Thomas & Betts 379-TB Bullet Hub Connector Conduit Fittings

Description:

The Thomas & Betts 379-TB Bullet Hub Connector is used to connect 4-inch rigid metal conduit (RMC) or intermediate metal conduit (IMC) to threadless electrical boxes and enclosures while providing a secure, rain-tight, dust-tight, and watertight connection. Commonly installed in industrial facilities, power distribution systems, substations, process plants, and commercial electrical installations, this insulated hub connector features a rugged aluminum and malleable iron construction with a nylon-insulated throat to protect conductor insulation. Maintenance teams and system integrators use this fitting for repair, retrofit, expansion, and replacement of conduit hub connections.

Applications:

The Thomas & Betts 379-TB is designed for terminating 4-inch threaded rigid metal conduit and IMC to electrical enclosures, junction boxes, switchgear, panelboards, and control cabinets. Its threaded hub design provides excellent grounding continuity and environmental sealing, making it ideal for commercial, industrial, utility, and hazardous location electrical installations.

Technical Specifications:

• Manufacturer Part Number (MPN): 379-TB
• Brand: Thomas & Betts (ABB) – T&B Rigid Fittings
• Product Type: Bullet Hub Connector / Insulated Hub Connector
• Trade Size: 4 in.
• Compatible Conduit: Rigid Metal Conduit (RMC), Intermediate Metal Conduit (IMC)
• Installation Type: Threaded Hub
• Material: Aluminum with Malleable Iron Components
• Finish: Electro-Zinc Plated / Chromate Coated
• Throat Type: Nylon Insulated
• Connection Type: Threaded
• Environmental Protection: Rain-Tight, Dust-Tight, Watertight (with neoprene O-ring)
• Temperature Rating: UL Listed 105°C
• Features: Tapered internal threads, recessed sealing ring, insulated throat to prevent conductor abrasion, extended-reach locknut for superior grounding continuity, suitable for hazardous locations when installed per code
• Standards: UL 514B (File E23018), CSA C22.2, NEMA FB-1, RoHS Compliant
• Typical Applications: Switchgear, Panelboards, Industrial Control Panels, Process Plants, Utility Power Distribution, Electrical Enclosures, Hazardous Locations, Commercial Buildings

Common Replacements:

• Thomas & Betts 377-TB
• Thomas & Betts 378-TB
• Thomas & Betts 380-TB