Orbit Industries 4RB-MKO-FB Steel Switch Box 4x4x1.5 in

Product Description

The ORBIT INDUSTRIES 4RB-MKO-FB is a steel electrical switch box designed for standard rough-in wiring applications in both residential and commercial construction. Fabricated from 16-gauge sheet steel, this square box measures 4 inches by 4 inches by 1.5 inches and ships with a welded-on bracket (MKO style) for direct stud or framing attachment. The box includes a factory-installed flat blank (FB) cover attachment surface and arrives with pre-knocked-out openings on the bottom for conduit or cable entry. Licensed electricians and electrical contractors install this box as part of a listed wiring assembly during rough-in framing stages.

The 4RB-MKO-FB fits into standard rough-in installations where a 4-inch square box is required. It is suited for residential framing walls and commercial light-construction partitions. The welded bracket simplifies positioning against framing members, and the combination of half-inch and three-quarter-inch knockouts accommodates the most common conduit trade sizes used in EMT and flexible conduit runs. The flat blank face allows for a standard mud-ring or device cover to be added at finish stage.

Key Features

• 16-gauge sheet steel construction for rigid, code-compliant enclosure strength
• Box dimensions: 4 inches x 4 inches x 1.5 inches (square box, standard depth)
• Bottom knockouts: three at 0.5 inches and two at 0.75 inches for common conduit sizes
• Welded MKO bracket included for direct mounting to framing members
• Flat blank (FB) cover surface for mud-ring or device plate installation at finish stage

Compatibility

Designed as an OEM-style replacement and standard rough-in solution for 4-inch square steel switch box applications in residential and commercial wiring installations.

Installation Notes

Installation should be performed by a licensed electrician in compliance with applicable NEC requirements for metal box fill and grounding. De-energize all circuits in the work area before securing wiring into the box. Ensure knockout openings are fitted with listed conduit connectors or cable clamps appropriate to the wiring method used. Do not exceed the box fill capacity as calculated per NEC Article 314.

Technical Specifications

• Box Dimensions: 4 inches x 4 inches x 1.5 inches
• Material: 16-gauge sheet steel
• Knockout Size (Bottom): Three at 0.5 inches, two at 0.75 inches
• Bracket Type: Welded MKO bracket
• Cover Surface: Flat blank (FB)
• UPC: 835243000841

Standard Information

• Brand: ORBIT INDUSTRIES
• Manufacturer Part Number: 4RB-MKO-FB