Eaton TP431MSB Square Outlet Box - 4 in Steel, NEC/CEC
Part Number: TP431MSB
Quick Summary
Eaton Crouse-Hinds square outlet box provides rugged enclosure for 4-inch electrical connections in industrial control panels. Field installations often stall due to nonstandard knockouts and mounting constraints, making fast, code-compliant wiring essential. This box meets NEC/CEC standards and is suitable for Ordinary/Non-Hazardous locations, with UL certification documentation available to support audit readiness. The welded steel construction and MSB bracket design deliver long-term durability while maintaining a compact footprint. Paired with AC/MC clamps and standardized knockouts, it enables rapid wiring, reduces field rework, and improves panel reliability in harsh environments.
Product Information
Extended Description
TP431MSB Eaton: Eaton Crouse-Hinds series Square Outlet Box, (1) 1/2", 4", MSB, 4, AC/MC clamps, Welded, 2-1/8", Steel, (4) 1/2", (2) 1/2", (1) 3/4" E, 30.3 cubic inch capacity
Product Name
Eaton Crouse-Hinds series square outlet box
Catalog Number
TP431MSB
UPC
662279019024
Product Length/Depth
4 in
Product Height
2.13 in
Product Width
4 in
Product Weight
0.91 lb
Area classification
Ordinary/Non-Hazardous Locations
Standards type
NEC/CEC
Box size
4"
Capacity
30.3 cubic in
Depth
2-1/8"
Conduit/cable
AC/MC clamps
Bracket style
MSB
Construction
Welded
Side knockouts
(4) 1/2 in, (2) 1/2 in, (1) 3/4 in E
Bottom Knockouts
(1) 1/2 in
Cable knockouts
4
Material
Steel
Crouse-Hinds series 4-Inch Steel Square Boxes and Covers catalog page
4-Inch Steel Square Outlet Boxes, Covers, Extension Rings UL certification
4-Inch Steel Square Outlet Boxes, Covers, Extension Rings UL certification
Steel Outlet Boxes for Electrical Systems
Steel Outlet Boxes for Electrical Systems
The TP431MSB uses a 4-inch square steel box with welded construction, delivering a rugged enclosure that stands up to demanding industrial environments and reduces field failure risks. This feature translates to increased panel reliability and longer service life, especially in manufacturing lines and process control cabinets where vibrations and dust are common. The 30.3 cubic inch capacity paired with four side knockouts and a bottom knockout provides flexible wiring routes for conductors and connectors, minimizing the need for field modifications and adapters. Included AC/MC clamps accelerate wiring and terminate conductors securely, lowering installation time and labor costs. The MSB bracket style supports stable mounting within standard control panels, while the 2-1/8 inch depth and 4 inch box size ensure a compact footprint in tight enclosures. Compliance with NEC/CEC standards and Ordinary/Non-Hazardous location classification reduces regulatory risk and simplifies audits. This steel square box is compatible with standard enclosure architectures and supports quick upgrades to existing systems, delivering predictable, repeatable installation outcomes.
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FAQs
TP431MSB is designed for straightforward field installs. Use the four side knockouts and the bottom knockout to route AC/MC cables, and utilize the included AC/MC clamps for secure terminations. The welded steel construction and MSB bracket support reliable mounting in panels, reducing the need for additional hardware. Ensure compliance with NEC/CEC requirements during wiring and enclosure assembly.
Yes. TP431MSB is designed for Ordinary/Non-Hazardous locations and aligns with NEC/CEC standards. Documentation for UL certification is available to support compliance audits. This makes it appropriate for standard industrial control panels, junction boxes, and equipment housings where hazardous location ratings are not required.
The box measures 4 inches by 4 inches with a depth of 2-1/8 inches and a weight of approximately 0.91 lb. It provides a 30.3 cubic inch capacity, with four side knockouts and one bottom knockout to accommodate multiple conduit entries, plus four cable knockouts for wiring flexibility.
Yes. The TP431MSB includes AC/MC clamps for conduit entries and a welded construction with an MSB bracket style for secure mounting. This helps reduce the number of extra components required on site and speeds up the installation process in control panels and electrical enclosures.
Official documentation includes Eaton’s Crouse-Hinds steel square boxes catalog page, UL certification reports, and the steel outlet boxes specification guide. You can access the product PDF at Eaton’s site and UL pages linked from the catalog pages to support compliance, maintenance, and procurement processes.