Protectors that cut power on high or low voltage and miswiring as well as surges.
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Best RV EMS (Electrical Management Systems): 30 amp
- Hughes Power Watchdog PWD30-EPO-H#1 of 8Full review
A hardwired EMS with phone monitoring for 30 amp RVs. A good buy while it sells for less than the Gen II version.
Amazon $226.34$226.34EMS3,000 JHardwired - Southwire Surge Guard 35530#2 of 8Full review
A hardwired 30 amp EMS with a lifetime warranty for about $150. For trailer owners who want theft proof protection.
Amazon $154.97$154.97EMS2,450 JHardwired - Progressive Industries EMS-PT30X#3 of 8Full review
A full EMS for 30 amp trailers at a moderate price, backed by a lifetime warranty. Good for anyone who camps at older parks with shaky voltage.
Amazon $135.88$135.88EMS1,790 JPortable - Hughes Power Watchdog PWD30-EPO#4 of 8Full review
A full EMS with phone monitoring and a replaceable module for 30 amp RVs. Strong value when it sells below the Gen II price.
Amazon $309.99$309.99EMS3,000 JPortable - Southwire Surge Guard 34931#5 of 8Full review
A complete 30 amp EMS with an app and the best warranty terms here. For owners who want everything and don’t mind the price.
Amazon $301.12$301.12EMS2,450 JPortable - Hughes Power Watchdog PWD30EPOHW#6 of 8Full review
A connected hardwired EMS for 30 amp RVs that you can monitor and switch from anywhere. For owners who want theft proof protection with remote control.
Amazon $280$280EMS-Hardwired - Hughes Power Watchdog PWD30EPOW#7 of 8Full review
The most connected portable EMS for 30 amp RVs, with remote shutoff and a replaceable module. For owners who leave the RV plugged in while away.
Amazon $309.99$309.99EMS-Portable - Progressive Industries EMS-HW30C#8 of 8Full review
A long running hardwired EMS for 30 amp trailers. For owners who want protection that is always connected and can’t walk off the pedestal.
Amazon $151.31$151.31EMS1,790 JHardwired
Best RV EMS (Electrical Management Systems): 50 amp
- Hughes Power Watchdog PWD50-EPO-H#1 of 8Full review
A hardwired EMS with phone monitoring for 50 amp RVs. A good buy while it sells for less than the Gen II version.
Amazon $329.99$329.99EMS6,100 JHardwired - Hughes Power Watchdog PWD50-EPO#2 of 8Full review
A full EMS with phone monitoring and a replaceable module for 50 amp RVs. Strong value when it sells below the Gen II price.
Amazon $339.99$339.99EMS6,100 JPortable - Southwire Surge Guard 34951#3 of 8Full review
A thorough 50 amp EMS with a long warranty for big coaches. Worth the premium mainly for the extra neutral protection and the warranty.
Nomadic Supply $399.95$399.95EMS4,200 JPortable - Hughes Power Watchdog PWD50EPOHW#4 of 8Full review
A connected hardwired EMS for 50 amp RVs that you can monitor and switch from anywhere. For owners who want theft proof protection with remote control.
Power Watchdog $399.99$399.99EMS-Hardwired - Hughes Power Watchdog PWD50EPOW#5 of 8Full review
The most connected portable EMS for 50 amp RVs, with remote shutoff and a replaceable module. For owners who leave the RV plugged in while away.
Amazon $399.99$399.99EMS-Portable - Progressive Industries EMS-LCHW50#6 of 8Full review
A compact hardwired EMS for 50 amp coaches with published cutoffs and a repairable design. Worth it when it costs less than the HW50C.
Amazon $158.29$158.29EMS3,580 JHardwired - Progressive Industries EMS-PT50X#7 of 8Full review
A proven portable EMS for 50 amp coaches that does the whole job without an app. A good pick for owners who want full protection for about $200.
Camping World $199.99$199.99EMS3,580 JPortable - Progressive Industries EMS-HW50C#8 of 8Full review
The standard hardwired EMS for 50 amp coaches at under $200. Best for owners who are happy to install it once and forget it.
Amazon $188.99$188.99EMS3,580 JHardwired
