How it connects
Straight-blade plug pushed in; spring contacts grip the two flat blades and the round/U ground pin by friction. No locking.
Male and female halves
This is the female (receptacle, R) half; the male is the TT-30P plug on the RV power cord. Also made as inline female cord connectors.
Usually connects to
- TT-30P to 5-15R/14-50P adapters
- NEMA TT-30P plug (RV 30 A shore power cord)
Common sizes
- One 30 A, 125 VAC configuration: hot, neutral and ground; flush, surface, pedestal and cord-connector housings.
Where it is used
RV and travel trailersportable generatorsRV parks and campground power pedestalsRV shore powerhome RV hookup outlets
Variations
- flush-mount single receptacle
- surface-mount / outdoor box
- RV power outlet box combined with 5-20R / 14-50R
- weather-resistant outlet box
- cord connector (female inline)
- pedestal combo with 14-50R and 5-20R
How to recognise it
Round face with a U/round ground hole at top and two flat slots below, each angled about 45° to form an inverted V. Usually marked "TT-30R", "30A 125V" and often "Travel Trailer Use Only" or "Recreational Vehicle Use Only".
Often confused with
| Confused with | How to tell them apart |
|---|---|
| NEMA 10-30R / 14-30R (dryer outlets) | Dryer outlets are 125/250 V with an L-shaped or straight vertical slot pattern; TT-30R has two slots angled toward each other in a V below the ground and is 125 V only. A TT-30P will not fit them. |
| NEMA L5-30R | L5-30R has curved twist-lock slots; TT-30R slots are straight. |
| NEMA 14-50R | 14-50R has four contacts (two vertical straight slots, a wider neutral and ground); TT-30R has three. 14-50R has four slots (two straight hots, L-free neutral, ground) and is 50 A 125/250 V; TT-30R has three openings. |
| NEMA 5-30R | 5-30R has one horizontal and one vertical blade slot rather than the symmetric angled V of TT-30R. |
| NEMA L5-30R / 10-30R / 14-30R | TT-30 has two angled flat blade slots forming a chevron above/below a round/U ground at 120 V; L5-30 is twist-lock with curved slots; 10-30/14-30 are 125/250 V dryer outlets with different slot layout (L-shaped neutral or four slots). |
Also called
TT-30 outlet30 amp RV outletRV 30A receptacleTT30RTT-30 receptacle30A travel trailer receptacle
Good to know
TT-30 is 120/125 V only, despite some listings saying 125/250 V. A 240 V supply damages RV equipment. TT-30R can be a wall receptacle or cord connector.
Related connections
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