390 work with every RV?
No. It is designed for RVs with a 120/240-volt, 50-amp shore-power connection. A 30-amp RV requires a properly matched 30-amp model.
Is the Southwire Surge Guard 44390 UL/CUL listed?
Yes. The manufacturer brochure identifies models 44380 and 44390 as UL/CUL listed.
Does it have a fully enclosed receptacle cover?
Yes. The fully enclosed receptacle cover is listed for the 44380 and 44390 models.
Can it detect a missing 50-amp power leg?
Yes. Its enhanced diagnostics indicate missing voltage on leg 1 or leg 2.
Does it indicate whether surge protection is still available?
Yes. Surge-protection status is one of the listed diagnostic conditions.
Does it automatically shut off power during low or high voltage?
The manufacturer brochure does not list automatic low- or high-voltage shutdown as a feature of the 44390. Customers needing automatic voltage protection should compare Southwire’s full-protection models.
Does the 44390 include wireless monitoring?
No wireless-monitoring feature is listed for the Southwire Surge Guard 44390 in the manufacturer brochure.
Learn More About Southwire RV Power Protection
Visit the official Southwire RV power protection website for manufacturer information, or browse our RV surge protectors to compare other 30-amp and 50-amp options.
Need Help Choosing the Correct 50 Amp RV Surge Protector?
Choosing the wrong amperage or protection level can leave you with a product that does not match your RV or the electrical conditions you want monitored. Request a quote and provide your RV’s year, make, model, and shore-power connection. We’ll help confirm whether the Southwire Surge Guard 44390 is the right choice before you order.
