Inline surge protection in the adapter body, so the pedestal joint is protected without a separate device on the cord.
| Plug / Connector Standard: | NEMA TT-30P to NEMA 14-50R |
| Maximum Current rating: | 30A to 50A |
| Maximum Voltage: | 125V/250V |
| Number of Poles and Wires: | Plug: 3 prong 2 poles 3 wires / Socket: 4 prong 3 poles 4 wires |
| Surge Protection: | Inline element housed in the adapter body |
| Indicator and Cover: | Not fitted. The version with the indicator adds an LED indicator and weather cover |
| Housing Material: | PA66 |
| Blade Material: | Nickel Coated Brass |
| Flamability Rating: | UL 94V-0 |
| Color | As shown. Custom colours available to order |
| Safety Certification: | UL 817, UL, cULus |
| Environmental Certifications: | RoHS, REACH |
| Testing: | Hi-Pot (Dielectric Withstanding Voltage), Polarity (pinout) and Continuity |
| Country of Origin: | Made In China |
| Packing: | Standard Export Carton |
This is the 30 to 50 amp RV adapter with surge protection: a NEMA TT-30P plug for the 30 amp pedestal receptacle, and a NEMA 14-50R socket that accepts the four-wire cord of a 50 amp coach.
It is the adapter you carry when the park only has 30 amp hookups and your trailer came with a 14-50 inlet. Electrically the feed is 125V at up to 30A, so 120V loads run and 240V appliances do not. The trailer distribution panel decides how the load is shared.
Typical case: a 50 amp fifth wheel at a 30 amp site. Plug the NEMA TT-30P into the pedestal, then the coach cord into the NEMA 14-50R. It also works as a 30A source adapter for a 14-50 welder or generator inlet fed from the same pedestal. Where the site has full 50 amp service, use the 50 amp NEMA 14-50P to NEMA 14-50R adapter instead of stepping down.
Know what you are stepping down to. If the 14-50 inlet feeds 240V equipment, a 30 amp pedestal will not run it. Check the panel schedule or the appliance nameplates before you rely on the adapter at a 30 amp site.
The NEMA 14-50R socket is a 125/250V four-wire configuration. Fed from a NEMA TT-30P, only the 125V path is live.
Common questions about NEMA TT-30P to NEMA 14-50R RV surge adapters
No. The feed from a 30 amp pedestal is 125V and up to 30A, so 120V appliances run and 240V appliances do not. The adapter changes the connector, not the supply.
The 30 amp NEMA TT-30R receptacle used at RV parks. It will not fit a 50 amp NEMA 14-50R receptacle, and it will not fit a household 5-15 outlet without another adapter, which is best avoided.
Not at the same time. The supply caps at 30A, and two roof units plus a fridge can pass that quickly. The usual approach is to run one unit and shed the other loads, which is what the coach panel is there to manage.
Electrically yes. The version with the indicator adds LED indicators on the housing and a weather cover over the NEMA 14-50R socket. If you do not need those, the plain build is the same connection for less.
