Switchboard Cabinet Manufacturer & Fabrication

DEI Power manufactures and fabricates code-compliant switchboard cabinets built for demanding commercial, industrial, and utility applications. From custom configurations to rapid fulfillment, our team helps contractors, engineers, and facility teams reduce delays, simplify approvals, and keep critical power projects moving with dependable U.S.-assembled solutions backed by engineering support.

Custom switchboard cabinet manufacturing facility

Our Switchboard Cabinet Manufacturer & Fabrication Services

Custom-built power distribution equipment, engineering support, and fast-turn supply solutions for critical electrical infrastructure projects.

Switchgear Supply

Specification-driven switchgear supply with documentation, enclosure guidance, and fulfillment support to reduce change orders, field adjustments, and schedule risk on critical power projects.

Custom Engineering

In-house engineering support for layouts, ratings, integration, and production-ready drawings that help ensure code compliance, installation efficiency, and long-term system performance.

Service Entrance Gear

Heavy-duty service entrance switchgear from 400A to 4000A, built with Siemens components and UL-listed assemblies for dependable commercial and industrial power distribution.

Low Voltage Gear

Flexible low-voltage switchgear lineups engineered for safe distribution, scalable integration, and easier maintenance across commercial, industrial, and infrastructure applications.

High Capacity Gear

High-amperage switchgear solutions designed for larger load demands, coordinated protection, and reliable operation in data centers, campuses, and industrial facilities.

Remote Power Panels

RPP solutions for high-density branch circuit distribution with scalable expansion, integrated monitoring, and service-friendly access for critical infrastructure environments.

Custom Fabrication

Built For Reliable Power Distribution

DEI Power fabricates switchboard cabinets and related power distribution equipment to match project-specific layouts, ratings, and compliance requirements. With in-house engineering, UL 891-certified manufacturing, and Siemens OEM capabilities, each solution is designed to streamline submittals, support efficient installation, and deliver dependable long-term performance for commercial, industrial, utility, and mission-critical facilities.

Engineered switchboard cabinet assembly
Trusted Performance

Project Results

Supporting critical power projects with compliant equipment, faster fulfillment, and dependable engineering coordination.

"Working with DEI Power has been a game-changer for our operations. Their custom panelboards are expertly built, and the in-house bus bar manufacturing…"

Scott L.
The DEI Power Difference

Why Choose DEI Power?

DEI Power combines manufacturing control, technical expertise, and responsive support for demanding power distribution projects.

Certified Quality

UL 891-certified switchgear and Siemens OEM approval support safe, code-compliant fabrication for critical applications.

Fast Fulfillment

In-house manufacturing and stocked inventory help reduce delays and keep time-sensitive projects moving.

Engineering Support

Configuration guidance, drawings, and specification review help minimize change orders and installation issues.

U.S. Manufacturing

Domestic assembly supports sourcing requirements, quality control, and dependable long-term project execution.

Meet The DEI Team

Experienced specialists behind every fabricated power solution.

DEI Power has spent more than a decade building reliable switchgear and switchboard cabinet solutions for commercial, industrial, and utility applications. Operating from a 50,000 sq. ft. facility in Ontario, California, the company combines manufacturing, assembly, and engineering support under one roof to improve quality control and shorten lead times. Over the years, DEI Power has expanded from switchgear manufacturing into a broader power distribution solutions provider, helping contractors, engineers, and facility teams navigate specifications, compliance, and delivery demands with greater confidence. Backed by UL 891-certified manufacturing standards and approved Siemens OEM status, the team focuses on precision, responsiveness, and dependable execution for projects where uptime, safety, and schedule certainty matter.

10+ YearsServing commercial, industrial, and utility power markets.
50,000 Sq. Ft.Ontario facility supporting fabrication, assembly, and fulfillment.
Nationwide ServiceSupporting projects across the United States.

Frequently Asked Questions

What does a switchboard cabinet manufacturer do?

A switchboard cabinet manufacturer designs, fabricates, assembles, and documents electrical distribution equipment used to control and distribute power safely. This typically includes enclosure selection, bus and breaker integration, layout coordination, compliance review, and production-ready submittals. DEI Power also supports specification guidance, engineering coordination, and fulfillment for commercial, industrial, utility, and mission-critical applications.

What types of switchboard cabinets can DEI Power fabricate?

Are your switchboard cabinets UL certified?

Do you offer custom engineering for switchboard fabrication?

How quickly can switchboard cabinets be shipped?

Do you manufacture switchboard cabinets in the USA?

Can you support large commercial or industrial power projects?

Do you provide nationwide service and project support?

Still Need Project Guidance?

Talk with our team about specs, lead times, and fabrication options.

Areas We Serve

DEI Power supports switchboard cabinet fabrication and delivery for customers across the United States.

Nationwide

Service Area

24/7 Phone Availability

Support Access

Ontario, CA

Fulfillment Hub

Need Delivery To Your Project Site?

Contact us to confirm specifications, shipping, and support availability.

Certified & Trusted

Awards and Recognition

UL 891 certification badge

UL 891 Certified

Certified for compliant low-voltage switchgear manufacturing.

Approved Siemens OEM badge

Siemens OEM

Approved OEM status for trusted component integration.

USA manufactured trust badge

USA Manufacturing

Domestic fabrication supporting sourcing compliance needs.

Start Your Switchboard Cabinet Project

Share your project requirements, ratings, and timeline, and our team will help you identify the right fabricated solution.

Contact Us Today

For immediate assistance, feel free to give us a direct call at (866) 773-8050. You can also send us a quick email at sales@deipower.com.