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Blue thermoplastic watertight mechanical interlock with locking handle

Hubbell Incorporated

Hubbell Incorporated HBL430MI7W Watertight Mechanical Interlock 30A 480V 3P4W

SKU CH-22RR-SAWGZ

A watertight mechanical interlock rated 30 A at 480 V AC with IP67 enclosure and OSHA Lockout/Tagout compatibility

  • Product typeWatertight Devices
  • Product colorBlue
  • Watertight enclosure rated IP67 for harsh indoor and outdoor use
  • Mechanical interlock prevents plug removal while switch is engaged for safety
  • 30 A, 480 V AC, three-phase, four-wire power rating
  • Thermoplastic housing with UV-stabilised components and stainless-steel screws
  • Compatible with 12 to 8 AWG cord sizes and plug 5Z941

Watertight Mechanical Interlock for Industrial Power

The Hubbell HBL430MI7W is a pin-and-sleeve mechanical interlock rated 30 A at 480 V AC three-phase. It combines a disconnect switch and receptacle in one non-metallic housing. The device accepts cord sizes from 12 to 8 AWG and carries a 15 hp motor rating.

Interlock Mechanism Prevents Live Plug Removal

The interlock physically blocks plug withdrawal while the switch is engaged, giving visual confirmation of disconnection. This design supports OSHA Lockout/Tagout procedures without a fuse or circuit breaker. The compatible plug number is 5Z941.

IP67 Enclosure Withstands Harsh Environments

The thermoplastic housing meets NEMA 4X and 12 ratings and uses UV-stabilised components. Stainless-steel 300-series screws resist corrosion across an operating range of -40 °C to +75 °C. Materials are UL94 V-0 and 5VA flammability certified.

How it compares

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

Price $1,099.99
Pricier than about 91% of the 3,838 comparable items (median $41.99).

Specifications

Product
Brand nameHubbell Wiring Device-Kellems
Model nameHBL430MI7 W
Product typeWatertight Devices
Product colorBlue

Questions about this item

What does the 30 A rating mean when the interlock is installed in a three-phase 480 V circuit?

The 30 A rating is the maximum continuous current each phase conductor can carry through the pin-and-sleeve contacts when the switch is closed, so a 15 hp three-phase motor load at 480 V stays within the device’s thermal limits.

How does the IP67 rating limit exposure in a wash-down environment?

IP67 means the thermoplastic housing withstands temporary immersion in water and completely excludes dust, so high-pressure wash-downs and outdoor weather do not reach the internal contacts or the stainless-steel screws.

What conduit or cable entry does the enclosure accept for 8 AWG conductors?

The hub accepts cord diameters that suit 12 to 8 AWG conductors, and the stainless-steel 300 series screws secure the wiring chamber while maintaining the NEMA 4X and 12 seal.

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