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Green cylindrical inline connector with raised alignment arrow and double set screw terminals

Hubbell Incorporated

Hubbell Incorporated HBL400MGN Single Pole Inline 400 A Male Green

SKU CH-2DBQ-RB1GX

A 400 A single-pole inline male connector for 2/0–4/0 AWG cable, rated 600 V AC / 250 V DC with double set-screw terminals and thermoplastic elastomer housing

  • TypeWiring Devices
  • Rated 400 A for high-power distribution
  • Double set screw ensures secure conductor connection
  • Thermoplastic elastomer housing withstands demanding conditions
  • Compatible with Series 15 and 16 Insulgrip devices
  • UL Listed and cUL Listed for code compliance

Single Pole Inline Connector

The Hubbell HBL400MGN is a single pole inline connector rated for 400 A at 600V AC or 250V DC. It accepts cable sizes from 2/0 to 4/0 AWG using a double set screw terminal. The male connector features a green thermoplastic elastomer housing and brass cam contact. It is designed for temporary power distribution and mates with Series 15 and 16 Insulgrip devices.

Thermal and Electrical Performance

The connector operates within its 400 A rating without exceeding temperature limits defined by UL94 HB flammability standards. Brass contacts maintain conductivity while the thermoplastic elastomer housing resists heat deformation under continuous load. No active cooling is required as the device relies on proper conductor sizing and secure double set screw termination to manage thermal rise in normal use.

Installation and Compatibility Features

A large raised alignment arrow simplifies mating orientation in low visibility conditions. The double set screw design provides mechanical termination without specialised crimping tools. UL Listed and cUL Listed compliance supports installation in NEMA Types 3R, 4X and 12 enclosures per ANSI/NFPA70 requirements. The green colour coding identifies specific phase or grounding assignments on site.

Highlights

  • Rated 400 A for high-power distribution
  • Double set screw ensures secure conductor connection
  • Thermoplastic elastomer housing withstands demanding conditions
  • Compatible with Series 15 and 16 Insulgrip devices
  • UL Listed and cUL Listed for code compliance

Specifications

BrandHUBBELL WIRING DEVICE-KELLEMS
TypeWiring Devices

Questions about this item

How do I install the HBL400MGN connector and what is the most common mistake?

Strip the 2/0 to 4/0 AWG cable to the correct length, insert fully into the double set screw terminal, and tighten both screws securely; the step often missed is tightening the second set screw, which can leave the connection loose.

What maintenance or replacement will this 400 A male connector need over time?

Inspect the brass single cam contact and thermoplastic elastomer housing periodically for wear, corrosion, or cracking; replace the connector if the contact shows pitting or the housing is damaged, as no user-serviceable parts exist inside.

What is the first limit reached when running this connector at 400 A continuously?

The 600V AC or 250V DC voltage rating and the 400 A ampacity define the electrical limit; sustained operation at full rated current will hit the conductor temperature rise allowed by the UL94 HB flammability rating first.

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