30A or 50A RV surge protector?

Buy the surge protector that matches your RV’s shore-power plug. An adapter only changes the plug. It does not protect the coach.

How to tell

  1. 30-amp is a 3-prong RV plug (TT-30), 120V. Common on many travel trailers.
  2. 50-amp is a 4-prong plug (14-50), 120/240V. Common on larger coaches with two ACs.

Look at the plug on your RV cord, not the pedestal. If they do not match, you may also need a dogbone. That is a separate part.

What to buy

Plug order: pedestal → surge protector → RV cord. Check the LEDs before you plug the coach in.

30-amp surge protector

Your RV is 30A

Use a 30-amp portable surge protector. The Progressive Industries SSP-30XL is a 30A / 120V plug-in unit with wiring-fault lights (open ground, open neutral, reverse polarity).

See the 30A surge protector on Amazon

50-amp surge protector

Your RV is 50A

Use a 50-amp portable surge protector. The Progressive Industries SSP-50X is a 50A / 120/240V plug-in unit with the same class of wiring-fault lights, dual-line on 50A.

See the 50A surge protector on Amazon

Adapter only

If the pedestal does not match

A dogbone is not surge protection. Camco 55185 (30A male TT-30P to 50A female 14-50R) lets a 50-amp RV plug into a 30-amp pedestal. You are then limited to that 30A / 120V supply. You still want the 50A surge protector on the RV side of the connection.

A 30A RV on a 50A pedestal needs the other direction of adapter. That SKU is not on this page.

See the 55185 dogbone on Amazon