Custom UL 891 Switchgear Manufacturing — 800A to 4000A
At DEI Power, we specialize in the design and manufacturing of UL 891-certified switchgear ranging from 800 amps to 4000 amps, tailored to the most demanding power distribution requirements.
Precision-built UL 891 switchgear you can count on
We specialize in the design and manufacturing of UL 891-certified switchgear ranging from 800 amps to 4000 amps, tailored to the most demanding power distribution requirements.
Whether you’re working in commercial construction, industrial retrofit, or high-density power environments like crypto mining, our switchgear is engineered to meet exact specifications, built to last, and compliant with the highest U.S. standards—including UL 891.
Specifications
Voltage & System Compatibility
We build UL 891 switchgear for a wide range of voltage systems and wiring configurations, including:
Standard Voltage Classes
120/208V (Low Voltage, Wye Configuration)
L480/277V (Industrial & Commercial Standard)
Up to 1000V for specialized and high-capacity systems
Wiring Types Supported
3 Phase / 4 Wire
1 Phase / 3 Wire
3 Phase / 3 Wire
Each assembly is UL 891 tested, carefully designed for your project’s load, layout, and environmental conditions.
Ampacity Range: 800A to 4000A
From light commercial to heavy industrial and utility-scale operations, we manufacture switchgear systems across the full ampacity spectrum:
800 Amp
1200 Amp
1600 Amp
2000 Amp
2500 Amp
3000 Amp
4000 Amp
All gear is fabricated with UL 891-listed materials, subjected to rigorous factory testing, and backed by decades of engineering experience.
Built to Precision
Engineered for your projects needs
Every switchboard we build is fully custom, built to match footprint limitations, integration needs, and service conditions. We offer:
Front and rear access designs
Flexible access options simplify installation, wiring, and maintenance in any switchgear configuration.
Top or bottom cable entry/exit
Adaptable entry and exit designs fit site constraints and streamline cable routing.
Draw-out or fixed breakers
Choose draw-out or fixed breakers for safe operation and simplified maintenance.
Main-Tie-Main, Main-Tie, and Split Bus configurations
Custom configurations enhance system redundancy, load management, and operational flexibility.
Interior or exterior-rated enclosures (NEMA 1, 3R, 12, etc.)
Durable NEMA-rated enclosures ensure protection in both indoor and outdoor environments.
Full coordination with gen-sets, ATS, and load banks
Integrated coordination delivers power control with generators, transfer switches, and load banks.
Built in the USA
Built in the USA and powered by years of experience
Our products are proudly designed and engineered in the United States. Because we don’t rely on overseas manufacturing, international tariffs don’t affect our pricing. This allows us to offer consistent, competitive prices while delivering top-quality, American-made solutions.
Applications
Applications We Serve
Commercial Buildings
Crypto Mining Operations
Industrial Facilities
Data Centers
Energy Infrastructure
Hospitals & Institutional Projects
Our engineering team brings over 30 years of real-world experience into every project, ensuring that every piece of UL 891 switchgear we produce is both technically sound and field-ready.
Contact Us
Power your project with custom manufactured UL 891 switchgear
If your project demands custom-built switchgear from 800A to 4000A, with compliance, reliability, and seamless integration—you’re in the right place. Contact DEI Power today to request a quote or start a technical consultation.
We’re proud of our hassle-free nation-wide shipping
Emergency and overnight shipping
We deliver California-manufactured switchgear with the quickest turnaround times in the industry. By keeping production local, we eliminate delays and ensure faster delivery statewide. Our streamlined process guarantees UL 891 certified low voltage switchgear arrives on schedule, ready for installation.
North America, Mexico & Canada
We ship across the U.S., Canada, and Mexico. Whether you’re in a metro area or remote location, our network ensures your heavy or high-value equipment moves quickly—without delays, customs issues, or added stress.