Product Overview
Thirty amps, three phases, five wires, and one plug that only fits one way
Condition
These are new and unused in the original Hubbell box. The box itself has taken wear from storage and handling, and the photos show it honestly: scuffed corners, torn edges, shelf soil on the yellow stock, and a printed instruction panel dated 06/00 with reference PD1730. None of that reaches the plug inside. On the sample photographed, the four curved blades and the round ground pin read clean and unmarked, the terminal pockets are empty with no wire landed on them, and the cord grip clamp and its screws are present. Photos 1 through 7 show that sample separated into its black outer shell, its body, and its cord grip, which is how the terminal side and the cord entry become visible; that is the same way the plug opens for wiring. Stock here is more than one, so the unit in these photos is representative of the stock, and each plug is sold individually.
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Product Overview
The Hubbell HBL2811 is an HBL Insulgrip twist-lock plug rated 30A, 3 phase Y, 120/208 VAC, wired 4 pole and 5 wire grounding, and the box label names the NEMA L21-30P configuration, which mates with L21-30R receptacles and connector bodies. The part identifies itself in two places even with the box gone: HBL2811 30A 3-phase Y 120/208VAC printed in blue on the collar, and 30A 120/208V 3-phase Y molded into the blade face. Four curved blades carry the three line conductors and the neutral, with a round pin for equipment ground, and the terminal side is stamped X, Y and Z for the lines. The wiring table printed on the box assigns the green hex head screw to the equipment grounding conductor, the white screw to the grounded neutral conductor, and the brass or black screws to the ungrounded line conductors. The cord grip chart on that same panel gives three ranges: 0.60 to 0.85 inch (15 to 22 mm) as shipped, 0.35 to 0.60 inch (9 to 15 mm) with the insert rotated 180 degrees, and 0.85 to 1.15 inch (22 to 29 mm) with the inserts removed. The label also carries UL Listed 231A, a CSA mark, Federal Specification W-C-596G, a note that this catalog number replaces catalog number 2811, and Made in U.S.A. Assembled dimensions, conductor gauge range and terminal torque are not confirmed here, so verify those against the Hubbell datasheet before use.
Key Features
- Hubbell HBL2811 HBL Insulgrip twist-lock plug, catalog number printed on both the body and the box label
- 30A, 3 phase Y, 120/208 VAC, printed on the collar and molded into the blade face
- 4 pole, 5 wire grounding; NEMA L21-30P configuration per the box label
- Color coded terminals: green hex head for equipment ground, white for neutral, brass or black for the X, Y and Z lines
- Cord grip covers 0.35 to 1.15 inch (9 to 29 mm) depending on insert position, per the chart printed on the box
- Translucent body with a black outer shell carrying a fine ribbed knurl grip band; the shell is held by two long screws, and the cord grip clamp and its screws are present
- UL Listed 231A, CSA marked, Federal Specification W-C-596G
- Made in U.S.A.; replaces Hubbell catalog number 2811
- Sold each, new and unused, in the original Hubbell box
Applications
- A stage electrician making up a new L21-30 feeder tail for a portable distro instead of waiting on a rental cable
- A facilities tech replacing the damaged plug end on a 120/208V three-phase rack PDU whip
- A generator shop terminating a 30A three-phase cordset for a rental unit that has to match the customer's receptacle
- A plant maintenance electrician keeping one spare L21-30P on the shelf for the machine cord that keeps getting dragged across the floor
Frequently Asked Questions
What does the HBL2811 mate with?
It is the male plug half of the NEMA L21-30P configuration named on the box label, so it mates with L21-30R receptacles and connector bodies. Four blades carry the three lines and the neutral, and the round center pin is equipment ground. NEMA locking configurations are deliberately not interchangeable, so this will not mate with an L14-30 or L15-30 device.
What size cord will the grip accept?
The chart printed on the box gives three ranges: 0.60 to 0.85 inch (15 to 22 mm) as shipped, 0.35 to 0.60 inch (9 to 15 mm) with the insert rotated 180 degrees, and 0.85 to 1.15 inch (22 to 29 mm) with the inserts removed. Conductor gauge range and terminal torque are not confirmed here, so verify against the Hubbell datasheet before you wire it.
Which terminal takes which conductor?
The box wiring table spells it out: green hex head screw for the equipment grounding conductor, white screw for the grounded neutral, and brass or black screws for the ungrounded line conductors. The terminal face is marked X, Y and Z for those three lines, and the green ground terminal sits in the center, which you can see in the terminal-side photo.
Why is the plug shown in pieces?
So you can see what you are buying. The photos separate the black outer shell, the body and the cord grip to show the terminal side, the blade face and the cord entry. That is the same way the plug comes apart for wiring, and every piece of hardware is accounted for in the frames.
Why buy these here instead of a case pack?
Because you can take the count the job actually calls for. One plug for a single cord end, or two if you are making up a pair of tails, without committing to a distributor case quantity that spends the next decade in a drawer. Each one is sold individually in its own Hubbell box, and the configuration is photographed down to the catalog label so there is no guessing about which of the twist-lock patterns is on its way to you. This one clears our free shipping line on its own, and orders leave our Idaho warehouse the same or next business day.
The translucent body is a quiet favor when you are checking a five wire termination in a dim electrical room. Land X, Y, Z, neutral and ground, twist it home, and whatever is at the far end of that cord finally gets all three legs the way it expects them.
