Wengart Insulated Inline Splice Connector QMS-D3/0-1 (4-Pack), 3/0-6 AWG Wire Range, 600V Dual Rated for Copper and Aluminum Conductors, Pre-Filled with Oxide Inhibitor, UL Listed, Black

Professional-Grade Splicing for High-Amperage CircuitsWhen you're handling 200-amp service or heavy-duty sub-panels, your connections are only as strong as your connectors. Our 3/0 AWG Insulated Inline Splices provide a permanent, code-compliant alternative to messy split bolts and tape. This 4-pack is the complete solution for electricians and DIYers looking for a secure, professional finish on power distribution projects.Advanced 6061-T6 Aluminum Construction Crafted from high-tensile 6061-T6 aluminum, these connectors offer superior conductivity and mechanical strength. The AL9CU dual-rating means you can confidently transition from aluminum to copper without worrying about thermal expansion or corrosion—making them ideal for upgrading old service lines.Technical SpecificationsWire Range: 3/0 - 6 AWG (AL or CU)Quantity: 4-Pack Value SetMaterial: 6061-T6 Aluminum with Black Plastisol InsulationScrew Size: 7/32" Allen HexRatings: 600 Volts, 90°C (194°F)Certification: UL ListedFrequently Asked Questions (Addressing Installer Pain Points)Q: Is the oxide inhibitor pre-installed? A: Yes! Every connector comes pre-filled with a professional oxide inhibitor. This saves you an extra step on the job site and ensures your aluminum connections remain stable and oxidation-free from day one.Q: Does this fit into standard electrical gutters and tight boxes? A: Absolutely. We’ve optimized the slim-profile design to be less bulky than traditional split bolts. This makes them much easier to tuck into crowded panels or wire troughs while maintaining full dielectric insulation.Q: What tool do I need for a secure connection? A: You will need a standard 7/32" Allen wrench. We recommend using a torque wrench to meet the specific requirements marked on the connector, ensuring a safe, low-resistance splice that meets NEC standards.

• Extended Conductor Range (3/0-6 AWG): Engineered for stranded copper (Cu) or aluminum (Al) conductors from 3/0 down to 6 AWG. This dual-rated QMS-D3/0-1 connector is a technical component for secondary electrical distribution in residential and commercial systems.
• Pre-Loaded Oxide Inhibitor: Each entry port contains a pre-filled oxide inhibiting compound. This feature manages the contact requirements of aluminum-to-copper joints, supporting the technical specifications of the connection.
• Insulation Specifications: Encased in a black plastisol coating designed for 600V applications. The housing is rated for a maximum operating temperature of 90°C (194°F) and maintains its physical properties in cold environments down to -45°C (-49°F).
• High-Torque Requirements: To support the mechanical stability of the connection, follow the specified torque profiles: 110 in-lbs (6 AWG), 150 in-lbs (3-1 AWG), 180 in-lbs (1/0-2/0 AWG), and 250 in-lbs (3/0 AWG).
• Technical Installation Design: Features a required wire strip length of 44.0 mm and utilizes a 7/32" Allen hex screw for securement. Includes removable access plugs to seal unused entry ports in junction boxes or wireways.