Eaton TP403MSB Square Outlet Box - 30.3 cu in
Part Number: TP403MSB
Quick Summary
Eaton TP403MSB square outlet box protects conduit terminations in industrial control panels. Installers often struggle with mismatched knockouts and time-consuming wiring in rugged environments. It meets NEC/CEC standards and UL-listed protection for steel square boxes in ordinary/non-hazardous locations, with clear area-classification guidance. The welded steel construction, MSB bracket, and factory knockouts streamline installation while reducing hardware diversity and stocking costs. This model is a versatile choice for electrical infrastructure in automation projects, delivering reliable performance in a compact 4-inch enclosure. Designed for harsh factory floors and crowded panels, it supports quick field modifications, matches standard covers, and helps ensure compliance during audits.
Product Information
Extended Description
TP403MSB Eaton: Eaton Crouse-Hinds series Square Outlet Box, (2) 1/2", (2) 1/2", (1) 3/4" E, 4", MSB, Conduit (no clamps), Welded, 2-1/8", Steel, (8) 1/2",(4) 1/2", (1) 3/4" E, 30.3 cubic inch capacity
Product Name
Eaton Crouse-Hinds series square outlet box
Catalog Number
TP403MSB
UPC
662279019673
Product Length/Depth
4 in
Product Height
2.13 in
Product Width
4 in
Product Weight
0.95 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
Conduit (no clamps)
Bracket style
MSB
Construction
Welded
Side knockouts
(8) 1/2 in, (4) 1/2 in, (1) 3/4 in E
Bottom Knockouts
(2) 1/2 in, (2) 1/2 in, (1) 3/4 in E
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 TP403MSB is a 4-inch square steel outlet box with a 30.3 cubic inch capacity, providing ample space for conductors and terminations. This larger interior reduces crowding and simplifies wiring, delivering improved reliability and easier inspections. It is ideal for industrial control panels and automation enclosures where space is at a premium and NEC/CEC compliance matters. Conduit entries are designed with side and bottom knockouts and a Conduit (no clamps) configuration, enabling fast, flexible terminations. The layout supports standard conduit patterns and minimizes field modification time, reducing labor costs on large panel builds and allowing more predictable install schedules. Constructed from welded steel and weighing about 0.95 lb, the enclosure offers rugged durability that withstands industrial environments and protects wiring over the life of the installation. With an area classification of Ordinary/Non-Hazardous Locations and NEC/CEC standards, it supports safe operation and audit-ready documentation. UL certification for steel square boxes in the US and Canada further backs regulatory compliance, ensuring design conformity across multi-site deployments. Compatibility with standard 4-inch square box accessories and covers, along with the MSB mounting bracket, simplifies procurement and reduces part variety. Its compact 2-1/8 inch depth and standard knockouts align with common wiring practices, enabling straightforward retrofits and scalable expansions in automation infrastructure.
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FAQs
The TP403MSB excels in industrial control panels and automation enclosures where reliable conduit terminations are needed in a compact 4-inch square box. Its 30.3 cubic inch interior supports multiple conductors and splices, while the MSB bracket simplifies mounting in tight electrical infrastructure environments. It is particularly valuable for projects prioritizing NEC/CEC compliance and durable steel construction in ordinary locations.
This box features side knockouts: eight 1/2 in, four 1/2 in, and one 3/4 in E; and bottom knockouts: two 1/2 in, two 1/2 in, and one 3/4 in E. The Conduit (no clamps) design accommodates flexible conduit routing, speeds field terminations, and reduces the need for clamps and adapters, improving wiring density and consistency across panel builds.
Yes. The TP403MSB is designed to NEC/CEC standards and is UL-listed for steel square boxes used in ordinary/non-hazardous locations. This combination supports regulatory compliance, safer installations, and smoother audits across North American facilities.
Welded construction provides structural integrity under typical industrial conditions, while the MSB bracket enables straightforward surface mounting. The boxed design, with standard knockouts and no clamps requirement, reduces hardware diversity and minimizes service downtime during field modifications, leading to faster project completion and lower total cost of ownership.
Automation and electrical infrastructure projects that demand durable, space-efficient terminations benefit most. The 4-inch steel square box supports control panels, process automation enclosures, and machine wiring where reliable terminations, clear area classification, and regulatory compliance are essential for long-term performance and safer maintenance.