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Yellow watertight locking plug with three blades, straight orientation, thermoplastic elastomer housing

Hubbell Incorporated

Hubbell HBL28W77 Watertight Locking Plug L17-30P 30 A 600V AC

SKU CH-4VER-6VR2Y

Watertight locking plug rated 30 A, 600 V AC with NEMA L17-30P configuration, chemical- and impact-resistant thermoplastic housing accepting 0.375–1 in cables via screw terminals

  • Product typeWatertight Devices
  • Watertight seal protects connections in wet environments
  • Locking NEMA L17-30P prevents accidental disconnection under load
  • 30 A 600 V AC rating suits heavy-duty three-phase equipment
  • Chemical and impact resistant thermoplastic elastomer housing withstands industrial abuse
  • Screw terminals accept cables from .375 in to 1 in diameter

Industrial Three-Phase Watertight Locking Plug

The Hubbell HBL28W77 is a straight-orientation locking plug rated 30 A at 600 V AC for three-phase industrial power connections. Its NEMA L17-30P configuration provides three poles and three blades in a polarised housing designed for demanding job-site and plant environments.

Chemical and Impact Resistant Thermoplastic

The yellow thermoplastic elastomer shell resists chemicals and mechanical impact while maintaining a watertight seal during normal operation. Screw-terminal wire connections accept cables from 0.375 in to 1 in diameter, allowing secure termination without specialised crimping tools.

Straight-Body Form Factor for Panel

The straight body suits inline cordsets or panel-mount installations where a right-angle exit would interfere with adjacent equipment. Polarised blades prevent mis-mating, and the industrial-grade construction tolerates repeated connect-disconnect cycles in harsh conditions.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $69.99
Pricier than about 60% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameHUBBELL
Product typeWatertight Devices

Questions about this item

How do I install the Hubbell HBL28W77 plug on a cable, and what step is often missed?

Strip conductors, insert wires into the screw terminals matching the L17-30P phase arrangement, tighten screws securely, then assemble the housing and tighten the cable gland to seal against the 0.375–1 in diameter range; the missed step is fully seating the gland to maintain the watertight rating.

What maintenance or replacement will the Hubbell HBL28W77 need over time?

Inspect the thermoplastic elastomer housing and blades for cracks, discoloration or corrosion; verify the screw terminals remain tight and the cable gland seal is intact; replace the plug if the housing is damaged, blades are worn, or the watertight seal can no longer be achieved.

What limit appears first when the Hubbell HBL28W77 runs continuously at full load?

The 30 A, 600 V AC rating is the primary limit; sustained operation at 30 A will cause conductor and terminal heating, so the thermal capacity of the screw-terminal connection and cable size becomes the limiting factor before the plug housing itself fails.

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