ABB - Installation Products 3-MBS - Three Gang Shallow Masonry Box, 47.3 Cubic Inches, 3-3/4 Inches Long x 5-1/2 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, Welded Construction, For use with Conduit
ABB - Installation Products

3-MBS

UPC: 781720005024


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Overview

The ABB 3-MBS Three Gang Shallow Masonry Box is a precision-engineered electrical enclosure designed for professional contractors and industrial applications requiring reliable conduit installations in masonry walls. Manufactured by ABB - Installation Products, this galvanized steel box combines robust welded construction with a compact shallow profile to deliver durable performance in demanding environments. With a spacious 47.3 cubic inch capacity, the 3-MBS accommodates complex wiring configurations while maintaining a shallow 2.5-inch depth—ideal for space-constrained installations where standard-depth boxes would be impractical. The box measures 3-3/4 inches long x 5-1/2 inches wide x 2-1/2 inches deep, optimizing wall space without sacrificing internal volume. Strategically positioned 1/2-inch and 3/4-inch concentric knockouts provide flexible conduit routing options, allowing for quick adaptation to various pipe sizes and installation requirements. The galvanized steel construction ensures superior corrosion resistance, making the 3-MBS suitable for both indoor masonry applications and outdoor environments where moisture exposure is a concern. This three-gang masonry box is engineered for use with standard electrical conduit systems, providing a secure mounting solution for junction boxes, switches, and other electrical components in commercial buildings, industrial facilities, and infrastructure projects. Its welded seams eliminate weak points common in stamped metal boxes, delivering long-term structural integrity under vibration and mechanical stress. The ABB 3-MBS is part of a comprehensive masonry box series that includes single-gang variants (1-MBS and 1-MB) for applications requiring different depth or capacity specifications.
  • 47.3 cubic inch capacity for complex wiring configurations
  • Shallow 2.5-inch depth (3-3/4" L x 5-1/2" W x 2-1/2" D) for space-constrained installations
  • 1/2-inch and 3/4-inch concentric knockouts for flexible conduit routing
  • Galvanized steel welded construction for corrosion resistance and structural integrity
  • Three-gang design for multiple electrical components in masonry walls

Specifications

Application
For use with conduit
Color
Silver
Connection Type
Conduit
Construction
Welded
Cubic Capacity
47.3 cu in
Knockouts
10
Material
Galvanized Steel
Material
Steel
Mounting Type
Masonry Box
Number Of Outlet
3
Series
ABB 3-MBS
Size
3-3/4 Inches Length x 5-1/2 Inches Width x 2-1/2 Inches Depth
Size
47.3 Cubic Inches, 3-3/4 Inches Long x 5-1/2 Inches Wide x 2-1/2 Inches Deep
Standard
UL E2969
Standard
UL E2969 / UL E2969
Type
Masonry Boxes
Package Dimensions (L x W x H)
0.01 IN x 0.01 IN x 0.01 IN
Package Dimensions (L x W x H)
0.0254 cm x 0.0254 cm x 0.0254 cm
Package Weight (Imperial)
1.240 L
Package Weight (Metric)
0.563 kg
Single Gang Masonry Box, 22.0 Cubic Inches, 3-3/4 Inches Long x 1-7/8 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, Welded Construction, For use with Conduit

1-MB

Single Gang Masonry Box, 22.0 Cubic Inches, 3-3/4 Inches Long x 1-7/8 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, Welded Construction, For use with Conduit
Thru-Wall Box for Concrete Block, 38 Cubic Inches, 3-11/16 Inches Height x 2-1/8 Inches Width x 5-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, For use with Concrete Block

CBTW 6

Thru-Wall Box for Concrete Block, 38 Cubic Inches, 3-11/16 Inches Height x 2-1/8 Inches Width x 5-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, For use with Concrete Block
Two Gang Shallow Masonry Box, 33 Cubic Inches, 3-3/4 Inches Long x 3-3/4 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, Welded Construction, For use with Conduit

2-MBS

Two Gang Shallow Masonry Box, 33 Cubic Inches, 3-3/4 Inches Long x 3-3/4 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Concentric Knockouts, Galvanized Steel, Welded Construction, For use with Conduit
Gangable Masonry Box, 79.0 Cubic Inches, 3-3/4 Inches Long x 9-3/16 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

GW 525 G

Gangable Masonry Box, 79.0 Cubic Inches, 3-3/4 Inches Long x 9-3/16 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit
Gangable Masonry Box, 94.8 Cubic Inches, 3-3/4 Inches Long x 11 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

GW 625 G

Gangable Masonry Box, 94.8 Cubic Inches, 3-3/4 Inches Long x 11 Inches Wide x 2-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit
Gangable Masonry Box, 134.0 Cubic Inches, 3-3/4 Inches Long x 11 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

GW 635 G

Gangable Masonry Box, 134.0 Cubic Inches, 3-3/4 Inches Long x 11 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit
Gangable Masonry Box, 93.5 Cubic Inches, 3-3/4 Inches Long x 7-3/8 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

GW 435 G

Gangable Masonry Box, 93.5 Cubic Inches, 3-3/4 Inches Long x 7-3/8 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit
Gangable Masonry Box, 111.7 Cubic Inches, 3-3/4 Inches Long x 9-3/16 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

GW 535 G

Gangable Masonry Box, 111.7 Cubic Inches, 3-3/4 Inches Long x 9-3/16 Inches Wide x 3-1/2 Inches Deep, 1/2 Inch and 3/4 Inch Knockouts, Pre-Galvanized Steel, For use with Conduit

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