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Blue twist-on wire connector, vinyl insulated, 0.39 in wide, 0.67 in high

3M

3M H-30-BIN Twist-On Wire Connector, Blue, 16 AWG Max, 300 V

SKU CH-Z579-MG0SH

Twist-on wire connector joins up to five copper conductors from 22 to 16 AWG, rated 300 V and 221 °F, with vinyl insulation and CSA/UL certification

  • TypeElectrical Connectors
  • Handles up to 16 AWG wires for versatile connections
  • Rated 300 V for safe low-voltage circuits
  • Vinyl insulation resists heat up to 221°F
  • UL Listed and CSA Certified for code compliance
  • Compact 0.39 in width fits tight junction boxes

Blue Twist-On Wire Connector

The 3M H-30-BIN twist-on connector joins solid or stranded copper wires in residential and light commercial electrical boxes. It accepts a minimum of five 22 AWG conductors and a maximum combination of one 14 AWG with one 18 AWG. The vinyl-insulated shell is rated for 300 volts and 221 degrees Fahrenheit. CSA certified and UL listed, it meets code requirements for standard junction-box splices.

Tool-Free Installation

Strip each conductor to the recommended length, align the ends, and twist the connector clockwise until the joint feels firm and no bare copper shows. The steel spring inside bites the wires as you turn, so no crimp tool is required. Common mistakes include stripping too much insulation, leaving loose strands outside the skirt, or exceeding the five-conductor limit, any of which can create a high-resistance joint that overheats.

Voltage and Wire-Range Limits

The 300-volt rating restricts use to low-voltage lighting, control circuits, and branch circuits not exceeding that potential. Wire combinations must stay within the 22 AWG minimum and the 14 AWG with 18 AWG maximum; larger gauges or more than five conductors will not fit the spring and void the listing. The connector is not suitable for aluminium conductors, high-temperature environments above 221 degrees F, or applications requiring a waterproof seal.

Highlights

  • Handles up to 16 AWG wires for versatile connections
  • Rated 300 V for safe low-voltage circuits
  • Vinyl insulation resists heat up to 221°F
  • UL Listed and CSA Certified for code compliance
  • Compact 0.39 in width fits tight junction boxes

Specifications

Brand3M
TypeElectrical Connectors

Questions about this item

How do I know the connector is seated correctly after twisting?

The connector is fully seated when the vinyl insulation covers all stripped copper and the twisted joint feels firm with no exposed wire visible.

What comes in the package and what else is needed?

The package contains only the blue twist-on connectors; you must supply copper wire between 22 AWG and 16 AWG and a wire stripper.

Which wire-gauge combination should I select for a 14 AWG and 18 AWG pair?

This model accepts a maximum combination of one 14 AWG with one 18 AWG, so it is the correct choice for that pairing.

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