Southwire 640SI 4 Inch Steel Insulated Connector

Product Description

The SOUTHWIRE 640SI is a 4-inch steel self-sealing insulated connector designed for use in electrical conduit installations. This fitting provides a secure, insulated termination point where conduit meets an enclosure, panel, or junction box. The self-sealing design helps maintain the integrity of the connection under field conditions. At 17 pounds, this is a robust, trade-grade fitting suited for installation by licensed electricians on commercial and industrial projects where conduit termination integrity and insulation are required by code.

This connector is intended for use with 4-inch steel conduit systems in applications where an insulated throat is required to protect conductors from abrasion at the point of entry. Typical install scenarios include service entrances, panel feeders, and large conduit runs in commercial electrical systems. The self-sealing feature makes it well suited for installations where environmental sealing at the conduit termination is a priority.

Key Features

• 4-inch trade size fits standard 4-inch steel conduit
• Steel construction provides mechanical durability in demanding installation environments
• Self-sealing design aids in maintaining a sealed termination without additional fittings
• Insulated throat protects conductors from abrasion at enclosure entry points
• Heavyweight build at 17 pounds indicates robust, full-body steel construction

Compatibility

Designed as an OEM-style replacement and standard-fit connector for 4-inch steel conduit systems in commercial and industrial electrical installations.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements for conduit terminations and insulated fittings. De-energize all circuits and verify absence of voltage before working on any panel, enclosure, or conduit system. Ensure the connector is fully seated and secured to the enclosure knockout before pulling conductors through. Standard conduit installation hand tools and a knockout punch sized for the 4-inch trade size are typically required.

Technical Specifications

• Trade Size: 4 inches
• Material: Steel
• Weight: 17 pounds
• UPC: 75133823190

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: 640SI