Thomas & Betts 3940 Blackburn 3/4-Inch Malleable Iron Conduit Hub

Thomas & Betts 3940 Blackburn 3/4-Inch Malleable Iron Conduit Hub

The Thomas & Betts 3940 is a 3/4-Inch malleable iron conduit hub, part of the trusted Blackburn line of electrical connection products from Thomas & Betts. Built to provide a rugged, corrosion-resistant termination point for conduit entering an electrical enclosure, panelboard, or junction box, this hub helps electrical contractors maintain a clean, protected raceway system from source to load. The malleable iron construction offers the strength and durability required for demanding commercial, industrial, and institutional electrical installations, while its 3/4-Inch trade size matches standard 3/4-Inch conduit for straightforward integration into new or existing raceway runs. As a hub-style fitting, the 3940 is designed to seat securely against an enclosure wall, creating a stable mechanical connection that helps protect the conductors routed through the raceway system.

Key Features

• Trade Size: 3/4-Inch sizing matches standard 3/4-Inch rigid conduit, allowing installation without adapters or reducers in raceway systems built to that size.
• Durable Malleable Iron Construction: The 3940's malleable iron body resists corrosion and mechanical stress on the jobsite, offering long-term durability along with the ductility needed for a secure, properly seated fit.
• Conduit Hub Design: As a dedicated hub fitting, the 3940 creates a defined termination point where conduit enters an enclosure or box, helping installers achieve a clean, professional raceway transition and a mechanically sound connection.
• Enclosure-Ready Fit: The hub is designed to mate with a standard 3/4-Inch enclosure knockout, helping streamline installation at panelboards, boxes, and other equipment housings.
• Blackburn Product Line: Manufactured under the Blackburn brand by Thomas & Betts, the 3940 carries the reputation of a well-established name in electrical grounding and connection hardware.
• Field-Ready Design: Sized and constructed for use by electrical contractors, the 3940 is intended to integrate into standard conduit and enclosure installations using typical hand tools.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Conduit-to-Enclosure Connections
• Panelboard and Junction Box Wiring
• Commercial and Industrial Electrical Installations
• Raceway System Terminations
• New Construction and Retrofit Electrical Work

Why Thomas & Betts?

Thomas & Betts, home to the trusted Blackburn line, builds electrical connection products from rugged malleable iron for lasting performance in professional installations. The 3940 conduit hub reflects that same commitment to durable hardware that electrical contractors rely on for dependable raceway terminations. Choosing a Blackburn fitting from Thomas & Betts means specifying a component built to perform consistently across demanding commercial and industrial jobsites, where reliable conduit-to-enclosure connections are essential to a code-compliant installation.