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Cast-aluminium back box, transparent finish, surface-mount feed-through design

Hubbell Incorporated

Hubbell Incorporated MB303W Pin & Sleeve Receptacle 30 A 3 Phase video accessory

SKU CH-3QTJ-J00ZG

A cast-aluminium back box rated 30 A and 600 V AC with a 3/4 inch hub, NEMA 4X and IP67 protection, operating from -40 °C to 75 °C

  • Product typeWiring Devices
  • Product colorTransparent
  • Rated for 30 A three-phase power delivery
  • NEMA 4X and IP67 rated for water and corrosion resistance
  • Cast aluminium housing withstands -40 °C to 75 °C operation
  • UL 746C impact and UL 94-5VA flammability ratings
  • Straight feed-through 3/4" NPT hub simplifies conduit installation

Hubbell 30 A Three-Phase Receptacle

The Hubbell MB303W is a 30 A pin-and-sleeve receptacle built for three-phase power distribution in industrial and commercial settings. Its cast-aluminium housing meets NEMA 4X and IP67 ratings, sealing out water, dust and corrosion. The device operates continuously from -40 °C to 75 °C and carries a UL94-5VA flammability rating. It suits facilities that need a durable, high-amperage connection point for heavy equipment.

Upgrade From Lower-Rated Or Non-Sealed Outlets

Replacing a lower-amperage or non-sealed receptacle with this 30 A unit adds capacity for larger motors, welders or distribution panels while gaining NEMA 4X and IP67 protection. The jump is worth it when the circuit is already rated for 30 A and the environment demands a watertight, corrosion-resistant enclosure that meets UL746C impact requirements. Installations staying below 30 A or in dry, protected areas will not need this level of sealing.

Sustained Load In Harsh Environments

Under continuous 30 A three-phase loads the cast-aluminium body dissipates heat across its full operating range of -40 °C to 75 °C without degradation. The NEMA 4X and IP67 seals maintain integrity during prolonged exposure to wash-downs, chemicals or outdoor weather. Feed-through wiring via the 3/4 inch hub keeps conductor runs cool and organised, supporting reliable operation in demanding production or outdoor applications.

How it compares

Measured against everything we stock in AV Accessories & Components, at today’s prices. Recalculated every night.

Price $70.99
Pricier than about 66% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameHUBBELL WIRING DEVICE-KELLEMS
Product typeWiring Devices
Product colorTransparent

Questions about this item

What size conduit hub does the MB303W back box accept for cable entry?

The back box accepts a 3/4 inch NPT hub, dead-end type, for straight feed-through cable entry.

Which step is often missed when surface-mounting this cast-aluminium enclosure?

Installers often forget to bond the metallic housing to the conduit ground system using the provided grounding provisions.

At what temperature extremes will the IP67 / NEMA 4X rating remain valid?

The enclosure is rated for continuous operation from -40 °C to 75 °C without loss of impact or ingress protection.

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