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Yellow industrial watertight locking plug with three blades and screw terminals

Hubbell Incorporated

Hubbell Incorporated HBL28W49 Watertight Locking Plug L7-30P 30 A 277V AC

SKU CH-3B00-SSS3Q

Watertight industrial locking plug rated 30 A, 277 V AC with NEMA L7-30P configuration, screw terminals and chemical- and impact-resistant thermoplastic housing for cable diameters from 0.375

  • Product typeWatertight Devices
  • Watertight seal protects connections in wet environments
  • Chemical- and impact-resistant housing withstands harsh industrial use
  • Locking L7-30P configuration prevents accidental disconnection under load
  • Rated 30 A at 277 V AC for demanding power applications
  • Accepts cable diameters from .375 in to 1 in for flexible installation

Hubbell L7-30P Watertight Locking Plug

The Hubbell HBL28W49 is a watertight locking plug rated for 30 A at 277V AC. It uses a NEMA L7-30P configuration with two poles and three blades. The straight-orientation housing is made from yellow thermoplastic elastomer. Industrial-grade construction provides chemical and impact resistance for demanding environments.

Upgrade from non-locking or non-watertight plugs

This plug replaces standard straight-blade connectors that can loosen under vibration or admit moisture. The locking mechanism secures the connection in temporary power setups, generator hookups, or outdoor distribution. The jump is worth it when code requires a watertight, polarized device for single-phase loads up to 30 A.

Cable range and headroom

Screw terminals accept conductors sized for cables between 0.375 in and 1 in outside diameter. The 30 A rating provides headroom for continuous industrial loads at 277V AC. It runs out when the application exceeds the single-phase, two-pole NEMA L7-30P specification or requires a higher current rating.

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Price $55.99
Typical for this category: the median of 1,135 items is $54.99.

Specifications

Product
Brand nameHUBBELL
Product typeWatertight Devices

Questions about this item

What cable diameter range does the HBL28W49 watertight locking plug accept?

The plug fits cables from 0.375 in to 1 in outer diameter, using its screw-terminal housing and gland nut.

How do you install the L7-30P plug, and what step is often missed?

Strip conductors to the length marked on the housing, insert each wire into its labelled screw terminal, tighten screws to the specified torque, then seat the gland nut and housing seals before final tightening.

Which parts of the yellow thermoplastic-elastomer housing need periodic inspection or replacement?

Check the gland-nut seal, housing gasket and locking-ring threads for wear or chemical damage; replace the seal kit if the watertight rating is compromised.

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