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Heavy Duty Products, Switched Twist-Lock®, Industrial Grade, Accessories, Mechanical Interlock, 30A 600V AC, Single Conductor, Terminal Screws, Gray

By Hubbell Wiring Device-Kellems 


By Hubbell Wiring Device-Kellems
Catalog ID:  HBLMITL
Heavy Duty Products, Switched Twist-Lock®, Industrial Grade, Accessories, Mechanical Interlock, 30A 600V AC, Single Conductor, Terminal Screws, Gray

Hubbell offers the only mechanical interlock for Twist-Lock®. This new, unfused mechanical interlock for Watertight Safety-Shroud® Twist-Lock® integrates a watertight receptacle with a linked disconnect switch to provide a mechanically interlocked receptacle. This virtually eliminates the possibility of making or breaking the circuit while under load or making a casual or “lazy” connection. The switch cannot be turned ON until the plug is properly inserted and locked, and the plug cannot be removed until the switch is turned OFF. All these protective features are included in a compact Type 4X hose-directed water and corrosion resistant enclosure that allows for top, bottom or back feed options. The non-metallic enclosure is nonconductive, yet has an internal frame to assure ground continuity with metallic conduit. In addition, this interlock works with all Safety-Shroud Twist-Lock Plugs. The new unfused mechanical interlock for Watertight Safety-Shroud Twist-Lock can be locked out as a method of compliance with OSHA lockout/tagout regulations.

  • Unfused Mechanical Interlock for Watertight Safety-Shroud
  • Virtually Eliminates Possible Circuit Making or Breaking While Under Load
  • Compact, Corrosion Resistant Type 4X Non-metallic Enclosure
  • Molded Valox Resists Abuse, Corrosion and Enhances Safety
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Product Details


Color Gray
Item Type Safety-Shroud Enclosure
  • Electrical - Current Interrupting - Certified for current interrupting at full rated current and voltage
  • Electrical - Dielectric Voltage - Withstands 3,000V minimum
  • Electrical - Max. Working Voltage - 600V RMS
  • Electrical - Operations - Mechanical 10,000 cycles
  • Electrical 6,000 cycles
  • Environmental - Flammability - Meets UL 94V0 material classification
  • Environmental - Moisture Resistance - IP66 suitability
  • Environmental - Operating Temperature - Maximum continuous +75°C Minimum continuous -40°C
  • Environmental - UV Resistance - All exposed materials are UV stabilized
  • Mechanical - Impact Resistance - In accordance with UL 746C
  • Mechanical - Mounting - External full adjustable feet
  • Mechanical - Product Identification - Identification and ratings are part of the external label and receptacle face
  • Mechanical - Terminal Identification - In accordance with UL, CSA
Style For 20A and 30A Devices
Type Switched Enclosure
UPC 783585176802


Dimensions 11.44 in x 4.88 in x 4.19 in
Height 4.19 in
Length 11.44 in
Weight 3.65 lb
Width 4.88 in

Electrical Ratings

Dielectric Strength Withstands 3,000V minimum

Certifications and Compliance

Industry Standard(s)
  • CSA Certified TYPE 4, 4X and TYPE 12K Enclosure Rating
  • Listed to UL Standard
Nema Rating Type 4X