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Yellow vinyl-insulated butt splice connector, cylindrical tin-plated copper body, 2.12 in long

3M

3M MV4BCX Butt Splice Connector 4 AWG Yellow Vinyl 600V

SKU CH-V3KF-QQKTP

Crimps 4 AWG copper wire with a tin-plated, brazed-barrel splice rated 600 V and 221 °F

  • TypeElectrical Connectors
  • Crimp termination ensures secure wire joints
  • Yellow vinyl insulation rated for 600 V operation
  • Brazed seam barrel resists pull-out forces
  • Tin-plated copper body meets CSA, UL and RoHS 2011/65/EU standards
  • Rated to 221 °F for demanding environments

Application Scope

The 3M MV4BCX butt splice connector joins two 4 AWG copper conductors using a crimp termination. It is built for installers and maintenance crews who need a reliable inline joint rated for up to 600 V in automotive, industrial or general electrical work. The vinyl insulation is colour-coded yellow for quick size identification on the job site.

Thermal and Electrical Behaviour

The connector carries a maximum operating temperature of 221 degrees Fahrenheit and a voltage rating of 600 V. Its tin-plated copper barrel and brazed seam provide a continuous conductive path with low contact resistance under normal load. Vinyl insulation maintains dielectric strength across the rated temperature range without melting or cracking during typical crimp cycles.

Included Features

Each unit is a single insulated barrel with no separate ferrules, heat-shrink tubing or installation tools supplied. The RoHS 2011/65/EU, UL and CSA markings confirm compliance with restricted-substance and safety standards for the intended markets. Tin plating on the copper body resists oxidation during storage and after crimping, preserving long-term conductivity.

Highlights

  • Crimp termination ensures secure wire joints
  • Yellow vinyl insulation rated for 600 V operation
  • Brazed seam barrel resists pull-out forces
  • Tin-plated copper body meets CSA, UL and RoHS 2011/65/EU standards
  • Rated to 221 °F for demanding environments

Specifications

Brand3M
TypeElectrical Connectors

Questions about this item

How do I crimp the 4 AWG butt splice and what step is often missed?

Strip the wire to the correct length, insert fully into the 0.28 in barrel, then crimp with a die matched to 4 AWG copper; the step often missed is verifying the wire reaches the centre stop before crimping.

What maintenance or replacement will the vinyl-insulated splice need later?

Inspect periodically for cracked vinyl insulation, corrosion on the tin-plated copper barrel, or overheating signs; replace the splice if insulation degrades above 221 Degrees F or if the crimp loosens.

What limit appears first during sustained high-current use?

The 221 Degrees F maximum operating temperature of the vinyl insulation is the first limit reached under sustained load, well before the 600 V voltage rating becomes a concern.

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