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

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.