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Yellow thermoplastic elastomer watertight locking plug straight body four blades

Hubbell Incorporated

Hubbell Incorporated HBL28W78 Watertight Locking Plug L18-30P 30 A 120/208V AC

SKU CH-MFDD-18CSX

Watertight locking plug rated 30 A, 120/208 V AC with NEMA L18-30P configuration for industrial three-phase power connections

  • Product typeWatertight Devices
  • Watertight locking plug rated for 30 A 120/208V AC three-phase power
  • Industrial-grade thermoplastic elastomer housing resists chemicals and impact
  • Straight-orientation NEMA L18-30P configuration with four polarized blades
  • Screw-terminal wire connections accept cables from .375 in to 1 in diameter
  • Yellow housing provides high visibility on job sites and in equipment racks

Industrial Watertight Locking Plug

This HUBBELL WIRING DEVICE-KELLEMS plug is a straight, NEMA L18-30P device rated for 30 A at 120/208V AC three-phase power. Its yellow thermoplastic elastomer housing provides chemical and impact resistance for demanding industrial environments. The four-pole, four-blade polarized design ensures secure connections for equipment requiring a locking interface.

Verify Cable Diameter And Terminal Style

Before ordering, confirm your supply cable has an outer diameter between 0.375 in and 1 in to fit the gland sealing range. The device uses screw terminals with standard wiring style, so ensure your installation tools and wire preparation match this connection method. Check that the L18-30P configuration matches the receptacle on your generator or distribution panel.

Sealed Housing Resists Contaminants

The watertight housing seals against moisture and debris when mated correctly, protecting the internal contacts in wet or dusty conditions. Thermoplastic elastomer construction withstands chemical exposure and physical impact without cracking. Screw terminals maintain a firm mechanical grip on conductors, reducing resistance heating under continuous 30 A loads.

How it compares

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

Price $82.99
Pricier than about 64% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameHUBBELL
Product typeWatertight Devices

Questions about this item

What cable diameters does the HBL28W78 watertight locking plug accept?

The plug accommodates cables from 0.375 in minimum to 1 in maximum diameter.

Which NEMA configuration and amperage should I select for a 30 A 120/208 V three-phase supply?

Choose the L18-30P configuration rated at 30 A for 120/208 V AC three-phase service.

How does the 30 A rating apply when the plug is installed in an industrial three-phase circuit?

The 30 A rating is the continuous current capacity per pole on a 120/208 V AC three-phase system when wired to screw terminals.

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