How it connects
Mating plug blades insert straight into curved receptacle slots and twist clockwise to mechanically lock contacts in place, preventing accidental pull-out.
Male and female halves
The female receptacle has recessed female socket contacts; it mates with a male NEMA L6-30P plug with curved prongs.
Usually connects to
- NEMA L6-30P locking plug
Common sizes
- Standardized NEMA dimensions for 30 A locking devices; face diameter typically approx 1.5 to 1.6 inches (38-41 mm).
Where it is used
data center power distribution units (PDUs)commercial and industrial machineryweldersgeneratorsheavy-duty workshop equipment
Variations
- Flush mount single receptacle
- Cord-mount female connector body
- Isolated ground (IG L6-30R)
- Weather-resistant / corrosion-resistant grade
How to recognise it
Circular receptacle face with three curved slots. The grounding slot has an inward-facing hook/tab feature on the curved arc. The face is typically embossed with 'NEMA L6-30R' or 'L6-30R' along with '30A 250V'.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| NEMA L6-20R | Both are 250V 2-pole 3-wire locking receptacles, but L6-20R is physically smaller and rated for 20 A; plugs and receptacles are keyed differently to prevent cross-mating. |
| NEMA L5-30R | L5-30R is rated for 125V with different blade orientations and dimensions to prevent connecting 125V devices to 250V circuits. |
| NEMA 6-30R | NEMA 6-30R is a straight-blade non-locking receptacle, whereas L6-30R has curved twist-lock blade slots. |
Also called
NEMA L6-30RL6-30R socketL6-30R outlet30A 250V twist-lock receptacle
Good to know
Supplies 250V single-phase power with two hot lines and one equipment ground, with no neutral conductor.
Related connections
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